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Mon, 23 Feb 2026 03:20:10 -0700 Received: from che-lt-i67131.microchip.com (10.10.85.11) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Mon, 23 Feb 2026 03:20:05 -0700 From: Manikandan Muralidharan To: , , , , , , , , , , , CC: Subject: [PATCH v3 4/4] drm: atmel-hlcdc: add support for LVDS output formats Date: Mon, 23 Feb 2026 15:49:20 +0530 Message-ID: <20260223101920.284697-5-manikandan.m@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260223101920.284697-1-manikandan.m@microchip.com> References: <20260223101920.284697-1-manikandan.m@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add support for LVDS displays to handle format negotiation with the following bus formats: - RGB888_1X7X4_SPWG - RGB888_1X7X4_JEIDA - RGB666_1X7X3_SPWG - RGB666_1X18 Signed-off-by: Manikandan Muralidharan --- changes in v3: - Repharse commit message --- .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 38 +++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c index 73ac5ebbe121..919f9991a779 100644 --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c @@ -390,6 +390,42 @@ static int atmel_xlcdc_connector_output_dsi(struct drm_encoder *encoder, return supported_fmts; } +static int atmel_xlcdc_connector_output_lvds(struct drm_encoder *encoder, + struct drm_display_info *info) +{ + int j; + unsigned int supported_fmts = 0; + + switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) { + case 0: + break; + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: + case MEDIA_BUS_FMT_RGB666_1X18: + return ATMEL_HLCDC_RGB666_OUTPUT; + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: + return ATMEL_HLCDC_RGB888_OUTPUT; + default: + return -EINVAL; + } + + for (j = 0; j < info->num_bus_formats; j++) { + switch (info->bus_formats[j]) { + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: + case MEDIA_BUS_FMT_RGB666_1X18: + supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT; + break; + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: + supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT; + break; + default: + break; + } + } + return supported_fmts; +} + static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state) { struct drm_connector *connector = state->connector; @@ -408,6 +444,8 @@ static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state) */ if (encoder->encoder_type == DRM_MODE_ENCODER_DSI) return atmel_xlcdc_connector_output_dsi(encoder, info); + else if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS) + return atmel_xlcdc_connector_output_lvds(encoder, info); switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) { case 0: -- 2.25.1