This is a note to let you know that I've just added the patch titled
drm: aux ->transfer() can return 0, deal with it
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-aux-transfer-can-return-0-deal-with-it.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a1f5524a66ff6284d1380cdd7723de82698ff9d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Thu, 28 Jul 2016 17:54:42 +0300
Subject: drm: aux ->transfer() can return 0, deal with it
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit a1f5524a66ff6284d1380cdd7723de82698ff9d3 upstream.
Restore the correct behaviour (as in check msg.reply) when aux
->transfer() returns 0. It got removed in
commit 82922da39190 ("drm/dp_helper: Retry aux transactions on all errors")
Now I can actually dump the "entire" DPCD on a Dell UP2314Q with
ddrescue. It has some offsets in the DPCD that can't be read
for some resaon, all you get is defers. Previously ddrescue would
just give up at the first unredable offset on account of
read() returning 0 means EOF. Here's the ddrescue log
for the interested:
0x00000000 0x00001400 +
0x00001400 0x00000030 -
0x00001430 0x000001D0 +
0x00001600 0x00000030 -
0x00001630 0x0001F9D0 +
0x00021000 0x00000001 -
0x00021001 0x000DEFFF +
Cc: Lyude <cpaul@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx
Fixes: 82922da39190 ("drm/dp_helper: Retry aux transactions on all errors")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -203,7 +203,7 @@ static int drm_dp_dpcd_access(struct drm
ret = aux->transfer(aux, &msg);
- if (ret > 0) {
+ if (ret >= 0) {
native_reply = msg.reply & DP_AUX_NATIVE_REPLY_MASK;
if (native_reply == DP_AUX_NATIVE_REPLY_ACK) {
if (ret == size)
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-4.7/drm-edid-add-6-bpc-quirk-for-display-aeo-model-0.patch
queue-4.7/drm-aux-transfer-can-return-0-deal-with-it.patch
queue-4.7/drm-i915-update-cdclk_freq-register-on-bdw-after-changing-cdclk-frequency.patch
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