This is a note to let you know that I've just added the patch titled
drm/i915: Fix fast wake AUX sync len
to the 5.15-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-i915-fix-fast-wake-aux-sync-len.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e1c71f8f918047ce822dc19b42ab1261ed259fd1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Wed, 29 Mar 2023 20:24:33 +0300
Subject: drm/i915: Fix fast wake AUX sync len
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit e1c71f8f918047ce822dc19b42ab1261ed259fd1 upstream.
Fast wake should use 8 SYNC pulses for the preamble
and 10-16 SYNC pulses for the precharge. Reduce our
fast wake SYNC count to match the maximum value.
We also use the maximum precharge length for normal
AUX transactions.
Cc: stable@xxxxxxxxxxxxxxx
Cc: Jouni Högander <jouni.hogander@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329172434.18744-1-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
(cherry picked from commit 605f7c73133341d4b762cbd9a22174cc22d4c38b)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_aux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -167,7 +167,7 @@ static u32 skl_get_aux_send_ctl(struct i
DP_AUX_CH_CTL_TIME_OUT_MAX |
DP_AUX_CH_CTL_RECEIVE_ERROR |
(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
- DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
+ DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(24) |
DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
if (intel_phy_is_tc(i915, phy) &&
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-5.15/drm-i915-fix-fast-wake-aux-sync-len.patch
