linux-kernel - Re: [PATCH v3 3/9] drm/mipi-dsi: mipi_dsi_*_write functions don't need to ratelimit prints

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Date: Thu, 2 May 2024 09:27:29 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Douglas Anderson <dianders@...omium.org>, dri-devel@...ts.freedesktop.org
Cc: Linus Walleij <linus.walleij@...aro.org>,
 Jani Nikula <jani.nikula@...ux.intel.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Cong Yang <yangcong5@...qin.corp-partner.google.com>,
 Hsin-Yi Wang <hsinyi@...gle.com>, Brian Norris <briannorris@...omium.org>,
 Sam Ravnborg <sam@...nborg.org>,
 Javier Martinez Canillas <javierm@...hat.com>, Joel Selvaraj
 <jo@...amily.in>, lvzhaoxiong@...qin.corp-partner.google.com,
 Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/9] drm/mipi-dsi: mipi_dsi_*_write functions don't
 need to ratelimit prints

On 01/05/2024 17:41, Douglas Anderson wrote:
> We really don't expect these errors to be printed over and over
> again. When a driver hits the error it should bail out. Just use a
> normal error print.
> 
> This gives a nice space savings for users of these functions:
> 
> $ scripts/bloat-o-meter \
>    .../before/panel-novatek-nt36672e.ko \
>    .../after/panel-novatek-nt36672e.ko
> add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-16760 (-16760)
> Function                                     old     new   delta
> nt36672e_1080x2408_60hz_init               17080   10640   -6440
> nt36672e_1080x2408_60hz_init._rs           10320       -  -10320
> Total: Before=31815, After=15055, chg -52.68%
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
> Changes in v3:
> - ("mipi_dsi_*_write functions don't need to ratelimit...") moved earlier.
> 
> Changes in v2:
> - New
> 
>   include/drm/drm_mipi_dsi.h | 24 +++++++++++-------------
>   1 file changed, 11 insertions(+), 13 deletions(-)
> 
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index e0f56564bf97..67967be48dbd 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -314,17 +314,16 @@ int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
>    * @dsi: DSI peripheral device
>    * @seq: buffer containing the payload
>    */
> -#define mipi_dsi_generic_write_seq(dsi, seq...)                                 \
> -	do {                                                                    \
> -		static const u8 d[] = { seq };                                  \
> -		struct device *dev = &dsi->dev;                                 \
> -		ssize_t ret;                                                    \
> -		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));            \
> -		if (ret < 0) {                                                  \
> -			dev_err_ratelimited(dev, "transmit data failed: %zd\n", \
> -					    ret);                               \
> -			return ret;                                             \
> -		}                                                               \
> +#define mipi_dsi_generic_write_seq(dsi, seq...)                           \
> +	do {                                                              \
> +		static const u8 d[] = { seq };                            \
> +		struct device *dev = &dsi->dev;                           \
> +		ssize_t ret;                                              \
> +		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));      \
> +		if (ret < 0) {                                            \
> +			dev_err(dev, "transmit data failed: %zd\n", ret); \
> +			return ret;                                       \
> +		}                                                         \
>   	} while (0)
>   
>   /**
> @@ -340,8 +339,7 @@ int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
>   		ssize_t ret;                                                \
>   		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));     \
>   		if (ret < 0) {                                              \
> -			dev_err_ratelimited(                                \
> -				dev, "sending command %#02x failed: %zd\n", \
> +			dev_err(dev, "sending command %#02x failed: %zd\n", \
>   				cmd, ret);                                  \
>   			return ret;                                         \
>   		}                                                           \

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>