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drm/i915: Use 18 fast wake AUX sync len

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[ 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@intel.com>
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@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230530101649.2549949-1-jouni.hogander@intel.com
(cherry picked from commit b29a20f7c4995a059ed764ce42389857426397c7)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jouni Högander 2023-05-30 13:16:49 +03:00 • committed by Greg Kroah-Hartman
parent 7bf7bebdc2
commit 5f285409c9
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_dp_aux.c
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@ -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;