APPLIED[Unstable]: [PATCH v2 0/2][SRU][F/OEM-5.6/G/U] Enable PSR on HP ZBook Studio G7

[Seth Forshee]

On Wed, Sep 30, 2020 at 03:05:10PM +0800, You-Sheng Yang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1897501
> 
> [Impact]
> 
> On some OEM platforms equipped PSR eanbled panels, i915 renders screen
> half occupied and corrupted, and restore PSR previously disabled in
> LP: #1849947 fixes this issue.
> 
> [Fix]
> 
> While PSR has been disabled currently in Ubuntu kernels from oem-osp1
> 5.0 to current unstable 5.9, there is no guaranteed PSR support in
> Focal, and PSR is actually planned for v5.10 or later kernels, reverting
> the disabling commit ("UBUNTU: SAUCE: drm/i915: Disable PSR by default
> on all platforms") doesn't seem a viable solution here.
> 
> This patchset introduces a new, Ubuntu only, EDID quirk
> 'DP_QUIRK_FORCE_PSR_CHIP_DEFAULT' to identify the target panel and overrides
> `enable_psr` to -1(chip defaults) when it's set to 0(disabled).
> 
> [Test Case]
> 
> On the target device, the PSR value should be 0 by default:
> 
>   $ sudo cat /sys/module/i915/parameters/enable_psr
>   0
> 
> When applied, the PSR should be -1 even if no "i915.enable_psr=-1" is
> passed as kernel boot parameter, and .
> 
>   $ sudo cat /sys/module/i915/parameters/enable_psr
>   -1
> 
> With drm.debug=0x04, one should also find following message in dmesg:
> 
>   [drm:intel_psr_enable_locked [i915]] Enabling PSR2
> 
> [Regression Potential]
> Low. This affects only the target panel with EDID mfg CMN prod-ID 19-15.

Applied to unstable/master, thanks!