Patch "drm/i915: Use 18 fast wake AUX sync len" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/i915: Use 18 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-use-18-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.



commit c628d60c547c0a30183d885b531160a75e5c16a6
Author: Jouni Högander <jouni.hogander@xxxxxxxxx>
Date:   Tue May 30 13:16:49 2023 +0300

    drm/i915: Use 18 fast wake AUX sync len
    
    [ Upstream commit 2d6f2f79e06571d41eb1223abebe9097511c9544 ]
    
    HW default for wake sync pulses is 18. 10 precharge and 8 preamble. There
    is no reason to change this especially as it is causing problems with
    certain eDP panels.
    
    v3: Change "Fixes:" commit
    v2: Remove "fast wake" repeat from subject
    
    Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
    Fixes: e1c71f8f9180 ("drm/i915: Fix fast wake AUX sync len")
    Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8475
    Reviewed-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230530101649.2549949-1-jouni.hogander@xxxxxxxxx
    (cherry picked from commit b29a20f7c4995a059ed764ce42389857426397c7)
    Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index f0485521e58ad..d507a20822db1 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -129,7 +129,7 @@ static int intel_dp_aux_sync_len(void)
 
 static int intel_dp_aux_fw_sync_len(void)
 {
-	int precharge = 16; /* 10-16 */
+	int precharge = 10; /* 10-16 */
 	int preamble = 8;
 
 	return precharge + preamble;



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