From patchwork Wed Jun 7 21:49:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271388 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D9C0BC7EE25 for ; Wed, 7 Jun 2023 21:53:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5C9A410E54C; Wed, 7 Jun 2023 21:53:12 +0000 (UTC) Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by gabe.freedesktop.org (Postfix) with ESMTPS id 69BC210E12E for ; Wed, 7 Jun 2023 21:53:09 +0000 (UTC) Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-65292f79456so3704951b3a.2 for ; Wed, 07 Jun 2023 14:53:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1686174789; x=1688766789; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=7J6bms7QMm9w3IzcQHeVQuT7VvkTcEsATD8y00OpeXw=; b=lNOTHZUjf8JdjTbU6E6X/mqcY+Zwnqg/qRWUnY9Mwi3PCLRhThFa5YBIH0SWb6uJ1+ rFr2+HfY1hSDBAI2d85k+n6W6gF4wlv/tcnXPvydjr0FRk5O5EZevrutN13VURxdh3VR aQknU7zcndxDLitCgvK20aLmQb01W2KregYks= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686174789; x=1688766789; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7J6bms7QMm9w3IzcQHeVQuT7VvkTcEsATD8y00OpeXw=; b=kwa3fys+ssHCNMBUQ/W+kFv/7OS4228Pp1olpNDMBABjh1x8RCYyexQTea/1EfC4LT Phy4ecatVYTeiFmn2kD9ngI7ho7BEVoKB1mDNtiXMOdWccw//cw66bKr9yOyF6iUvorD P8qgepuhonbYJjAY5ra23ALetJI52eeyn6vp0RVOdIBmhPWtgA5A2ek3My1SAD6XQKD3 0mTHNK8RJmpG1yL240KYXjKNQx0ghFIdAIoUhIKDdk/DCsSvsj0btNO+NBB5bRcYRAXQ Acp8l+hW3uJteS9jwswUlgiASKHAJkzjblZn5tRV6bDltY2Yu81AFt2ZZlRe2cb7qbpe vDfQ== X-Gm-Message-State: AC+VfDwpNOkiAnv8DNYDM++LmYZJada/wNc1Ne5bQV+w68mye5svTwA8 SlnlBYWok4beMDJOLHVIkXjScm3WW01InnB6+Vw= X-Google-Smtp-Source: ACHHUZ6msq2zIZIoWR6/BNnd7gqzLUkkb+f55DYioqbBeFy7Kfz5MTf1YZEWIMbYfJuT7GP7UJVbsw== X-Received: by 2002:a05:6a21:328d:b0:10b:2214:7ab0 with SMTP id yt13-20020a056a21328d00b0010b22147ab0mr2370510pzb.21.1686174788778; Wed, 07 Jun 2023 14:53:08 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:08 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 01/10] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed touchscreens Date: Wed, 7 Jun 2023 14:49:23 -0700 Message-ID: <20230607144931.v2.1.Id68e30343bb1e11470582a9078b086176cfec46b@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" As talked about in the patch ("drm/panel: Add a way for other devices to follow panel state"), touchscreens that are connected to panels are generally expected to be power sequenced together with the panel they're attached to. Today, nothing provides information allowing you to find out that a touchscreen is connected to a panel. Let's add a phandle for this. The proerty is added to the generic touchscreen bindings and then enabled in the bindings for the i2c-hid backed devices. This can and should be added for other touchscreens in the future, but for now let's start small. Signed-off-by: Douglas Anderson Reviewed-by: Krzysztof Kozlowski --- Changes in v2: - Move the description to the generic touchscreen.yaml. - Update the desc to make it clearer it's only for integrated devices. Documentation/devicetree/bindings/input/elan,ekth6915.yaml | 5 +++++ .../devicetree/bindings/input/goodix,gt7375p.yaml | 5 +++++ Documentation/devicetree/bindings/input/hid-over-i2c.yaml | 2 ++ .../devicetree/bindings/input/touchscreen/touchscreen.yaml | 7 +++++++ 4 files changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml index 05e6f2df604c..3e2d216c6432 100644 --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml @@ -13,6 +13,9 @@ description: Supports the Elan eKTH6915 touchscreen controller. This touchscreen controller uses the i2c-hid protocol with a reset GPIO. +allOf: + - $ref: /schemas/input/touchscreen/touchscreen.yaml# + properties: compatible: items: @@ -24,6 +27,8 @@ properties: interrupts: maxItems: 1 + panel: true + reset-gpios: description: Reset GPIO; not all touchscreens using eKTH6915 hook this up. diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml index ce18d7dadae2..72212382d702 100644 --- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml +++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml @@ -14,6 +14,9 @@ description: This touchscreen uses the i2c-hid protocol but has some non-standard power sequencing required. +allOf: + - $ref: /schemas/input/touchscreen/touchscreen.yaml# + properties: compatible: oneOf: @@ -30,6 +33,8 @@ properties: interrupts: maxItems: 1 + panel: true + reset-gpios: true diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.yaml b/Documentation/devicetree/bindings/input/hid-over-i2c.yaml index 7156b08f7645..138caad96a29 100644 --- a/Documentation/devicetree/bindings/input/hid-over-i2c.yaml +++ b/Documentation/devicetree/bindings/input/hid-over-i2c.yaml @@ -44,6 +44,8 @@ properties: description: HID descriptor address $ref: /schemas/types.yaml#/definitions/uint32 + panel: true + post-power-on-delay-ms: description: Time required by the device after enabling its regulators or powering it on, before it is ready for communication. diff --git a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml index 895592da9626..431c13335c40 100644 --- a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml +++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml @@ -10,6 +10,13 @@ maintainers: - Dmitry Torokhov properties: + panel: + description: If this touchscreen is integrally connected to a panel, this + is a reference to that panel. The presence of this reference indicates + that the touchscreen should be power sequenced together with the panel + and that they may share power and/or reset signals. + $ref: /schemas/types.yaml#/definitions/phandle + touchscreen-min-x: description: minimum x coordinate reported $ref: /schemas/types.yaml#/definitions/uint32 From patchwork Wed Jun 7 21:49:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB940C7EE25 for ; Wed, 7 Jun 2023 21:53:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CABB310E54E; Wed, 7 Jun 2023 21:53:14 +0000 (UTC) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by gabe.freedesktop.org (Postfix) with ESMTPS id DF77310E54C for ; Wed, 7 Jun 2023 21:53:11 +0000 (UTC) Received: by mail-pf1-x435.google.com with SMTP id d2e1a72fcca58-6549df4321aso5413663b3a.2 for ; Wed, 07 Jun 2023 14:53:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1686174791; x=1688766791; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=hfUG9c2qlt8kTNqx7t/idPYkBIfLX/cfnxD2deWf3W8=; b=ayuR0NPMX0lCr649Ls3PcdaWJi3/pI5z6ekASxp9r2pXuUPRAKtIyY930QFx1kuFcE nOzUI88ocCNkotOwnkN5ZtWTSMimth7YMeld2HFSmbDacRlogFUCdDed5mPLGt0c4lYC KN5LqNcDew/hCZof0SBt6j5tLIkYGt873vkRE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686174791; x=1688766791; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=hfUG9c2qlt8kTNqx7t/idPYkBIfLX/cfnxD2deWf3W8=; b=GB9hz2gOHK2zkWL5VrajvwO+xjXv9orZv5WbbeSgluiEAhh1tengemHCBb2PbbKPV5 Y2jRNJk6LoQovQdhhIXhWPnAyQfdPcbRnoYTjDy1098zmqorXYJPS+zHxjxgx1pAD9YF lO+ITxM/6u9Augz1GzArWmb0au59PQzXFJNdzc1IRh+p+YouB8EJVGlgWIoYcemHBSsU SLsNMWmXzNzcQSMhR+a39M7lttOYhvJ6iGxdLopbZLkFLq0VOBOpt+IVf8CTL6T4LQi3 xIoGwBFYCNe2byYEqVhucbo4QCs42Iiug+qnXIeJa5QX2LoUlwIPhMJHpuAuDHRHn8ab AjfA== X-Gm-Message-State: AC+VfDwAyTt+FBAQhmi1oynXVISYtNAdZFARcr2zFrnVjs7XcakKnok/ bfipIteVudds/APjgoo8/kB68A== X-Google-Smtp-Source: ACHHUZ5vfibDCVUWE3Kynbnpu3siXIIB9yWFZZP0NY7g1SfK3F8RBOhQnS7yJNMmZRj3836EH4K2tg== X-Received: by 2002:a05:6a20:8f17:b0:107:1805:feea with SMTP id b23-20020a056a208f1700b001071805feeamr5073223pzk.37.1686174791064; Wed, 07 Jun 2023 14:53:11 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:10 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 02/10] drm/panel: Check for already prepared/enabled in drm_panel Date: Wed, 7 Jun 2023 14:49:24 -0700 Message-ID: <20230607144931.v2.2.I59b417d4c29151cc2eff053369ec4822b606f375@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In a whole pile of panel drivers, we have code to make the prepare/unprepare/enable/disable callbacks behave as no-ops if they've already been called. It's silly to have this code duplicated everywhere. Add it to the core instead so that we can eventually delete it from all the drivers. Note: to get some idea of the duplicated code, try: git grep 'if.*>prepared' -- drivers/gpu/drm/panel git grep 'if.*>enabled' -- drivers/gpu/drm/panel NOTE: arguably, the right thing to do here is actually to skip this patch and simply remove all the extra checks from the individual drivers. Perhaps the checks were needed at some point in time in the past but maybe they no longer are? Certainly as we continue transitioning over to "panel_bridge" then we expect there to be much less variety in how these calls are made. When we're called as part of the bridge chain, things should be pretty simple. In fact, there was some discussion in the past about these checks [1], including a discussion about whether the checks were needed and whether the calls ought to be refcounted. At the time, I decided not to mess with it because it felt too risky. Looking closer at it now, I'm fairly certain that nothing in the existing codebase is expecting these calls to be refcounted. The only real question is whether someone is already doing something to ensure prepare()/unprepare() match and enabled()/disable() match. I would say that, even if there is something else ensuring that things match, there's enough complexity that adding an extra bool and an extra double-check here is a good idea. Let's add a drm_warn() to let people know that it's considered a minor error to take advantage of drm_panel's double-checking but we'll still make things work fine. [1] https://lore.kernel.org/r/20210416153909.v4.27.I502f2a92ddd36c3d28d014dd75e170c2d405a0a5@changeid Acked-by: Neil Armstrong Signed-off-by: Douglas Anderson --- This has Neil's Ack and I could commit it to drm-misc-next, but for now I'm holding off to see where this series ends up. If the series ends up looking good we'll have to coordinate landing the various bits between the drm and the hid trees and the second drm patch in my series depends on this one. If my series implodes I'll land this one on its own. In any case, once this lands somewhere I'll take an AI to cleanup the panels. (no changes since v1) drivers/gpu/drm/drm_panel.c | 49 ++++++++++++++++++++++++++++++++----- include/drm/drm_panel.h | 14 +++++++++++ 2 files changed, 57 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index f634371c717a..4e1c4e42575b 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -105,11 +105,22 @@ EXPORT_SYMBOL(drm_panel_remove); */ int drm_panel_prepare(struct drm_panel *panel) { + int ret; + if (!panel) return -EINVAL; - if (panel->funcs && panel->funcs->prepare) - return panel->funcs->prepare(panel); + if (panel->prepared) { + dev_warn(panel->dev, "Skipping prepare of already prepared panel\n"); + return 0; + } + + if (panel->funcs && panel->funcs->prepare) { + ret = panel->funcs->prepare(panel); + if (ret < 0) + return ret; + } + panel->prepared = true; return 0; } @@ -128,11 +139,22 @@ EXPORT_SYMBOL(drm_panel_prepare); */ int drm_panel_unprepare(struct drm_panel *panel) { + int ret; + if (!panel) return -EINVAL; - if (panel->funcs && panel->funcs->unprepare) - return panel->funcs->unprepare(panel); + if (!panel->prepared) { + dev_warn(panel->dev, "Skipping unprepare of already unprepared panel\n"); + return 0; + } + + if (panel->funcs && panel->funcs->unprepare) { + ret = panel->funcs->unprepare(panel); + if (ret < 0) + return ret; + } + panel->prepared = false; return 0; } @@ -155,11 +177,17 @@ int drm_panel_enable(struct drm_panel *panel) if (!panel) return -EINVAL; + if (panel->enabled) { + dev_warn(panel->dev, "Skipping enable of already enabled panel\n"); + return 0; + } + if (panel->funcs && panel->funcs->enable) { ret = panel->funcs->enable(panel); if (ret < 0) return ret; } + panel->enabled = true; ret = backlight_enable(panel->backlight); if (ret < 0) @@ -187,13 +215,22 @@ int drm_panel_disable(struct drm_panel *panel) if (!panel) return -EINVAL; + if (!panel->enabled) { + dev_warn(panel->dev, "Skipping disable of already disabled panel\n"); + return 0; + } + ret = backlight_disable(panel->backlight); if (ret < 0) DRM_DEV_INFO(panel->dev, "failed to disable backlight: %d\n", ret); - if (panel->funcs && panel->funcs->disable) - return panel->funcs->disable(panel); + if (panel->funcs && panel->funcs->disable) { + ret = panel->funcs->disable(panel); + if (ret < 0) + return ret; + } + panel->enabled = false; return 0; } diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index 432fab2347eb..c6cf75909389 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -198,6 +198,20 @@ struct drm_panel { * the panel is powered up. */ bool prepare_prev_first; + + /** + * @prepared: + * + * If true then the panel has been prepared. + */ + bool prepared; + + /** + * @enabled: + * + * If true then the panel has been enabled. + */ + bool enabled; }; void drm_panel_init(struct drm_panel *panel, struct device *dev, From patchwork Wed Jun 7 21:49:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271390 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D7D79C83003 for ; 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Wed, 07 Jun 2023 14:53:12 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 03/10] drm/panel: Add a way for other devices to follow panel state Date: Wed, 7 Jun 2023 14:49:25 -0700 Message-ID: <20230607144931.v2.3.Icd5f96342d2242051c754364f4bee13ef2b986d4@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" These days, it's fairly common to see panels that have touchscreens attached to them. The panel and the touchscreen can somewhat be thought of as totally separate devices and, historically, this is how Linux has treated them. However, treating them as separate isn't necessarily the best way to model the two devices, it was just that there was no better way. Specifically, there is little practical reason to have the touchscreen powered on when the panel is turned off, but if we model the devices separately we have no way to keep the two devices' power states in sync with each other. The issue described above makes it sound as if the problem here is just about efficiency. We're wasting power keeping the touchscreen powered up when the screen is off. While that's true, the problem can go deeper. Specifically, hardware designers see that there's no reason to have the touchscreen on while the screen is off and then build hardware assuming that software would never turn the touchscreen on while the screen is off. In the very simplest case of hardware designs like this, the touchscreen and the panel share some power rails. In most cases, this turns out not to be terrible and is, again, just a little less efficient. Specifically if we tell Linux that the touchscreen and the panel are using the same rails then Linux will keep the rails on when _either_ device is turned on. That ends to work OK-ish, but now if you turn the panel off not only will the touchscreen remain powered, but the power rails for the panel itself won't be switched off, burning extra power. The above two inefficiencies are _extra_ minor when you consider the fact that laptops rarely spend much time with the screen off. The main use case would be when an external screen (and presumably a power supply) is attached. Unfortunately, it gets worse from here. On sc7180-trogdor-homestar, for instance, the display's TCON (timing controller) sometimes crashes if you don't power cycle it whenever you stop and restart the video stream (like during a modeset). The touchscreen keeping the power rails on causes real problems. One proposal in the homestar timeframe was to move the touchscreen to an always-on rail, dedicating the main power rail to the panel. That caused _different_ problems as talked about in commit 557e05fa9fdd ("HID: i2c-hid: goodix: Stop tying the reset line to the regulator"). The end result of all of this was to add an extra regulator to the board, increasing cost. Recently, Cong Yang posted a patch [1] where things are even worse. The panel and touch controller on that system seem even more intimately tied together and really can't be thought of separately. To address this issue, let's start allowing devices to register themselves as "panel followers". These devices will get called after a panel has been powered on and before a panel is powered off. This makes the panel the primary device in charge of the power state, which matches how userspace uses it. The panel follower API should be fairly straightforward to use. The current code assumes that panel followers are using device tree and have a "panel" property pointing to the panel to follow. More flexibility and non-DT implementations could be added as needed. Right now, panel followers can follow the prepare/unprepare functions. There could be arguments made that, instead, they should follow enable/disable. I've chosen prepare/unprepare for now since those functions are guaranteed to power up/power down the panel and it seems better to start the process earlier. A bit of explaining about why this is a roll-your-own API instead of using something more standard: 1. In standard APIs in Linux, parent devices are automatically powered on when a child needs power. Applying that here, it would mean that we'd force the panel on any time someone was listening to the touchscreen. That, unfortunately, would have broken homestar's need (if we hadn't changed the hardware, as per above) where the panel absolutely needs to be able to power cycle itself. While one could argue that homestar is broken hardware and we shouldn't have the API do backflips for it, _officially_ the eDP timing guidelines agree with homestar's needs and the panel power sequencing diagrams show power going off. It's nice to be able to support this. 2. We could, conceibably, try to add a new flag to device_link causing the parent to be in charge of power. Then we could at least use normal pm_runtime APIs. This sounds great, except that we run into problems with initial probe. As talked about in the later patch ("HID: i2c-hid: Support being a panel follower") the initial power on of a panel follower might need to do things (like add sub-devices) that aren't allowed in a runtime_resume function. The above complexities explain why this API isn't using common functions. That being said, this patch is very small and self-contained, so if someone was later able to adapt it to using more common APIs while solving the above issues then that could happen in the future. [1] 20230519032316.3464732-1-yangcong5@huaqin.corp-partner.google.com Signed-off-by: Douglas Anderson --- Changes in v2: - Add even more text to the commit message. - A few comment cleanups. drivers/gpu/drm/drm_panel.c | 151 +++++++++++++++++++++++++++++++++++- include/drm/drm_panel.h | 75 ++++++++++++++++++ 2 files changed, 222 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index 4e1c4e42575b..d103eda89f8e 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -58,6 +58,8 @@ void drm_panel_init(struct drm_panel *panel, struct device *dev, const struct drm_panel_funcs *funcs, int connector_type) { INIT_LIST_HEAD(&panel->list); + INIT_LIST_HEAD(&panel->followers); + mutex_init(&panel->follower_lock); panel->dev = dev; panel->funcs = funcs; panel->connector_type = connector_type; @@ -105,6 +107,7 @@ EXPORT_SYMBOL(drm_panel_remove); */ int drm_panel_prepare(struct drm_panel *panel) { + struct drm_panel_follower *follower; int ret; if (!panel) @@ -115,14 +118,27 @@ int drm_panel_prepare(struct drm_panel *panel) return 0; } + mutex_lock(&panel->follower_lock); + if (panel->funcs && panel->funcs->prepare) { ret = panel->funcs->prepare(panel); if (ret < 0) - return ret; + goto exit; } panel->prepared = true; - return 0; + list_for_each_entry(follower, &panel->followers, list) { + ret = follower->funcs->panel_prepared(follower); + if (ret < 0) + dev_info(panel->dev, "%ps failed: %d\n", + follower->funcs->panel_prepared, ret); + } + + ret = 0; +exit: + mutex_unlock(&panel->follower_lock); + + return ret; } EXPORT_SYMBOL(drm_panel_prepare); @@ -139,6 +155,7 @@ EXPORT_SYMBOL(drm_panel_prepare); */ int drm_panel_unprepare(struct drm_panel *panel) { + struct drm_panel_follower *follower; int ret; if (!panel) @@ -149,14 +166,27 @@ int drm_panel_unprepare(struct drm_panel *panel) return 0; } + mutex_lock(&panel->follower_lock); + + list_for_each_entry(follower, &panel->followers, list) { + ret = follower->funcs->panel_unpreparing(follower); + if (ret < 0) + dev_info(panel->dev, "%ps failed: %d\n", + follower->funcs->panel_unpreparing, ret); + } + if (panel->funcs && panel->funcs->unprepare) { ret = panel->funcs->unprepare(panel); if (ret < 0) - return ret; + goto exit; } panel->prepared = false; - return 0; + ret = 0; +exit: + mutex_unlock(&panel->follower_lock); + + return ret; } EXPORT_SYMBOL(drm_panel_unprepare); @@ -342,6 +372,119 @@ int of_drm_get_panel_orientation(const struct device_node *np, EXPORT_SYMBOL(of_drm_get_panel_orientation); #endif +/** + * drm_panel_add_follower() - Register something to follow panel state. + * @follower_dev: The 'struct device' for the follower. + * @follower: The panel follower descriptor for the follower. + * + * A panel follower is called right after preparing the panel and right before + * unpreparing the panel. It's primary intention is to power on an associated + * touchscreen, though it could be used for any similar devices. Multiple + * devices are allowed the follow the same panel. + * + * If a follower is added to a panel that's already been turned on, the + * follower's prepare callback is called right away. + * + * At the moment panels can only be followed on device tree enabled systems. + * The "panel" property of the follower points to the panel to be followed. + * + * Return: 0 or an error code. Note that -ENODEV means that we detected that + * follower_dev is not actually following a panel. The caller may + * choose to ignore this return value if following a panel is optional. + */ +int drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower) +{ + struct device_node *panel_np; + struct drm_panel *panel; + int ret; + + panel_np = of_parse_phandle(follower_dev->of_node, "panel", 0); + if (!panel_np) + return -ENODEV; + + panel = of_drm_find_panel(panel_np); + of_node_put(panel_np); + if (IS_ERR(panel)) + return PTR_ERR(panel); + + get_device(panel->dev); + follower->panel = panel; + + mutex_lock(&panel->follower_lock); + + list_add_tail(&follower->list, &panel->followers); + if (panel->prepared) { + ret = follower->funcs->panel_prepared(follower); + if (ret < 0) + dev_info(panel->dev, "%ps failed: %d\n", + follower->funcs->panel_prepared, ret); + } + + mutex_unlock(&panel->follower_lock); + + return 0; +} +EXPORT_SYMBOL(drm_panel_add_follower); + +/** + * drm_panel_remove_follower() - Reverse drm_panel_add_follower(). + * @follower: The panel follower descriptor for the follower. + * + * Undo drm_panel_add_follower(). This includes calling the follower's + * unprepare function if we're removed from a panel that's currently prepared. + * + * Return: 0 or an error code. + */ +void drm_panel_remove_follower(struct drm_panel_follower *follower) +{ + struct drm_panel *panel = follower->panel; + int ret; + + mutex_lock(&panel->follower_lock); + + if (panel->prepared) { + ret = follower->funcs->panel_unpreparing(follower); + if (ret < 0) + dev_info(panel->dev, "%ps failed: %d\n", + follower->funcs->panel_unpreparing, ret); + } + list_del_init(&follower->list); + + mutex_unlock(&panel->follower_lock); + + put_device(panel->dev); +} +EXPORT_SYMBOL(drm_panel_remove_follower); + +static void drm_panel_remove_follower_void(void *follower) +{ + drm_panel_remove_follower(follower); +} + +/** + * devm_drm_panel_add_follower() - devm version of drm_panel_add_follower() + * @follower_dev: The 'struct device' for the follower. + * @follower: The panel follower descriptor for the follower. + * + * Handles calling drm_panel_remove_follower() using devm on the follower_dev. + * + * Return: 0 or an error code. + */ +int devm_drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower) +{ + int ret; + + ret = drm_panel_add_follower(follower_dev, follower); + if (ret) + return ret; + + return devm_add_action_or_reset(follower_dev, + drm_panel_remove_follower_void, follower); +} +EXPORT_SYMBOL(devm_drm_panel_add_follower); + #if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE) /** * drm_panel_of_backlight - use backlight device node for backlight diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index c6cf75909389..e0a4d2f6f7fb 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -27,12 +27,14 @@ #include #include #include +#include struct backlight_device; struct dentry; struct device_node; struct drm_connector; struct drm_device; +struct drm_panel_follower; struct drm_panel; struct display_timing; @@ -144,6 +146,45 @@ struct drm_panel_funcs { void (*debugfs_init)(struct drm_panel *panel, struct dentry *root); }; +struct drm_panel_follower_funcs { + /** + * @panel_prepared: + * + * Called after the panel has been powered on. + */ + int (*panel_prepared)(struct drm_panel_follower *follower); + + /** + * @panel_unpreparing: + * + * Called before the panel is powered off. + */ + int (*panel_unpreparing)(struct drm_panel_follower *follower); +}; + +struct drm_panel_follower { + /** + * @funcs: + * + * Dependent device callbacks; should be initted by the caller. + */ + const struct drm_panel_follower_funcs *funcs; + + /** + * @list + * + * Used for linking into panel's list; set by drm_panel_add_follower(). + */ + struct list_head list; + + /** + * @panel + * + * The panel we're dependent on; set by drm_panel_add_follower(). + */ + struct drm_panel *panel; +}; + /** * struct drm_panel - DRM panel object */ @@ -189,6 +230,20 @@ struct drm_panel { */ struct list_head list; + /** + * @followers: + * + * A list of struct drm_panel_follower dependent on this panel. + */ + struct list_head followers; + + /** + * @followers_lock: + * + * Lock for followers list. + */ + struct mutex follower_lock; + /** * @prepare_prev_first: * @@ -246,6 +301,26 @@ static inline int of_drm_get_panel_orientation(const struct device_node *np, } #endif +#if defined(CONFIG_DRM_PANEL) +int drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower); +void drm_panel_remove_follower(struct drm_panel_follower *follower); +int devm_drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower); +#else +static inline int drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower) +{ + return -ENODEV; +} +static inline void drm_panel_remove_follower(struct drm_panel_follower *follower) { } +static inline int devm_drm_panel_add_follower(struct device *follower_dev, + struct drm_panel_follower *follower) +{ + return -ENODEV; +} +#endif + #if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \ (IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE))) int drm_panel_of_backlight(struct drm_panel *panel); From patchwork Wed Jun 7 21:49:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271391 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 08B94C7EE25 for ; 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Wed, 07 Jun 2023 14:53:15 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:15 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 04/10] of: property: fw_devlink: Add a devlink for panel followers Date: Wed, 7 Jun 2023 14:49:26 -0700 Message-ID: <20230607144931.v2.4.Ibf8e1342b5b7906279db2365aca45e6253857bb3@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Inform fw_devlink of the fact that a panel follower (like a touchscreen) is effectively a consumer of the panel from the purposes of fw_devlink. NOTE: this patch isn't required for correctness but instead optimizes probe order / helps avoid deferrals. Signed-off-by: Douglas Anderson Acked-by: Rob Herring --- Since this is so small, I'd presume it's OK for it to go through a DRM tree with the proper Ack. That being said, this patch is just an optimization and thus it could land completely separately from the rest and they could all meet up in mainline. Changes in v2: - ("Add a devlink for panel followers") new for v2. drivers/of/property.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/of/property.c b/drivers/of/property.c index ddc75cd50825..cf8dacf3e3b8 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1266,6 +1266,7 @@ DEFINE_SIMPLE_PROP(pwms, "pwms", "#pwm-cells") DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells") DEFINE_SIMPLE_PROP(leds, "leds", NULL) DEFINE_SIMPLE_PROP(backlight, "backlight", NULL) +DEFINE_SIMPLE_PROP(panel, "panel", NULL) DEFINE_SUFFIX_PROP(regulators, "-supply", NULL) DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells") @@ -1354,6 +1355,7 @@ static const struct supplier_bindings of_supplier_bindings[] = { { .parse_prop = parse_resets, }, { .parse_prop = parse_leds, }, { .parse_prop = parse_backlight, }, + { .parse_prop = parse_panel, }, { .parse_prop = parse_gpio_compat, }, { .parse_prop = parse_interrupts, }, { .parse_prop = parse_regulators, }, From patchwork Wed Jun 7 21:49:27 2023 Content-Type: text/plain; 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Wed, 07 Jun 2023 14:53:18 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:18 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 05/10] HID: i2c-hid: Switch to SYSTEM_SLEEP_PM_OPS() Date: Wed, 7 Jun 2023 14:49:27 -0700 Message-ID: <20230607144931.v2.5.Ib2a2865bd3c0b068432259dfc7d76cebcbb512be@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The SYSTEM_SLEEP_PM_OPS() allows us to get rid of '#ifdef CONFIG_PM_SLEEP', as talked about in commit 1a3c7bb08826 ("PM: core: Add new *_PM_OPS macros, deprecate old ones"). This change is expected to have no functional effect. Signed-off-by: Douglas Anderson --- (no changes since v1) drivers/hid/i2c-hid/i2c-hid-core.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index efbba0465eef..19d985c20a5c 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -1085,7 +1085,6 @@ void i2c_hid_core_shutdown(struct i2c_client *client) } EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown); -#ifdef CONFIG_PM_SLEEP static int i2c_hid_core_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); @@ -1138,10 +1137,9 @@ static int i2c_hid_core_resume(struct device *dev) return hid_driver_reset_resume(hid); } -#endif const struct dev_pm_ops i2c_hid_core_pm = { - SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_core_suspend, i2c_hid_core_resume) + SYSTEM_SLEEP_PM_OPS(i2c_hid_core_suspend, i2c_hid_core_resume) }; EXPORT_SYMBOL_GPL(i2c_hid_core_pm); From patchwork Wed Jun 7 21:49:28 2023 Content-Type: text/plain; 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Wed, 07 Jun 2023 14:53:21 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:20 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 06/10] HID: i2c-hid: Rearrange probe() to power things up later Date: Wed, 7 Jun 2023 14:49:28 -0700 Message-ID: <20230607144931.v2.6.Ifcc9b0a44895d164788966f9b9511fe094ca8cf9@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In a future patch, we want to change i2c-hid not to necessarily power up the touchscreen during probe. In preparation for that, rearrange the probe function so that we put as much stuff _before_ powering up the device as possible. This change is expected to have no functional effect. Signed-off-by: Douglas Anderson --- Changes in v2: - i2c_hid_core_initial_power_up() is now static. drivers/hid/i2c-hid/i2c-hid-core.c | 124 ++++++++++++++++++----------- 1 file changed, 77 insertions(+), 47 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index 19d985c20a5c..d29e6421ecba 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -855,7 +855,8 @@ static int i2c_hid_init_irq(struct i2c_client *client) irqflags = IRQF_TRIGGER_LOW; ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, - irqflags | IRQF_ONESHOT, client->name, ihid); + irqflags | IRQF_ONESHOT | IRQF_NO_AUTOEN, + client->name, ihid); if (ret < 0) { dev_warn(&client->dev, "Could not register for %s interrupt, irq = %d," @@ -940,6 +941,72 @@ static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid) ihid->ops->shutdown_tail(ihid->ops); } +/** + * i2c_hid_core_initial_power_up() - First time power up of the i2c-hid device. + * @ihid: The ihid object created during probe. + * + * This function is called at probe time. + * + * The initial power on is where we do some basic validation that the device + * exists, where we fetch the HID descriptor, and where we create the actual + * HID devices. + * + * Return: 0 or error code. + */ +static int i2c_hid_core_initial_power_up(struct i2c_hid *ihid) +{ + struct i2c_client *client = ihid->client; + struct hid_device *hid = ihid->hid; + int ret; + + ret = i2c_hid_core_power_up(ihid); + if (ret) + return ret; + + /* Make sure there is something at this address */ + ret = i2c_smbus_read_byte(client); + if (ret < 0) { + i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret); + ret = -ENXIO; + goto err; + } + + ret = i2c_hid_fetch_hid_descriptor(ihid); + if (ret < 0) { + dev_err(&client->dev, + "Failed to fetch the HID Descriptor\n"); + goto err; + } + + enable_irq(client->irq); + + hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); + hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); + hid->product = le16_to_cpu(ihid->hdesc.wProductID); + + hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor, + hid->product); + + snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", + client->name, (u16)hid->vendor, (u16)hid->product); + strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys)); + + ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product); + + ret = hid_add_device(hid); + if (ret) { + if (ret != -ENODEV) + hid_err(client, "can't add hid device: %d\n", ret); + goto err; + } + + return 0; + +err: + i2c_hid_core_power_down(ihid); + return ret; +} + int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, u16 hid_descriptor_address, u32 quirks) { @@ -966,16 +1033,10 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, if (!ihid) return -ENOMEM; - ihid->ops = ops; - - ret = i2c_hid_core_power_up(ihid); - if (ret) - return ret; - i2c_set_clientdata(client, ihid); + ihid->ops = ops; ihid->client = client; - ihid->wHIDDescRegister = cpu_to_le16(hid_descriptor_address); init_waitqueue_head(&ihid->wait); @@ -986,28 +1047,12 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, * real computation later. */ ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); if (ret < 0) - goto err_powered; - + return ret; device_enable_async_suspend(&client->dev); - /* Make sure there is something at this address */ - ret = i2c_smbus_read_byte(client); - if (ret < 0) { - i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret); - ret = -ENXIO; - goto err_powered; - } - - ret = i2c_hid_fetch_hid_descriptor(ihid); - if (ret < 0) { - dev_err(&client->dev, - "Failed to fetch the HID Descriptor\n"); - goto err_powered; - } - ret = i2c_hid_init_irq(client); if (ret < 0) - goto err_powered; + goto err_buffers_allocated; hid = hid_allocate_device(); if (IS_ERR(hid)) { @@ -1021,26 +1066,11 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, hid->ll_driver = &i2c_hid_ll_driver; hid->dev.parent = &client->dev; hid->bus = BUS_I2C; - hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); - hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); - hid->product = le16_to_cpu(ihid->hdesc.wProductID); - hid->initial_quirks = quirks; - hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor, - hid->product); - - snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", - client->name, (u16)hid->vendor, (u16)hid->product); - strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys)); - - ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product); - ret = hid_add_device(hid); - if (ret) { - if (ret != -ENODEV) - hid_err(client, "can't add hid device: %d\n", ret); + ret = i2c_hid_core_initial_power_up(ihid); + if (ret) goto err_mem_free; - } return 0; @@ -1050,9 +1080,9 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, err_irq: free_irq(client->irq, ihid); -err_powered: - i2c_hid_core_power_down(ihid); +err_buffers_allocated: i2c_hid_free_buffers(ihid); + return ret; } EXPORT_SYMBOL_GPL(i2c_hid_core_probe); @@ -1062,6 +1092,8 @@ void i2c_hid_core_remove(struct i2c_client *client) struct i2c_hid *ihid = i2c_get_clientdata(client); struct hid_device *hid; + i2c_hid_core_power_down(ihid); + hid = ihid->hid; hid_destroy_device(hid); @@ -1069,8 +1101,6 @@ void i2c_hid_core_remove(struct i2c_client *client) if (ihid->bufsize) i2c_hid_free_buffers(ihid); - - i2c_hid_core_power_down(ihid); } EXPORT_SYMBOL_GPL(i2c_hid_core_remove); From patchwork Wed Jun 7 21:49:29 2023 Content-Type: text/plain; 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Wed, 07 Jun 2023 14:53:23 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:22 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 07/10] HID: i2c-hid: Make suspend and resume into helper functions Date: Wed, 7 Jun 2023 14:49:29 -0700 Message-ID: <20230607144931.v2.7.I5c9894789b8b02f029bf266ae9b4f43c7907a173@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In a future patch we'd like to be able to call the current i2c-hid suspend and resume functions from times other than system suspend. Move the functions higher up in the file and have them take a "struct i2c_hid" to make this simpler. We'll then add tiny wrappers of the functions for use with system suspend. This change is expected to have no functional effect. Signed-off-by: Douglas Anderson --- (no changes since v1) drivers/hid/i2c-hid/i2c-hid-core.c | 98 +++++++++++++++++------------- 1 file changed, 56 insertions(+), 42 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index d29e6421ecba..fa8a1ca43d7f 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -941,6 +941,57 @@ static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid) ihid->ops->shutdown_tail(ihid->ops); } +static int i2c_hid_core_suspend(struct i2c_hid *ihid) +{ + struct i2c_client *client = ihid->client; + struct hid_device *hid = ihid->hid; + int ret; + + ret = hid_driver_suspend(hid, PMSG_SUSPEND); + if (ret < 0) + return ret; + + /* Save some power */ + i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP); + + disable_irq(client->irq); + + if (!device_may_wakeup(&client->dev)) + i2c_hid_core_power_down(ihid); + + return 0; +} + +static int i2c_hid_core_resume(struct i2c_hid *ihid) +{ + struct i2c_client *client = ihid->client; + struct hid_device *hid = ihid->hid; + int ret; + + if (!device_may_wakeup(&client->dev)) + i2c_hid_core_power_up(ihid); + + enable_irq(client->irq); + + /* Instead of resetting device, simply powers the device on. This + * solves "incomplete reports" on Raydium devices 2386:3118 and + * 2386:4B33 and fixes various SIS touchscreens no longer sending + * data after a suspend/resume. + * + * However some ALPS touchpads generate IRQ storm without reset, so + * let's still reset them here. + */ + if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) + ret = i2c_hid_hwreset(ihid); + else + ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON); + + if (ret) + return ret; + + return hid_driver_reset_resume(hid); +} + /** * i2c_hid_core_initial_power_up() - First time power up of the i2c-hid device. * @ihid: The ihid object created during probe. @@ -1115,61 +1166,24 @@ void i2c_hid_core_shutdown(struct i2c_client *client) } EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown); -static int i2c_hid_core_suspend(struct device *dev) +static int i2c_hid_core_pm_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct i2c_hid *ihid = i2c_get_clientdata(client); - struct hid_device *hid = ihid->hid; - int ret; - - ret = hid_driver_suspend(hid, PMSG_SUSPEND); - if (ret < 0) - return ret; - /* Save some power */ - i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP); - - disable_irq(client->irq); - - if (!device_may_wakeup(&client->dev)) - i2c_hid_core_power_down(ihid); - - return 0; + return i2c_hid_core_suspend(ihid); } -static int i2c_hid_core_resume(struct device *dev) +static int i2c_hid_core_pm_resume(struct device *dev) { - int ret; struct i2c_client *client = to_i2c_client(dev); struct i2c_hid *ihid = i2c_get_clientdata(client); - struct hid_device *hid = ihid->hid; - if (!device_may_wakeup(&client->dev)) - i2c_hid_core_power_up(ihid); - - enable_irq(client->irq); - - /* Instead of resetting device, simply powers the device on. This - * solves "incomplete reports" on Raydium devices 2386:3118 and - * 2386:4B33 and fixes various SIS touchscreens no longer sending - * data after a suspend/resume. - * - * However some ALPS touchpads generate IRQ storm without reset, so - * let's still reset them here. - */ - if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) - ret = i2c_hid_hwreset(ihid); - else - ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON); - - if (ret) - return ret; - - return hid_driver_reset_resume(hid); + return i2c_hid_core_resume(ihid); } const struct dev_pm_ops i2c_hid_core_pm = { - SYSTEM_SLEEP_PM_OPS(i2c_hid_core_suspend, i2c_hid_core_resume) + SYSTEM_SLEEP_PM_OPS(i2c_hid_core_pm_suspend, i2c_hid_core_pm_resume) }; EXPORT_SYMBOL_GPL(i2c_hid_core_pm); From patchwork Wed Jun 7 21:49:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271395 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B29D3C83003 for ; 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Wed, 07 Jun 2023 14:53:25 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 08/10] HID: i2c-hid: Support being a panel follower Date: Wed, 7 Jun 2023 14:49:30 -0700 Message-ID: <20230607144931.v2.8.Ib1a98309c455cd7e26b931c69993d4fba33bbe15@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" As talked about in the patch ("drm/panel: Add a way for other devices to follow panel state"), we really want to keep the power states of a touchscreen and the panel it's attached to in sync with each other. In that spirit, add support to i2c-hid to be a panel follower. This will let the i2c-hid driver get informed when the panel is powered on and off. From there we can match the i2c-hid device's power state to that of the panel. NOTE: this patch specifically _doesn't_ use pm_runtime to keep track of / manage the power state of the i2c-hid device, even though my first instinct said that would be the way to go. Specific problems with using pm_runtime(): * The initial power up couldn't happen in a runtime resume function since it create sub-devices and, apparently, that's not good to do in your resume function. * Managing our power state with pm_runtime meant fighting to make the right thing happen at system suspend to prevent the system from trying to resume us only to suspend us again. While this might be able to be solved, it added complexity. Overall the code without pm_runtime() ended up being smaller and easier to understand. Signed-off-by: Douglas Anderson --- Changes in v2: - i2c_hid_core_panel_prepared() and ..._unpreparing() are now static. drivers/hid/i2c-hid/i2c-hid-core.c | 82 +++++++++++++++++++++++++++++- 1 file changed, 81 insertions(+), 1 deletion(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index fa8a1ca43d7f..368db3ae612f 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -38,6 +38,8 @@ #include #include +#include + #include "../hid-ids.h" #include "i2c-hid.h" @@ -107,6 +109,8 @@ struct i2c_hid { struct mutex reset_lock; struct i2chid_ops *ops; + struct drm_panel_follower panel_follower; + bool is_panel_follower; }; static const struct i2c_hid_quirks { @@ -1058,6 +1062,34 @@ static int i2c_hid_core_initial_power_up(struct i2c_hid *ihid) return ret; } +static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower) +{ + struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower); + struct hid_device *hid = ihid->hid; + + /* + * hid->version is set on the first power up. If it's still zero then + * this is the first power on so we should perform initial power up + * steps. + */ + if (!hid->version) + return i2c_hid_core_initial_power_up(ihid); + + return i2c_hid_core_resume(ihid); +} + +static int i2c_hid_core_panel_unpreparing(struct drm_panel_follower *follower) +{ + struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower); + + return i2c_hid_core_suspend(ihid); +} + +static const struct drm_panel_follower_funcs i2c_hid_core_panel_follower_funcs = { + .panel_prepared = i2c_hid_core_panel_prepared, + .panel_unpreparing = i2c_hid_core_panel_unpreparing, +}; + int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, u16 hid_descriptor_address, u32 quirks) { @@ -1119,6 +1151,41 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, hid->bus = BUS_I2C; hid->initial_quirks = quirks; + /* + * See if we're following a panel. If drm_panel_add_follower() + * returns no error then we are. + */ + ihid->panel_follower.funcs = &i2c_hid_core_panel_follower_funcs; + ret = drm_panel_add_follower(&client->dev, &ihid->panel_follower); + if (!ret) { + /* We're a follower. That means we'll power things up later. */ + ihid->is_panel_follower = true; + + /* + * If we're not in control of our own power up/power down then + * we can't do the logic to manage wakeups. Give a warning if + * a user thought that was possible then force the capability + * off. + */ + if (device_can_wakeup(&client->dev)) { + dev_warn(&client->dev, "Can't wakeup if following panel\n"); + device_set_wakeup_capable(&client->dev, false); + } + + return 0; + } + + /* + * -ENODEV means that we're not following a panel, so any other error + * is a real problem (like -EPROBE_DEFER, -ENOMEM, ...). + */ + if (ret != -ENODEV) + goto err_mem_free; + + /* + * We're not following a panel. That's fine and means that we + * can power up right away. + */ ret = i2c_hid_core_initial_power_up(ihid); if (ret) goto err_mem_free; @@ -1143,7 +1210,14 @@ void i2c_hid_core_remove(struct i2c_client *client) struct i2c_hid *ihid = i2c_get_clientdata(client); struct hid_device *hid; - i2c_hid_core_power_down(ihid); + /* + * If we're a follower, the act of unfollowing will cause us to be + * powered down. Otherwise we need to manually do it. + */ + if (ihid->is_panel_follower) + drm_panel_remove_follower(&ihid->panel_follower); + else + i2c_hid_core_power_down(ihid); hid = ihid->hid; hid_destroy_device(hid); @@ -1171,6 +1245,9 @@ static int i2c_hid_core_pm_suspend(struct device *dev) struct i2c_client *client = to_i2c_client(dev); struct i2c_hid *ihid = i2c_get_clientdata(client); + if (ihid->is_panel_follower) + return 0; + return i2c_hid_core_suspend(ihid); } @@ -1179,6 +1256,9 @@ static int i2c_hid_core_pm_resume(struct device *dev) struct i2c_client *client = to_i2c_client(dev); struct i2c_hid *ihid = i2c_get_clientdata(client); + if (ihid->is_panel_follower) + return 0; + return i2c_hid_core_resume(ihid); } From patchwork Wed Jun 7 21:49:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271396 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9C3D5C7EE23 for ; Wed, 7 Jun 2023 21:53:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B7AA910E557; Wed, 7 Jun 2023 21:53:31 +0000 (UTC) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4705C10E557 for ; Wed, 7 Jun 2023 21:53:28 +0000 (UTC) Received: by mail-pf1-x435.google.com with SMTP id d2e1a72fcca58-6549df4321aso5413883b3a.2 for ; Wed, 07 Jun 2023 14:53:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1686174808; x=1688766808; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=/h3em+INtG/UUK+PVeHaRGBuj9ZpztA48bg5EQZ3MT0=; b=ZLvHLs5dOG1TPeYaxiFduJxz8FK7pBX6sxRTCg/aZwKCYFUfiL/X+PjM+I+zkpuBg+ V4fm2g2tewmOP3Nh+pNQNONSWT+TeKp9T5CjDmiibi6Ocgeaf+CVEG6fw3DEZI8uSS2W uF7dxpJegMiAAH0b2T/da7cBn3i7m7zQ37p8Y= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686174808; x=1688766808; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/h3em+INtG/UUK+PVeHaRGBuj9ZpztA48bg5EQZ3MT0=; b=mB8AfTXeJ6Xq1D+RepRFWR5BhBGix3/3h2XWumsHw3fYiqNiHZTcNpI8roi21yQ0l3 tuVIDtSn2witrNricQpuUu9pVyZftvL4aJbiqmJWiUCYkOQj0QzeJQbmhSit4IBumbfM 5sRUul0t4Lt5WG3BRgoBtHk6/imWKXSkYk7MdCuR2L1QwX+qC3R+3ZqlW3W/gZj+nu2k 3PlzPjUYD0W56GiKaLveh2PBRcCsFRFUnmR6r9H4IY9CV1q9CIHivYyLU2HkmUANVYU6 wn0D15QGk2pZ7A9O43as7UGSdOtke0cVvCgkYhhi9bRkNg9CR0skXxVxAdFcSuq3gzd/ bQmw== X-Gm-Message-State: AC+VfDxO/Qbrfqz1g0pwnrRZhxeSBhORDchnImKlhPHUs2rPtbFz9GZU sIYPpGmI7JUkyDgQTO0hIjBCOg== X-Google-Smtp-Source: ACHHUZ4Asvvqz3jZ11r912JJSVsXfmgd8cJYZY9r0G7ISeZLdnbvXRwq/3bqr9XWyidWFEy6QJDe3Q== X-Received: by 2002:a05:6a20:3d92:b0:118:b2e1:9adb with SMTP id s18-20020a056a203d9200b00118b2e19adbmr504121pzi.61.1686174807950; Wed, 07 Jun 2023 14:53:27 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:27 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 09/10] HID: i2c-hid: Do panel follower work on the system_wq Date: Wed, 7 Jun 2023 14:49:31 -0700 Message-ID: <20230607144931.v2.9.I962bb462ede779005341c49320740ed95810021d@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Turning on an i2c-hid device can be a slow process. This is why i2c-hid devices use PROBE_PREFER_ASYNCHRONOUS. Unfortunately, when we're a panel follower the i2c-hid power up sequence now blocks the power on of the panel. Let's fix that by scheduling the work on the system_wq. Signed-off-by: Douglas Anderson --- Changes in v2: - ihid_core_panel_prepare_work() is now static. - Improve documentation for smp_wmb(). drivers/hid/i2c-hid/i2c-hid-core.c | 50 +++++++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index 368db3ae612f..de1a0624be08 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -110,7 +110,9 @@ struct i2c_hid { struct i2chid_ops *ops; struct drm_panel_follower panel_follower; + struct work_struct panel_follower_prepare_work; bool is_panel_follower; + bool prepare_work_finished; }; static const struct i2c_hid_quirks { @@ -1062,10 +1064,12 @@ static int i2c_hid_core_initial_power_up(struct i2c_hid *ihid) return ret; } -static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower) +static void ihid_core_panel_prepare_work(struct work_struct *work) { - struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower); + struct i2c_hid *ihid = container_of(work, struct i2c_hid, + panel_follower_prepare_work); struct hid_device *hid = ihid->hid; + int ret; /* * hid->version is set on the first power up. If it's still zero then @@ -1073,15 +1077,52 @@ static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower) * steps. */ if (!hid->version) - return i2c_hid_core_initial_power_up(ihid); + ret = i2c_hid_core_initial_power_up(ihid); + else + ret = i2c_hid_core_resume(ihid); - return i2c_hid_core_resume(ihid); + if (ret) + dev_warn(&ihid->client->dev, "Power on failed: %d\n", ret); + else + WRITE_ONCE(ihid->prepare_work_finished, true); + + /* + * The work APIs provide a number of memory ordering guarantees + * including one that says that memory writes before schedule_work() + * are always visible to the work function, but they don't appear to + * guarantee that a write that happened in the work is visible after + * cancel_work_sync(). We'll add a write memory barrier here to match + * with i2c_hid_core_panel_unpreparing() to ensure that our write to + * prepare_work_finished is visible there. + */ + smp_wmb(); +} + +static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower) +{ + struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower); + + /* + * Powering on a touchscreen can be a slow process. Queue the work to + * the system workqueue so we don't block the panel's power up. + */ + WRITE_ONCE(ihid->prepare_work_finished, false); + schedule_work(&ihid->panel_follower_prepare_work); + + return 0; } static int i2c_hid_core_panel_unpreparing(struct drm_panel_follower *follower) { struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower); + cancel_work_sync(&ihid->panel_follower_prepare_work); + + /* Match with ihid_core_panel_prepare_work() */ + smp_rmb(); + if (!READ_ONCE(ihid->prepare_work_finished)) + return 0; + return i2c_hid_core_suspend(ihid); } @@ -1124,6 +1165,7 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops, init_waitqueue_head(&ihid->wait); mutex_init(&ihid->reset_lock); + INIT_WORK(&ihid->panel_follower_prepare_work, ihid_core_panel_prepare_work); /* we need to allocate the command buffer without knowing the maximum * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the From patchwork Wed Jun 7 21:49:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13271397 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7C07AC7EE25 for ; Wed, 7 Jun 2023 21:53:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 126EF10E559; Wed, 7 Jun 2023 21:53:34 +0000 (UTC) Received: from mail-pg1-x530.google.com (mail-pg1-x530.google.com [IPv6:2607:f8b0:4864:20::530]) by gabe.freedesktop.org (Postfix) with ESMTPS id CE57710E556 for ; Wed, 7 Jun 2023 21:53:30 +0000 (UTC) Received: by mail-pg1-x530.google.com with SMTP id 41be03b00d2f7-53f70f7c2d2so4104157a12.3 for ; Wed, 07 Jun 2023 14:53:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1686174810; x=1688766810; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=tXrYtUuCuWvkbV7L1gPu5v5c01AxUbntKP7msewlmBY=; b=VPtavFwrSLAnsChx0O9sOQZYBq1ojrqZEAOSN9K2H5D+oyhkPzKm1AqgA4P47Pf5oh O8BG7TF+uwHJXH1rO/mOL9Oga2y26MvCYhRwbSAF/7bdKs8d+B6F5pZXdFPrDqgi3EQP EzWvrRr+x12vJ7tl4U0Canch7ihXb8a8DBjks= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686174810; x=1688766810; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tXrYtUuCuWvkbV7L1gPu5v5c01AxUbntKP7msewlmBY=; b=lENxbXZdL/YJMv+eiJl19as9KeRwJffkg9THFB5J0OShyO15IogHmvbKX4NTimP7dg AQUQOPCpPMskp90Zs0Cb0Npk0Lr31LPEE3DdowXILoFsr+tSqdidIz1v2/d2TDZ6kKOb owxllcOItY0zn40ksgC+mLky8avccj0uy1ts8yrANeOc5I9BFb4LSQhpH3NQ/t8HVi1H h34AkY3smUaDDJz61UnEWmtQe2hzXr/8uXzOFexToE0oOTnsFcJBkpCdp8Rn0R/GW/s8 R37vho7+l4T+gQbhrlgQQg73q5LCLQp5a/ITcIwE2vhRAEgyeIwSHh4iY01j6yaGxiwp 77Bg== X-Gm-Message-State: AC+VfDzacbURVvwGvjRkk0n9h79FnXFFtBE9JZabS19blvVBpA+jn+V7 rA8JjNAvQAP43M6yo8Vtl90ZHA== X-Google-Smtp-Source: ACHHUZ5bFX6isITbSdGTCwRLcU7Gw3ebiIVWNaaFurz8NR3mHaewyosZt0XNEE7p9+xHiFDr1q+2Qg== X-Received: by 2002:a05:6a20:9384:b0:111:92ef:314e with SMTP id x4-20020a056a20938400b0011192ef314emr2361644pzh.35.1686174810186; Wed, 07 Jun 2023 14:53:30 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:34b2:b638:6b53:f6c2]) by smtp.gmail.com with ESMTPSA id j25-20020aa78d19000000b0065dd1e7c2c1sm1376486pfe.63.2023.06.07.14.53.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 14:53:29 -0700 (PDT) From: Douglas Anderson To: Jiri Kosina , Benjamin Tissoires , Bjorn Andersson , Konrad Dybcio , Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Subject: [PATCH v2 10/10] arm64: dts: qcom: sc7180: Link trogdor touchscreens to the panels Date: Wed, 7 Jun 2023 14:49:32 -0700 Message-ID: <20230607144931.v2.10.Ia06c340e3482563e6bfd3106ecd0d3139f173ca4@changeid> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <20230607215224.2067679-1-dianders@chromium.org> References: <20230607215224.2067679-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , devicetree@vger.kernel.org, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Dmitry Torokhov , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Morgan , linux-input@vger.kernel.org, hsinyi@google.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Let's provide the proper link from the touchscreen to the panel on trogdor devices where the touchscreen support it. This allows the OS to power sequence the touchscreen more properly. For the most part, this is just expected to marginally improve power consumption while the screen is off. However, in at least one trogdor model (wormdingler) it's suspected that this will fix some behavorial corner cases when the panel power cycles (like for a modeset) without the touchscreen power cycling. NOTE: some trogdor variants use touchscreens that don't (yet) support linking the touchscreen and the panel. Those variants are left alone. Signed-off-by: Douglas Anderson --- (no changes since v1) arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi | 1 + 6 files changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi index 8b8ea8af165d..b4f328d3e1f6 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi @@ -104,6 +104,7 @@ ap_ts: touchscreen@5d { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_LEVEL_LOW>; + panel = <&panel>; reset-gpios = <&tlmm 8 GPIO_ACTIVE_LOW>; vdd-supply = <&pp3300_ts>; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi index b3ba23a88a0b..88aeb415bd5b 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi @@ -116,6 +116,7 @@ ap_ts: touchscreen@14 { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_LEVEL_LOW>; + panel = <&panel>; reset-gpios = <&tlmm 8 GPIO_ACTIVE_LOW>; vdd-supply = <&pp3300_touch>; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi index 269007d73162..c65f18ea3e5c 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi @@ -43,6 +43,7 @@ ap_ts: touchscreen@10 { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_LEVEL_LOW>; + panel = <&panel>; post-power-on-delay-ms = <20>; hid-descr-addr = <0x0001>; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi index 6c5287bd27d6..d2aafd1ea672 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi @@ -102,6 +102,7 @@ ap_ts: touchscreen@10 { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_LEVEL_LOW>; + panel = <&panel>; post-power-on-delay-ms = <20>; hid-descr-addr = <0x0001>; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi index 8e7b42f843d4..0785873d1345 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi @@ -99,6 +99,7 @@ ap_ts: touchscreen@10 { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_LEVEL_LOW>; + panel = <&panel>; post-power-on-delay-ms = <20>; hid-descr-addr = <0x0001>; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi index 262d6691abd9..f70f5b42c845 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi @@ -154,6 +154,7 @@ ap_ts: touchscreen@1 { interrupt-parent = <&tlmm>; interrupts = <9 IRQ_TYPE_EDGE_FALLING>; + panel = <&panel>; post-power-on-delay-ms = <70>; hid-descr-addr = <0x0001>;