Op 17-12-2018 om 15:19 schreef Hans de Goede:
> When the pipe_config's update_pipe flag is set we may need to update the
> panel fitting settings. On GEN9+ this means we need to update the crtc's
> scaler settings.
>
> This fixes the following WARN_ON, during i915 loading on an Asrock
> B150M Pro4S/D3 board with an i5-6500 CPU / graphics:
>
> [drm:pipe_config_err [i915]] *ERROR* mismatch in pch_pfit.enabled
> (expected no, found yes)
> pipe state doesn't match!
> WARNING: CPU: 3 PID: 305 at drivers/gpu/drm/i915/intel_display.c:12084
>
> With line 12084 being the I915_STATE_WARN call inside the
> "if (!intel_pipe_config_compare())" block in verify_crtc_state().
>
> On this board with 2 1920x1080 monitors connected over HDMI the GOP
> initializes both monitors at 1920x1080 and despite no scaling being
> necessary configures a scaler for one of them.
>
> When booting with fastboot=1 on the initial modeset needs_modeset will
> be false while update_pipe is true. Since we were not calling
> skl_update_scaler_crtc() in this case we would leave the scaler enabled
> causing this error.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 62df34d30b1f..df32626e0810 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -10919,7 +10919,7 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
> }
>
> if (INTEL_GEN(dev_priv) >= 9) {
> - if (mode_changed)
> + if (mode_changed || pipe_config->update_pipe)
> ret = skl_update_scaler_crtc(pipe_config);
>
> if (!ret)
Ah, the missing bit..
https://patchwork.freedesktop.org/series/54127/
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
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