linux-kernel - [PATCH v4 2/4] drm/mipi-dsi: use correct return type for the DSC functions

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Message-Id: <20240403-lg-sw43408-panel-v4-2-a386d5d3b0c6@linaro.org>
Date: Wed, 03 Apr 2024 06:43:56 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sumit Semwal <sumit.semwal@...aro.org>, 
 Caleb Connolly <caleb.connolly@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Marijn Suijten <marijn.suijten@...ainline.org>
Subject: [PATCH v4 2/4] drm/mipi-dsi: use correct return type for the DSC
 functions

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@...ainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 6 +++---
 include/drm/drm_mipi_dsi.h     | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index ef6e416522f8..9874ff6d4718 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 c0aec0d4d664..3011d33eccbd 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);

-- 
2.39.2