linux-kernel - [PATCH v1 2/2] drm/bridge: ti-sn65dsi83: Add DSI video mode configuration

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Date:   Thu, 30 Mar 2023 12:17:52 +0200
From:   Francesco Dolcini <francesco@...cini.it>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        dri-devel@...ts.freedesktop.org, Marek Vasut <marex@...x.de>
Cc:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/2] drm/bridge: ti-sn65dsi83: Add DSI video mode configuration

From: Francesco Dolcini <francesco.dolcini@...adex.com>

Enable configuration of the DSI video mode instead of hard-coding
MIPI_DSI_MODE_VIDEO_BURST. The bridge support any of burst-mode,
non-burst with sync event or non-burst with sync pulse

With this change is possible to use the bridge with host DSI
that do not support burst mode.

Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 91ecfbe45bf9..144d0de0d278 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -145,6 +145,7 @@ struct sn65dsi83 {
 	struct drm_bridge		*panel_bridge;
 	struct gpio_desc		*enable_gpio;
 	struct regulator		*vcc;
+	u32				dsi_video_mode;
 	bool				lvds_dual_link;
 	bool				lvds_dual_link_even_odd_swap;
 };
@@ -603,6 +604,9 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
 		return dev_err_probe(dev, PTR_ERR(ctx->vcc),
 				     "Failed to get supply 'vcc'\n");
 
+	ctx->dsi_video_mode = 0;
+	of_property_read_u32(dev->of_node, "dsi-video-mode", &ctx->dsi_video_mode);
+
 	return 0;
 }
 
@@ -642,7 +646,25 @@ static int sn65dsi83_host_attach(struct sn65dsi83 *ctx)
 
 	dsi->lanes = dsi_lanes;
 	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+	switch (ctx->dsi_video_mode) {
+	case 0:
+		/* burst mode */
+		dsi->mode_flags |= MIPI_DSI_MODE_VIDEO_BURST;
+		break;
+	case 1:
+		/* non-burst mode with sync event */
+		break;
+	case 2:
+		/* non-burst mode with sync pulse */
+		dsi->mode_flags |= MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+		break;
+	default:
+		dev_warn(dev, "invalid video mode %d\n", ctx->dsi_video_mode);
+		break;
+	}
+
 
 	ret = devm_mipi_dsi_attach(dev, dsi);
 	if (ret < 0) {
-- 
2.25.1