linux-kernel - [PATCH] drm/mipi-dsi: Add dsc_slice_per_pkt field to mipi_dsi

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Message-ID: <20251014094934.322834-1-caojunjie650@gmail.com>
Date: Tue, 14 Oct 2025 17:49:34 +0800
From: Junjie Cao <caojunjie650@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Junjie Cao <caojunjie650@...il.com>,
	Jonathan Marek <jonathan@...ek.ca>,
	Jun Nie <jun.nie@...aro.org>
Subject: [PATCH] drm/mipi-dsi: Add dsc_slice_per_pkt field to mipi_dsi_device

Some DSI panels require multiple DSC slices to be transmitted within
a single DSC packet. The DSI host will only correctly program its
registers and avoid display corruption if the dsc_slice_per_pkt
parameter is provided.

Since dsc_slice_per_pkt is not part of the VESA DSC standard, it should
not be added to struct drm_dsc_config. Instead, introduce a new field
in struct mipi_dsi_device so that panel drivers can specify the required
number of slices per packet, and DSI host drivers can retrieve it
accordingly.

Originally, this change was part of a single patch that also included
the DSI host modification. This patch splits out the mipi_dsi_device
changes. The corresponding DSI host patch for Qualcomm MSM, along with
a panel driver that makes use of this field, will be submitted
separately.

Co-developed-by: Jonathan Marek <jonathan@...ek.ca>
Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
Signed-off-by: Jun Nie <jun.nie@...aro.org>
Signed-off-by: Junjie Cao <caojunjie650@...il.com>
---
 include/drm/drm_mipi_dsi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 3aba7b380..a6357e8c2 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -180,6 +180,7 @@ struct mipi_dsi_device_info {
  * be set to the real limits of the hardware, zero is only accepted for
  * legacy drivers
  * @dsc: panel/bridge DSC pps payload to be sent
+ * @dsc_slice_per_pkt: number of DSC slices to be sent in a single packet
  */
 struct mipi_dsi_device {
 	struct mipi_dsi_host *host;
@@ -194,6 +195,7 @@ struct mipi_dsi_device {
 	unsigned long hs_rate;
 	unsigned long lp_rate;
 	struct drm_dsc_config *dsc;
+	unsigned int dsc_slice_per_pkt;
 };

 /**
-- 
2.51.0