From patchwork Sat Jun 19 10:40:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajeev Nandan X-Patchwork-Id: 12332909 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EBBDC2B9F4 for ; Sat, 19 Jun 2021 10:41:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4350C61222 for ; Sat, 19 Jun 2021 10:41:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231474AbhFSKna (ORCPT ); Sat, 19 Jun 2021 06:43:30 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:64758 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230430AbhFSKn3 (ORCPT ); Sat, 19 Jun 2021 06:43:29 -0400 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 19 Jun 2021 03:41:18 -0700 X-QCInternal: smtphost Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 19 Jun 2021 03:41:16 -0700 X-QCInternal: smtphost Received: from rajeevny-linux.qualcomm.com ([10.204.66.121]) by ironmsg01-blr.qualcomm.com with ESMTP; 19 Jun 2021 16:10:37 +0530 Received: by rajeevny-linux.qualcomm.com (Postfix, from userid 2363605) id E2C0321507; Sat, 19 Jun 2021 16:10:36 +0530 (IST) From: Rajeev Nandan To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org Cc: Rajeev Nandan , linux-kernel@vger.kernel.org, thierry.reding@gmail.com, sam@ravnborg.org, robdclark@gmail.com, dianders@chromium.org, lyude@redhat.com, jani.nikula@intel.com, robh@kernel.org, laurent.pinchart@ideasonboard.com, a.hajda@samsung.com, daniel.thompson@linaro.org, hoegsberg@chromium.org, abhinavk@codeaurora.org, seanpaul@chromium.org, kalyan_t@codeaurora.org, mkrishn@codeaurora.org Subject: [v7 3/5] drm/panel-simple: Support for delays between GPIO & regulator Date: Sat, 19 Jun 2021 16:10:28 +0530 Message-Id: <1624099230-20899-4-git-send-email-rajeevny@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1624099230-20899-1-git-send-email-rajeevny@codeaurora.org> References: <1624099230-20899-1-git-send-email-rajeevny@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Some panels datasheets may specify a delay between the enable GPIO and the regulator. Support this in panel-simple. Signed-off-by: Rajeev Nandan Reviewed-by: Douglas Anderson --- (no changes since v6) Changes in v4: - New Changes in v5: - Update description (Douglas) - Warn if "power_to_enable" or "disable_to_power_off" is non-zero and panel->enable_gpio is NULL (Douglas) Changes in v6: - Update warning message to make it more meaningful. (Douglas) drivers/gpu/drm/panel/panel-simple.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index 26555ec..86e5a45 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -133,6 +133,22 @@ struct panel_desc { unsigned int prepare_to_enable; /** + * @delay.power_to_enable: Time for the power to enable the display on. + * + * The time (in milliseconds) to wait after powering up the display + * before asserting its enable pin. + */ + unsigned int power_to_enable; + + /** + * @delay.disable_to_power_off: Time for the disable to power the display off. + * + * The time (in milliseconds) to wait before powering off the display + * after deasserting its enable pin. + */ + unsigned int disable_to_power_off; + + /** * @delay.enable: Time for the panel to display a valid frame. * * The time (in milliseconds) that it takes for the panel to @@ -347,6 +363,10 @@ static int panel_simple_suspend(struct device *dev) struct panel_simple *p = dev_get_drvdata(dev); gpiod_set_value_cansleep(p->enable_gpio, 0); + + if (p->desc->delay.disable_to_power_off) + msleep(p->desc->delay.disable_to_power_off); + regulator_disable(p->supply); p->unprepared_time = ktime_get(); @@ -407,6 +427,9 @@ static int panel_simple_prepare_once(struct panel_simple *p) return err; } + if (p->desc->delay.power_to_enable) + msleep(p->desc->delay.power_to_enable); + gpiod_set_value_cansleep(p->enable_gpio, 1); delay = p->desc->delay.prepare; @@ -782,6 +805,11 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc, break; } + if (!panel->enable_gpio && desc->delay.disable_to_power_off) + dev_warn(dev, "Need a delay after disabling panel GPIO, but a GPIO wasn't provided\n"); + if (!panel->enable_gpio && desc->delay.power_to_enable) + dev_warn(dev, "Need a delay before enabling panel GPIO, but a GPIO wasn't provided\n"); + dev_set_drvdata(dev, panel); /*