[Intel-gfx] "drm/i915: Use the correct crtc when sanitizing plane mapping" seems to cause the readback plane state to always be 0

[Ville Syrjälä]

On Mon, Nov 19, 2018 at 11:47:00PM +0100, Hans de Goede wrote:
> Hi Ville,
> 
> While debugging the briefly purple screen on DSI panels issue for
> which I just send a revert, I also noticed something odd with
> your commit 9b27390139db ("drm/i915: Use the correct crtc when
> sanitizing plane mapping").
> 
> When comparing drm.debug=0x1e logs between 4.19 and 4.20-rc1
> I noticed that this bit of the initial hw state readback logging
> in 4.19:
> 
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x1
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x1
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x1
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x1
> 
> Changed to:
> 
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x0
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x0
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x0
> [drm:intel_modeset_setup_hw_state [i915]] pipe B active planes 0x0

That debug message is just garbage now. I removed it in the following
commit.

-- 
Ville Syrjälä
Intel