[PATCH xf86-video-amdgpu] Don't set modes before AMDGPUWindowExposures_oneshot is called

[Alexander.Deucher@xxxxxxx (Deucher, Alexander)]

> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf
> Of Michel Dänzer
> Sent: Thursday, March 23, 2017 5:54 AM
> To: amd-gfx at lists.freedesktop.org
> Subject: [PATCH xf86-video-amdgpu] Don't set modes before
> AMDGPUWindowExposures_oneshot is called
> 
> From: Michel Dänzer <michel.daenzer at amd.com>
> 
> The root window contents may be undefined before that, so we don't to
> show anything yet.
> 
> Fixes a crash on startup with rotation and virtual resolution set in
> xorg.conf.
> 
> Bugzilla: https://bugs.freedesktop.org/100276
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  src/amdgpu_drv.h      | 5 +++++
>  src/amdgpu_kms.c      | 6 +++---
>  src/drmmode_display.c | 6 ++++++
>  3 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/src/amdgpu_drv.h b/src/amdgpu_drv.h
> index 532d99daa..e5c44dc36 100644
> --- a/src/amdgpu_drv.h
> +++ b/src/amdgpu_drv.h
> @@ -315,6 +315,11 @@ Bool amdgpu_dri3_screen_init(ScreenPtr screen);
> 
>  /* amdgpu_kms.c */
>  Bool amdgpu_scanout_do_update(xf86CrtcPtr xf86_crtc, int scanout_id);
> +void AMDGPUWindowExposures_oneshot(WindowPtr pWin, RegionPtr
> pRegion
> +#if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,16,99,901,0)
> +				   , RegionPtr pBSRegion
> +#endif
> +				   );
> 
>  /* amdgpu_present.c */
>  Bool amdgpu_present_screen_init(ScreenPtr screen);
> diff --git a/src/amdgpu_kms.c b/src/amdgpu_kms.c
> index 4821e932f..90d0288af 100644
> --- a/src/amdgpu_kms.c
> +++ b/src/amdgpu_kms.c
> @@ -1258,11 +1258,11 @@ static Bool
> AMDGPUCreateWindow_oneshot(WindowPtr pWin)
>  }
> 
>  /* When the root window is mapped, set the initial modes */
> -static void AMDGPUWindowExposures_oneshot(WindowPtr pWin,
> RegionPtr pRegion
> +void AMDGPUWindowExposures_oneshot(WindowPtr pWin, RegionPtr
> pRegion
>  #if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,16,99,901,0)
> -					  , RegionPtr pBSRegion
> +				   , RegionPtr pBSRegion
>  #endif
> -	)
> +				   )
>  {
>  	ScreenPtr pScreen = pWin->drawable.pScreen;
>  	ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
> diff --git a/src/drmmode_display.c b/src/drmmode_display.c
> index 2cdea90ad..a041e8b67 100644
> --- a/src/drmmode_display.c
> +++ b/src/drmmode_display.c
> @@ -779,6 +779,12 @@ drmmode_set_mode_major(xf86CrtcPtr crtc,
> DisplayModePtr mode,
>  	drmModeModeInfo kmode;
>  	uint32_t bo_handle;
> 
> +	/* The root window contents may be undefined before the
> WindowExposures
> +	 * hook is called for it, so bail if we get here before that
> +	 */
> +	if (pScreen->WindowExposures ==
> AMDGPUWindowExposures_oneshot)
> +		return FALSE;
> +
>  	saved_mode = crtc->mode;
>  	saved_x = crtc->x;
>  	saved_y = crtc->y;
> --
> 2.11.0
> 
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