From patchwork Thu Sep 9 21:00:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12483931 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 444F8C433FE for ; Thu, 9 Sep 2021 21:02:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3203D611C4 for ; Thu, 9 Sep 2021 21:02:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348586AbhIIVDa (ORCPT ); Thu, 9 Sep 2021 17:03:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347758AbhIIVDC (ORCPT ); Thu, 9 Sep 2021 17:03:02 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 777D4C0613D8 for ; Thu, 9 Sep 2021 14:01:51 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id f129so3122894pgc.1 for ; Thu, 09 Sep 2021 14:01:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=fQ7rEXKH6PKYYCF9RCSgRC1dHM+jJeiE+9nW9/qOOL0=; b=b9KjqzCWh2/EfBoAA8HBrHs8bXNNzNm+NzNt9q7i8P54HXlQjO98LIAglXIFn/8M+5 HHeBX9JJkKnlu3qncMlqN077Kam1mBTiSeOd+FDjc3sXPajCTTlN3YsADu3jQKTLf8b8 LDeqjQFPFRiXNJikwhpZYtl/6wRvFiAEpU0OE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=fQ7rEXKH6PKYYCF9RCSgRC1dHM+jJeiE+9nW9/qOOL0=; b=1ZbCYjcJCxgHGR8dMi1rgkBwFiExziri9yRiWSBG4T8B6e16WmvMiCsLMb9x9XkuPh yCqRuFFMWK33WyAGHm7JfNWcFce336zO+TOvGJD5ixzwdRHxVOzzce63I2OIq3E6oH1C e9TBjM2W6xwgGzM5Co0NBdSLoMmHlzuDRwSQa01DCjOobLiyMh55UcWmiSX0s9ABD3Xz cbVWkd8wALpAhhAVMORv4IFRlD/7uvcvc9qtik58MR6FxgDOs2Z1uKFnjYs5GcTrnUpE ifssrdEj4k0s93tgFKjprrJm86GnlvonflHQ5Kbwwgc4TgtjGkab+DGwEnoXXtUX73wa cBcQ== X-Gm-Message-State: AOAM530Xp08CF0ecUD+PmZ8HR9pGoc61rvujCaN5CkYLst9YuLM6RKRn ccOch6ulTPH3B7+tkkz9OVBaBg== X-Google-Smtp-Source: ABdhPJwGh2suI2ki2aDXJFXSximvkGNJLyoXYvnuBYKUMycv2CJkZWAufsfZqfHOf+j7bGYiObmEdg== X-Received: by 2002:a63:dd56:: with SMTP id g22mr4303762pgj.38.1631221310918; Thu, 09 Sep 2021 14:01:50 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:8da3:b0fb:4261:2c10]) by smtp.gmail.com with ESMTPSA id l143sm177069pfd.60.2021.09.09.14.01.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Sep 2021 14:01:50 -0700 (PDT) From: Douglas Anderson To: Thierry Reding , Rob Herring , Sam Ravnborg Cc: devicetree@vger.kernel.org, Maxime Ripard , Thomas Zimmermann , Linus W , Daniel Vetter , linux-arm-msm@vger.kernel.org, Steev Klimaszewski , Maarten Lankhorst , Bjorn Andersson , David Airlie , dri-devel@lists.freedesktop.org, Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH v4 15/15] drm/panel-edp: Implement generic "edp-panel"s probed by EDID Date: Thu, 9 Sep 2021 14:00:31 -0700 Message-Id: <20210909135838.v4.15.Id9c96cba4eba3e5ee519bfb09cd64b39f2490293@changeid> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog In-Reply-To: <20210909210032.465570-1-dianders@chromium.org> References: <20210909210032.465570-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org As discussed in the patch ("dt-bindings: drm/panel-simple: Introduce generic eDP panels") we can actually support probing eDP panels at runtime instead of hardcoding what panel is connected. Add support to the panel-edp driver for this. We'll implement a solution like this: * We'll read in two delays from the device tree that are used for powering up the panel the initial time (to read the EDID). * In the EDID we can find a 32-bit ID that identifies what panel we've found. From this ID we can look up the full set of delays. After this change we'll still need to add per-panel delays into the panel-simple driver but we will no longer need to specify exactly which panel is connected to which board in the device tree. Nicely, any panels that are only supported this way also don't need to hardcode mode data since it's guaranteed that we can get that through the EDID. This patch will seed the ID-to-delay table with a few panels that I have access to, many of which are on sc7180-trogdor devices. Signed-off-by: Douglas Anderson Acked-by: Sam Ravnborg --- Changes in v4: - decode_edid_id() => drm_edid_decode_panel_id() - drm_get_panel_id() => drm_edid_get_panel_id() - encode_edid_id() => drm_edid_encode_panel_id() - panel-simple-edp => panel-edp Changes in v3: - Add AUO B116XAN06.1 to table. - Add Sharp LQ116M1JW10 to table. - Adjust endianness of product ID. - Change init order to we power at the end. - Fallback to conservative delays if panel not recognized. - Generic "edp-panel" handled by the eDP panel driver now. - Rename delays more generically so they can be reused. Changes in v2: - Add "-ms" suffix to delays. - Don't support a "fallback" panel. Probed panels must be probed. - Not based on patch to copy "desc"--just allocate for probed panels. drivers/gpu/drm/panel/panel-edp.c | 216 ++++++++++++++++++++++++++++-- 1 file changed, 202 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c index 817c60858ef8..88e6a4cac2a4 100644 --- a/drivers/gpu/drm/panel/panel-edp.c +++ b/drivers/gpu/drm/panel/panel-edp.c @@ -189,6 +189,20 @@ struct panel_desc { struct panel_delay delay; }; +/** + * struct edp_panel_entry - Maps panel ID to delay / panel name. + */ +struct edp_panel_entry { + /** @panel_id: 32-bit ID for panel, encoded with drm_edid_encode_panel_id(). */ + u32 panel_id; + + /* @delay: The power sequencing delays needed for this panel. */ + const struct panel_delay *delay; + + /* @name: Name of this panel (for printing to logs). */ + const char *name; +}; + struct panel_edp { struct drm_panel base; bool enabled; @@ -559,8 +573,15 @@ static int panel_edp_get_modes(struct drm_panel *panel, pm_runtime_put_autosuspend(panel->dev); } - /* add hard-coded panel modes */ - num += panel_edp_get_non_edid_modes(p, connector); + /* + * Add hard-coded panel modes. Don't call this if there are no timings + * and no modes (the generic edp-panel case) because it will clobber + * the display_info that was already set by drm_add_edid_modes(). + */ + if (p->desc->num_timings || p->desc->num_modes) + num += panel_edp_get_non_edid_modes(p, connector); + else if (!num) + dev_warn(p->base.dev, "No display modes\n"); /* set up connector's "panel orientation" property */ drm_connector_set_panel_orientation(connector, p->orientation); @@ -641,6 +662,94 @@ static void panel_edp_parse_panel_timing_node(struct device *dev, dev_err(dev, "Reject override mode: No display_timing found\n"); } +static const struct edp_panel_entry *find_edp_panel(u32 panel_id); + +static int generic_edp_panel_probe(struct device *dev, struct panel_edp *panel) +{ + const struct edp_panel_entry *edp_panel; + struct panel_desc *desc; + u32 panel_id; + char vend[4]; + u16 product_id; + u32 reliable_ms = 0; + u32 absent_ms = 0; + int ret; + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + panel->desc = desc; + + /* + * Read the dts properties for the initial probe. These are used by + * the runtime resume code which will get called by the + * pm_runtime_get_sync() call below. + */ + of_property_read_u32(dev->of_node, "hpd-reliable-delay-ms", &reliable_ms); + desc->delay.hpd_reliable = reliable_ms; + of_property_read_u32(dev->of_node, "hpd-absent-delay-ms", &absent_ms); + desc->delay.hpd_reliable = absent_ms; + + /* Power the panel on so we can read the EDID */ + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "Couldn't power on panel to read EDID: %d\n", ret); + goto exit; + } + + panel_id = drm_edid_get_panel_id(panel->ddc); + if (!panel_id) { + dev_err(dev, "Couldn't identify panel via EDID\n"); + ret = -EIO; + goto exit; + } + drm_edid_decode_panel_id(panel_id, vend, &product_id); + + edp_panel = find_edp_panel(panel_id); + + /* + * We're using non-optimized timings and want it really obvious that + * someone needs to add an entry to the table, so we'll do a WARN_ON + * splat. + */ + if (WARN_ON(!edp_panel)) { + dev_warn(dev, + "Unknown panel %s %#06x, using conservative timings\n", + vend, product_id); + + /* + * It's highly likely that the panel will work if we use very + * conservative timings, so let's do that. We already know that + * the HPD-related delays must have worked since we got this + * far, so we really just need the "unprepare" / "enable" + * delays. We don't need "prepare_to_enable" since that + * overlaps the "enable" delay anyway. + * + * Nearly all panels have a "unprepare" delay of 500 ms though + * there are a few with 1000. Let's stick 2000 in just to be + * super conservative. + * + * An "enable" delay of 80 ms seems the most common, but we'll + * throw in 200 ms to be safe. + */ + desc->delay.unprepare = 2000; + desc->delay.enable = 200; + } else { + dev_info(dev, "Detected %s %s (%#06x)\n", + vend, edp_panel->name, product_id); + + /* Update the delay; everything else comes from EDID */ + desc->delay = *edp_panel->delay; + } + + ret = 0; +exit: + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return ret; +} + static int panel_edp_probe(struct device *dev, const struct panel_desc *desc, struct drm_dp_aux *aux) { @@ -698,12 +807,14 @@ static int panel_edp_probe(struct device *dev, const struct panel_desc *desc, if (!of_get_display_timing(dev->of_node, "panel-timing", &dt)) panel_edp_parse_panel_timing_node(dev, panel, &dt); - /* Catch common mistakes for panels. */ - if (desc->bpc != 6 && desc->bpc != 8 && desc->bpc != 10) - dev_warn(dev, "Expected bpc in {6,8,10} but got: %u\n", desc->bpc); - dev_set_drvdata(dev, panel); + drm_panel_init(&panel->base, dev, &panel_edp_funcs, DRM_MODE_CONNECTOR_eDP); + + err = drm_panel_of_backlight(&panel->base); + if (err) + goto err_finished_ddc_init; + /* * We use runtime PM for prepare / unprepare since those power the panel * on and off and those can be very slow operations. This is important @@ -714,11 +825,18 @@ static int panel_edp_probe(struct device *dev, const struct panel_desc *desc, pm_runtime_set_autosuspend_delay(dev, 1000); pm_runtime_use_autosuspend(dev); - drm_panel_init(&panel->base, dev, &panel_edp_funcs, DRM_MODE_CONNECTOR_eDP); - - err = drm_panel_of_backlight(&panel->base); - if (err) - goto disable_pm_runtime; + if (of_device_is_compatible(dev->of_node, "edp-panel")) { + err = generic_edp_panel_probe(dev, panel); + if (err) { + dev_err_probe(dev, err, + "Couldn't detect panel nor find a fallback\n"); + goto err_finished_pm_runtime; + } + /* generic_edp_panel_probe() replaces desc in the panel */ + desc = panel->desc; + } else if (desc->bpc != 6 && desc->bpc != 8 && desc->bpc != 10) { + dev_warn(dev, "Expected bpc in {6,8,10} but got: %u\n", desc->bpc); + } if (!panel->base.backlight && panel->aux) { pm_runtime_get_sync(dev); @@ -726,16 +844,17 @@ static int panel_edp_probe(struct device *dev, const struct panel_desc *desc, pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); if (err) - goto disable_pm_runtime; + goto err_finished_pm_runtime; } drm_panel_add(&panel->base); return 0; -disable_pm_runtime: +err_finished_pm_runtime: pm_runtime_dont_use_autosuspend(dev); pm_runtime_disable(dev); +err_finished_ddc_init: if (panel->ddc && (!panel->aux || panel->ddc != &panel->aux->ddc)) put_device(&panel->ddc->dev); @@ -1516,6 +1635,9 @@ static const struct panel_desc starry_kr122ea0sra = { static const struct of_device_id platform_of_match[] = { { + /* Must be first */ + .compatible = "edp-panel", + }, { .compatible = "auo,b101ean01", .data = &auo_b101ean01, }, { @@ -1605,11 +1727,77 @@ static const struct of_device_id platform_of_match[] = { }; MODULE_DEVICE_TABLE(of, platform_of_match); +static const struct panel_delay delay_200_500_p2e80 = { + .hpd_absent = 200, + .unprepare = 500, + .prepare_to_enable = 80, +}; + +static const struct panel_delay delay_200_500_p2e100 = { + .hpd_absent = 200, + .unprepare = 500, + .prepare_to_enable = 100, +}; + +static const struct panel_delay delay_200_500_e50 = { + .hpd_absent = 200, + .unprepare = 500, + .enable = 50, +}; + +#define EDP_PANEL_ENTRY(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _delay, _name) \ +{ \ + .name = _name, \ + .panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, \ + product_id), \ + .delay = _delay \ +} + +/* + * This table is used to figure out power sequencing delays for panels that + * are detected by EDID. Entries here may point to entries in the + * platform_of_match table (if a panel is listed in both places). + * + * Sort first by vendor, then by product ID. + */ +static const struct edp_panel_entry edp_panels[] = { + EDP_PANEL_ENTRY('A', 'U', 'O', 0x405c, &auo_b116xak01.delay, "B116XAK01"), + EDP_PANEL_ENTRY('A', 'U', 'O', 0x615c, &delay_200_500_e50, "B116XAN06.1"), + + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0786, &delay_200_500_p2e80, "NV116WHM-T01"), + EDP_PANEL_ENTRY('B', 'O', 'E', 0x07d1, &boe_nv133fhm_n61.delay, "NV133FHM-N61"), + EDP_PANEL_ENTRY('B', 'O', 'E', 0x082d, &boe_nv133fhm_n61.delay, "NV133FHM-N62"), + EDP_PANEL_ENTRY('B', 'O', 'E', 0x098d, &boe_nv110wtm_n61.delay, "NV110WTM-N61"), + + EDP_PANEL_ENTRY('C', 'M', 'N', 0x114c, &innolux_n116bca_ea1.delay, "N116BCA-EA1"), + + EDP_PANEL_ENTRY('K', 'D', 'B', 0x0624, &kingdisplay_kd116n21_30nv_a010.delay, "116N21-30NV-A010"), + + EDP_PANEL_ENTRY('S', 'H', 'P', 0x154c, &delay_200_500_p2e100, "LQ116M1JW10"), + + { /* sentinal */ } +}; + +static const struct edp_panel_entry *find_edp_panel(u32 panel_id) +{ + const struct edp_panel_entry *panel; + + if (!panel_id) + return NULL; + + for (panel = edp_panels; panel->panel_id; panel++) + if (panel->panel_id == panel_id) + return panel; + + return NULL; +} + static int panel_edp_platform_probe(struct platform_device *pdev) { const struct of_device_id *id; - id = of_match_node(platform_of_match, pdev->dev.of_node); + /* Skip one since "edp-panel" is only supported on DP AUX bus */ + id = of_match_node(platform_of_match + 1, pdev->dev.of_node); if (!id) return -ENODEV;