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[v4,5/5] drm/i915/display: Increase number of fast wake precharge pulses

Message ID 20240306083427.2040475-6-jouni.hogander@intel.com (mailing list archive)
State New, archived
Headers show
Series IO and fast wake lines calculation and increase fw sync length | expand

Commit Message

Hogander, Jouni March 6, 2024, 8:34 a.m. UTC 
Increasing number of fast wake sync pulses seem to fix problems with
certain PSR panels. This should be ok for other panels as well as the eDP
specification allows 10...16 precharge pulses and we are still within that
range.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9739
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index 7e69be100d90..5dff1bc85d61 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -145,7 +145,7 @@  static int intel_dp_aux_sync_len(void)
 
 int intel_dp_aux_fw_sync_len(void)
 {
-	int precharge = 10; /* 10-16 */
+	int precharge = 12; /* 10-16 */
 	int preamble = 8;
 
 	return precharge + preamble;