From patchwork Fri Sep 29 12:33:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Zink X-Patchwork-Id: 727800 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C88143C1D for ; Fri, 29 Sep 2023 12:34:10 +0000 (UTC) Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C75CA1BB for ; Fri, 29 Sep 2023 05:34:08 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qmCgq-0008Sf-GH; Fri, 29 Sep 2023 14:33:52 +0200 Received: from [2a0a:edc0:0:1101:1d::39] (helo=dude03.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1qmCgp-009oFT-HL; Fri, 29 Sep 2023 14:33:51 +0200 Received: from localhost ([::1] helo=dude03.red.stw.pengutronix.de) by dude03.red.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1qmCgp-009S7x-81; Fri, 29 Sep 2023 14:33:51 +0200 From: Johannes Zink Date: Fri, 29 Sep 2023 14:33:33 +0200 Subject: [PATCH v5 3/3] drm/panel-simple: allow LVDS format override Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20230523-simplepanel_support_nondefault_datamapping-v5-3-0d7928edafab@pengutronix.de> References: <20230523-simplepanel_support_nondefault_datamapping-v5-0-0d7928edafab@pengutronix.de> In-Reply-To: <20230523-simplepanel_support_nondefault_datamapping-v5-0-0d7928edafab@pengutronix.de> To: David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Laurent Pinchart , Thierry Reding , Neil Armstrong , Sam Ravnborg Cc: kernel test robot , Dan Carpenter , patchwork-jzi@pengutronix.de, kernel@pengutronix.de, Laurent Pinchart , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Johannes Zink X-Mailer: b4 0.12.2 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: j.zink@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: devicetree@vger.kernel.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Some panels support multiple LVDS data mapping formats, which can be used e.g. run displays on jeida-18 format when only 3 LVDS lanes are available. Add parsing of an optional data-mapping devicetree property, which also touches up the bits per color to match the bus format. Signed-off-by: Johannes Zink --- Changes: v4 -> v5: none v3 -> v4: - worked in Dan's feedback (thanks for reviewing my work): - return with a proper error in case the call to panel_simple_override_nondefault_lvds_datamapping() fails - drop the unneeded and ambiguous ret variable v2 -> v3: - worked in Laurent's review findings (thanks for reviewing my work): - extract fixing up the bus format to separate function - only call function on LVDS panels - fix typos found by Laurent - simplified error handling v1 -> v2: - fix missing unwind goto found by test robot Reported-by: kernel test robot Reported-by: Dan Carpenter Link: https://lore.kernel.org/r/202304160359.4LHmFOlU-lkp@intel.com/ --- drivers/gpu/drm/panel/panel-simple.c | 53 ++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index 857bc01591db..4195cf54934b 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -40,6 +40,7 @@ #include #include #include +#include /** * struct panel_desc - Describes a simple panel. @@ -549,6 +550,51 @@ static void panel_simple_parse_panel_timing_node(struct device *dev, dev_err(dev, "Reject override mode: No display_timing found\n"); } +static int panel_simple_override_nondefault_lvds_datamapping(struct device *dev, + struct panel_simple *panel) +{ + int ret, bpc; + + ret = drm_of_lvds_get_data_mapping(dev->of_node); + if (ret < 0) { + if (ret == -EINVAL) + dev_warn(dev, "Ignore invalid data-mapping property\n"); + + /* + * Ignore non-existing or malformatted property, fallback to + * default data-mapping, and return 0. + */ + return 0; + } + + switch (ret) { + default: + WARN_ON(1); + fallthrough; + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: + fallthrough; + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: + bpc = 8; + break; + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: + bpc = 6; + } + + if (panel->desc->bpc != bpc || panel->desc->bus_format != ret) { + struct panel_desc *override_desc; + + override_desc = devm_kmemdup(dev, panel->desc, sizeof(*panel->desc), GFP_KERNEL); + if (!override_desc) + return -ENOMEM; + + override_desc->bus_format = ret; + override_desc->bpc = bpc; + panel->desc = override_desc; + } + + return 0; +} + static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) { struct panel_simple *panel; @@ -601,6 +647,13 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) panel_simple_parse_panel_timing_node(dev, panel, &dt); } + if (desc->connector_type == DRM_MODE_CONNECTOR_LVDS) { + /* Optional data-mapping property for overriding bus format */ + err = panel_simple_override_nondefault_lvds_datamapping(dev, panel); + if (err) + goto free_ddc; + } + connector_type = desc->connector_type; /* Catch common mistakes for panels. */ switch (connector_type) {