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

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Date: Wed,  1 May 2024 08:41:06 -0700
From: Douglas Anderson <dianders@...omium.org>
To: 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>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Joel Selvaraj <jo@...amily.in>,
	lvzhaoxiong@...qin.corp-partner.google.com,
	Douglas Anderson <dianders@...omium.org>,
	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: [PATCH v3 3/9] drm/mipi-dsi: mipi_dsi_*_write functions don't need to ratelimit prints

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;                                         \
 		}                                                           \
-- 
2.45.0.rc0.197.gbae5840b3b-goog