linux-kernel - Re: [PATCH] drm/i915: Fixup legacy plane->crtc link for initial fb config

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Date:	Thu, 26 Mar 2015 14:08:28 +0200
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Cc:	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Matt Roper <matthew.d.roper@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH] drm/i915: Fixup legacy plane->crtc link for initial fb config

On Wed, 25 Mar 2015, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> This is a very similar bug in the load detect code fixed in
>
> commit 9128b040eb774e04bc23777b005ace2b66ab2a85
> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> Date:   Tue Mar 3 17:31:21 2015 +0100
>
>     drm/i915: Fix modeset state confusion in the load detect code
>
> But this time around it was the initial fb code that forgot to update
> the plane->crtc pointer. Otherwise it's the exact same bug, with the
> exact same restrains (any set_config call/ioctl that doesn't disable
> the pipe papers over the bug for free, so fairly hard to hit in normal
> testing). So if you want the full explanation just go read that one
> over there - it's rather long ...
>
> Cc: Matt Roper <matthew.d.roper@...el.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Josh Boyer <jwboyer@...oraproject.org>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> ---
> This is the version for -next. The one for -fixes just needs an
> s/primary/intel_crtc->base.primary/ and some fudge in the diff. I just
> want to apply this in both trees since with all the cherry-picking the
> conflicts are fun already and with this patch in both places we can
> just go with the code in -next.

I've also picked this up from -next to drm-intel-fixes.

BR,
Jani.


>
> Cheers, Daniel
> ---
>  drivers/gpu/drm/i915/intel_display.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ceb2e61b4c91..cb508542c6ab 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2594,6 +2594,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>  
>  		primary->fb = &plane_config->fb->base;
>  		primary->state->crtc = &intel_crtc->base;
> +		primary->crtc = &intel_crtc->base;
>  		update_state_fb(primary);
>  
>  		return;
> @@ -2627,6 +2628,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>  			drm_framebuffer_reference(c->primary->fb);
>  			primary->fb = c->primary->fb;
>  			primary->state->crtc = &intel_crtc->base;
> +			primary->crtc = &intel_crtc->base;
>  			update_state_fb(intel_crtc->base.primary);
>  			obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
>  			break;
> -- 
> 2.1.4
>

-- 
Jani Nikula, Intel Open Source Technology Center
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