KMS has a lot of code sequences where the driver has to select a certain HW
configuration among the available ones. For e.g., link rate, clock,
voltage swing, training pattern etc. Printing such low-level messages is
valuable for debugging display problems. But, will bloat dmesg if printed
with DRM_DEBUG_KMS.
DRM_DEBUG_DISPLAY will specifically address such cases where the developer
wants communicate why a display related configuration choice was made.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
include/drm/drmP.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index d377865..c831c69 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -114,6 +114,9 @@ struct dma_buf_attachment;
* VBL: used for verbose debug message in the vblank code
* This is the category used by the DRM_DEBUG_VBL() macro.
*
+ * DISPLAY: used for low-level display configuration messages.
+ * This is the category used by the DRM_DEBUG_DISPLAY() macro.
+ *
* Enabling verbose debug messages is done through the drm.debug parameter,
* each category being enabled by a bit.
*
@@ -133,6 +136,7 @@ struct dma_buf_attachment;
#define DRM_UT_PRIME 0x08
#define DRM_UT_ATOMIC 0x10
#define DRM_UT_VBL 0x20
+#define DRM_UT_DISPLAY 0x40
extern __printf(2, 3)
void drm_ut_debug_printk(const char *function_name,
@@ -230,6 +234,11 @@ void drm_err(const char *format, ...);
if (unlikely(drm_debug & DRM_UT_VBL)) \
drm_ut_debug_printk(__func__, fmt, ##args); \
} while (0)
+#define DRM_DEBUG_DISPLAY(fmt, args...) \
+ do { \
+ if (unlikely(drm_debug & DRM_UT_DISPLAY)) \
+ drm_ut_debug_printk(__func__, fmt, ##args); \
+ } while (0)
/*@}*/
--
2.5.0
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