[PATCH v3] drm: Print bad EDID notices less often

[Andi Kleen]

I have an old monitor that reports a zero EDID block, which results in a
warning message. This happens on every screen save cycle, and maybe in
some other situations, and over time the whole kernel log gets filled
with these redundant messages.

Make most of these prints conditional on bad_edid_count like other verbose EDID
messages.

Signed-off-by: Andi Kleen <ak at linux.intel.com>

---

v2: Use bad_edid_count instead of _once.
v3: Move rate limit logic into dedicated wrapper.
---
 drivers/gpu/drm/drm_edid.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 855beafb76ff..64d41dd605f1 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1949,6 +1949,18 @@ static void edid_block_status_print(enum edid_block_status status,
 	}
 }
 
+static void edid_block_status_print_rl(struct drm_connector *connector,
+				    enum edid_block_status status,
+				    const struct edid *block,
+				    int block_num)
+{
+	if (status != EDID_BLOCK_OK &&
+		!connector->bad_edid_counter++ &&
+		!drm_debug_enabled(DRM_UT_KMS))
+		return;
+	edid_block_status_print(status, block, block_num);
+}
+
 static void edid_block_dump(const char *level, const void *block, int block_num)
 {
 	enum edid_block_status status;
@@ -2375,7 +2387,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector,
 
 	status = edid_block_read(edid, 0, read_block, context);
 
-	edid_block_status_print(status, edid, 0);
+	edid_block_status_print_rl(connector, status, edid, 0);
 
 	if (status == EDID_BLOCK_READ_FAIL)
 		goto fail;
@@ -2409,7 +2421,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector,
 
 		status = edid_block_read(block, i, read_block, context);
 
-		edid_block_status_print(status, block, i);
+		edid_block_status_print_rl(connector, status, block, i);
 
 		if (!edid_block_status_valid(status, edid_block_tag(block))) {
 			if (status == EDID_BLOCK_READ_FAIL)
-- 
2.46.1