linux-kernel - [PATCH 1/3] drm: atmel-hlcdc: add support for LVDS encoder type

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Message-ID: <20241121092308.130328-1-manikandan.m@microchip.com>
Date: Thu, 21 Nov 2024 14:53:06 +0530
From: Manikandan Muralidharan <manikandan.m@...rochip.com>
To: <sam@...nborg.org>, <bbrezillon@...nel.org>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <lee@...nel.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <manikandan.m@...rochip.com>, Dharma Balasubiramani
	<dharma.b@...rochip.com>
Subject: [PATCH 1/3] drm: atmel-hlcdc: add support for LVDS encoder type

From: Dharma Balasubiramani <dharma.b@...rochip.com>

Add support for encoder type "DRM_MODE_ENCODER_LVDS" with the following
bus formats:
	- RGB888_1X7X4_SPWG
	- RGB888_1X7X4_JEIDA
	- RGB666_1X7X3_SPWG
	- RGB666_1X18

Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
[manikandan.m@...rochip.com: move modifications inside the
atmel_xlcdc_connector_output_lvds fn]
Signed-off-by: Manikandan Muralidharan <manikandan.m@...rochip.com>
---
 .../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 0f7ffb3ced20..0e709047369a 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -356,6 +356,42 @@ 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;
@@ -374,6 +410,8 @@ 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