Patch "drm/mipi-dsi: use correct return type for the DSC functions" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/mipi-dsi: use correct return type for the DSC functions

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-mipi-dsi-use-correct-return-type-for-the-dsc-fun.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 89f910191dfcdc1c9b8f07a674225a7e8390f7b5
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date:   Mon Apr 8 02:53:51 2024 +0300

    drm/mipi-dsi: use correct return type for the DSC functions
    
    [ Upstream commit de1c705c50326acaceaf1f02bc5bf6f267c572bd ]
    
    The functions mipi_dsi_compression_mode() and
    mipi_dsi_picture_parameter_set() return 0-or-error rather than a buffer
    size. Follow example of other similar MIPI DSI functions and use int
    return type instead of size_t.
    
    Fixes: f4dea1aaa9a1 ("drm/dsi: add helpers for DSI compression mode and PPS packets")
    Reviewed-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
    Reviewed-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240408-lg-sw43408-panel-v5-2-4e092da22991@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index ef6e416522f8a..9874ff6d47181 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -654,7 +654,7 @@ EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
  *
  * Return: 0 on success or a negative error code on failure.
  */
-ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
+int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
 {
 	/* Note: Needs updating for non-default PPS or algorithm */
 	u8 tx[2] = { enable << 0, 0 };
@@ -679,8 +679,8 @@ EXPORT_SYMBOL(mipi_dsi_compression_mode);
  *
  * Return: 0 on success or a negative error code on failure.
  */
-ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
-				       const struct drm_dsc_picture_parameter_set *pps)
+int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
+				   const struct drm_dsc_picture_parameter_set *pps)
 {
 	struct mipi_dsi_msg msg = {
 		.channel = dsi->channel,
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index c0aec0d4d664e..3011d33eccbd2 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -241,9 +241,9 @@ int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 					    u16 value);
-ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
-ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
-				       const struct drm_dsc_picture_parameter_set *pps);
+int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
+int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
+				   const struct drm_dsc_picture_parameter_set *pps);
 
 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
 			       size_t size);