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From: Sudarshan Shetty <tessolveupstream@gmail.com>
To: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org
Cc: Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
	jernej.skrabec@gmail.com, luca.ceresoli@bootlin.com,
	maarten.lankhorst@linux.intel.com, mripard@kernel.org,
	tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch,
	alexander.stein@ew.tq-group.com, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org,
	Sudarshan Shetty <tessolveupstream@gmail.com>
Subject: [PATCH v4 2/2] drm: bridge: ti-sn65dsi83: Disable video burst mode for LVDS stability
Date: Wed, 27 May 2026 14:27:36 +0530	[thread overview]
Message-ID: <20260527085736.920390-3-tessolveupstream@gmail.com> (raw)
In-Reply-To: <20260527085736.920390-1-tessolveupstream@gmail.com>

The current DSI configuration enables MIPI_DSI_MODE_VIDEO_BURST.
while burst mode is supported by the hardware, its use
depends on continuous clock behavior from the DSI host. In practice,
burst mode may introduce instability depending on the host controller
implementation, as the DSI link may transition to low-power state
between bursts.

Testing showed improved display stability when using non-burst mode on
affected panels.

Remove MIPI_DSI_MODE_VIDEO_BURST and use non-burst video mode.

Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Sudarshan Shetty <tessolveupstream@gmail.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index c03ff1ea9df8..6b5a6019c30d 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -976,8 +976,8 @@ 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 |
-			  MIPI_DSI_MODE_VIDEO_NO_HSA | MIPI_DSI_MODE_NO_EOT_PACKET;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_NO_HSA |
+			  MIPI_DSI_MODE_NO_EOT_PACKET;
 
 	ret = devm_mipi_dsi_attach(dev, dsi);
 	if (ret < 0) {
-- 
2.34.1


  parent reply	other threads:[~2026-05-27  8:58 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-27  8:57 [PATCH v4 0/2] drm: bridge: ti-sn65dsi83: Fix DSI mode flags for stable LVDS output Sudarshan Shetty
2026-05-27  8:57 ` [PATCH v4 1/2] drm: bridge: ti-sn65dsi83: Remove NO_HFP and NO_HBP mode flags for LVDS stability Sudarshan Shetty
2026-05-29 15:27   ` Luca Ceresoli
2026-05-27  8:57 ` Sudarshan Shetty [this message]
  -- strict thread matches above, loose matches on Subject: below --
2026-05-30 18:51 [PATCH v4 2/2] drm: bridge: ti-sn65dsi83: Disable video burst mode " Sean Nyekjaer
2026-06-05 15:18 ` Luca Ceresoli
2026-06-05 16:09   ` Laurent Pinchart
2026-06-05 16:56     ` Luca Ceresoli
2026-06-05 17:31       ` Laurent Pinchart
2026-06-08  6:33         ` Sean Nyekjaer
2026-06-08  7:12       ` Maxime Ripard
2026-06-08  6:37     ` Alexander Stein
2026-06-08  7:09     ` Maxime Ripard
2026-06-08  7:14       ` Laurent Pinchart
2026-06-08  8:59         ` Maxime Ripard

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