linux-kernel - Re: [PATCH v3 2/4] drm/mipi-dsi: use correct return type for the DSC functions

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Date: Tue, 2 Apr 2024 23:00:30 +0200
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: 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>, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 2/4] drm/mipi-dsi: use correct return type for the DSC
 functions

On 2024-04-02 02:51:13, Dmitry Baryshkov wrote:
> 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")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Reviewed-by: Marijn Suijten <marijn.suijten@...ainline.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
>