APPLIED[L]/NACK[K/J]: [PATCH 1/2][SRU][U/L/K/J] drm/i915: Use 18 fast wake AUX sync len

[Stefan Bader]

On 06.06.23 10:10, Koba Ko wrote:
> From: Jouni Högander <jouni.hogander at intel.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/2023004
> 
> 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 at 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 at intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20230530101649.2549949-1-jouni.hogander@intel.com
> (cherry picked from commit b29a20f7c4995a059ed764ce42389857426397c7
> drmtip)
> Signed-off-by: Koba Ko <koba.ko at canonical.com>
> ---
>   drivers/gpu/drm/i915/display/intel_dp_aux.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> index faec2b8be5f46..dd399fcbb025d 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;

Applied to lunar:linux/master-next changing the SHA1 to the upstream 
reference. However this patch clearly states:

Fixes: e1c71f8f9180 ("drm/i915: Fix fast wake AUX sync len")

Which has NOT been applied to either Kinetic nor Jammy. Above change 
landed in Lunar via https://bugs.launchpad.net/bugs/2018655 which did 
not ask for backports into older kernels.

-Stefan
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_0xE8675DEECBEECEA3.asc
Type: application/pgp-keys
Size: 44613 bytes
Desc: OpenPGP public key
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20230615/29ecacdf/attachment-0001.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20230615/29ecacdf/attachment-0001.sig>