linux-kernel - [PATCH v2 3/3] drm: bridge: cdns-mhdp8546: Retrieve the pixel format and bpc based on bus format

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Date:   Wed, 18 Nov 2020 15:03:28 +0100
From:   Yuti Amonkar <yamonkar@...ence.com>
To:     <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <maxime@...no.tech>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <mark.rutland@....com>, <a.hajda@...sung.com>,
        <narmstrong@...libre.com>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...l.net>
CC:     <nsekhar@...com>, <jsarha@...com>, <tomi.valkeinen@...com>,
        <nikhil.nd@...com>, <mparab@...ence.com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>
Subject: [PATCH v2 3/3] drm: bridge: cdns-mhdp8546: Retrieve the pixel format and bpc based on bus format

Get the pixel format and bpc based on the output bus format
negotiated instead of hardcoding the values.

Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 82 +++++++++++++++----
 1 file changed, 64 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index d5e94bd74df1..e1f4bbd09816 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1512,24 +1512,8 @@ static int cdns_mhdp_get_modes(struct drm_connector *connector)
 
 	drm_connector_update_edid_property(connector, edid);
 	num_modes = drm_add_edid_modes(connector, edid);
-	kfree(edid);
 
-	/*
-	 * HACK: Warn about unsupported display formats until we deal
-	 *       with them correctly.
-	 */
-	if (connector->display_info.color_formats &&
-	    !(connector->display_info.color_formats &
-	      mhdp->display_fmt.color_format))
-		dev_warn(mhdp->dev,
-			 "%s: No supported color_format found (0x%08x)\n",
-			__func__, connector->display_info.color_formats);
-
-	if (connector->display_info.bpc &&
-	    connector->display_info.bpc < mhdp->display_fmt.bpc)
-		dev_warn(mhdp->dev, "%s: Display bpc only %d < %d\n",
-			 __func__, connector->display_info.bpc,
-			 mhdp->display_fmt.bpc);
+	kfree(edid);
 
 	return num_modes;
 }
@@ -1689,6 +1673,66 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge,
 	return 0;
 }
 
+static void cdns_mhdp_get_display_fmt(struct cdns_mhdp_device *mhdp,
+				      struct drm_bridge_state *state)
+{
+	u32 bus_fmt, bpc, pxlfmt;
+
+	bus_fmt = state->output_bus_cfg.format;
+	switch (bus_fmt) {
+	case MEDIA_BUS_FMT_RGB161616_1X48:
+		pxlfmt = DRM_COLOR_FORMAT_RGB444;
+		bpc = 16;
+		break;
+	case MEDIA_BUS_FMT_YUV16_1X48:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB444;
+		bpc = 16;
+		break;
+	case MEDIA_BUS_FMT_RGB121212_1X36:
+		pxlfmt = DRM_COLOR_FORMAT_RGB444;
+		bpc = 12;
+		break;
+	case MEDIA_BUS_FMT_UYVY12_1X24:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB422;
+		bpc = 12;
+		break;
+	case MEDIA_BUS_FMT_YUV12_1X36:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB444;
+		bpc = 12;
+		break;
+	case MEDIA_BUS_FMT_RGB101010_1X30:
+		pxlfmt = DRM_COLOR_FORMAT_RGB444;
+		bpc = 10;
+		break;
+	case MEDIA_BUS_FMT_UYVY10_1X20:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB422;
+		bpc = 10;
+		break;
+	case MEDIA_BUS_FMT_YUV10_1X30:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB444;
+		bpc = 10;
+		break;
+	case MEDIA_BUS_FMT_RGB888_1X24:
+		pxlfmt = DRM_COLOR_FORMAT_RGB444;
+		bpc = 8;
+		break;
+	case MEDIA_BUS_FMT_UYVY8_1X16:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB422;
+		bpc = 8;
+		break;
+	case MEDIA_BUS_FMT_YUV8_1X24:
+		pxlfmt = DRM_COLOR_FORMAT_YCRCB444;
+		bpc = 8;
+		break;
+	default:
+		pxlfmt = DRM_COLOR_FORMAT_RGB444;
+		bpc = 8;
+	}
+
+	mhdp->display_fmt.color_format = pxlfmt;
+	mhdp->display_fmt.bpc = bpc;
+}
+
 static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp,
 				      const struct drm_display_mode *mode)
 {
@@ -2129,6 +2173,8 @@ static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
 	struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
 	const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 
+	cdns_mhdp_get_display_fmt(mhdp, bridge_state);
+
 	mutex_lock(&mhdp->link_mutex);
 
 	if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
@@ -2456,7 +2502,7 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
 	mhdp->link.rate = mhdp->host.link_rate;
 	mhdp->link.num_lanes = mhdp->host.lanes_cnt;
 
-	/* The only currently supported format */
+	/* Initialize color format bpc and y_only to default values*/
 	mhdp->display_fmt.y_only = false;
 	mhdp->display_fmt.color_format = DRM_COLOR_FORMAT_RGB444;
 	mhdp->display_fmt.bpc = 8;
-- 
2.17.1