Re: [PATCH stable-5.1 0/3] drm/i915: Prevent screen from flickering when the CDCLK changes

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Jun 10, 2019 at 02:01:39PM +0800, Jian-Hong Pan wrote:
> Hi,
> 
> After apply the commit "drm/i915: Force 2*96 MHz cdclk on glk/cnl when audio
> power is enabled", it induces the screen to flicker when the CDCLK changes on
> the laptop like ASUS E406MA. [1]
> 
> So, we need these commits to prevent that:
> commit 48d9f87ddd21 drm/i915: Save the old CDCLK atomic state
> commit 2b21dfbeee72 drm/i915: Remove redundant store of logical CDCLK state
> commit 59f9e9cab3a1 drm/i915: Skip modeset for cdclk changes if possible
> 
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=203623#c12
> 
> Jian-Hong Pan
> 
> Imre Deak (2):
>   drm/i915: Save the old CDCLK atomic state
>   drm/i915: Remove redundant store of logical CDCLK state
> 
> Ville Syrjälä (1):
>   drm/i915: Skip modeset for cdclk changes if possible
> 
>  drivers/gpu/drm/i915/i915_drv.h      |   3 +-
>  drivers/gpu/drm/i915/intel_cdclk.c   | 155 ++++++++++++++++++++++-----
>  drivers/gpu/drm/i915/intel_display.c |  48 +++++++--
>  drivers/gpu/drm/i915/intel_drv.h     |  18 +++-
>  4 files changed, 186 insertions(+), 38 deletions(-)

These are all big patches, I would like to get an ack from the i915
developer(s) that these are acceptable for the stable tree before
applying them...

thanks,

greg k-h