linux-kernel - Re: [Intel-gfx] [git pull] drm fixes

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Message-ID: <BLU436-SMTP2349C43A498BAE6A55D27C79E0B0@phx.gbl>
Date:	Wed, 25 Mar 2015 22:56:45 +0800
From:	Xi Ruoyao <xry111@...look.com>
To:	Josh Boyer <jwboyer@...oraproject.org>,
	Dave Airlie <airlied@...ux.ie>,
	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [git pull] drm fixes



On 03/25/2015 at 10:00 PM, Daniel Vetter wrote:
> On Wed, Mar 25, 2015 at 09:11:17AM -0400, Josh Boyer wrote:
>> On Wed, Mar 25, 2015 at 4:54 AM, Daniel Vetter <daniel@...ll.ch> wrote:
>>>>>> commit f55548b5af87ebfc586ca75748947f1c1b1a4a52
>>>>>> Author: Damien Lespiau <damien.lespiau@...el.com>
>>>>>> Date:   Thu Feb 5 18:30:20 2015 +0000
>>>>>>
>>>>>>      drm/i915: Don't try to reference the fb in get_initial_plane_config()
>>>>>>
>>>>>>  From linux-next?
>>>>> Yes, building now.  Will let you know as soon as I test it on both machines.
>>>> OK, with that commit applied I no longer get the kref.h splat and the
>>>> NUC machine boots headless.  I still see the backtrace below on both
>>>> the NUC and the macbook.  I have a copy of it with drm.debug=0xff from
>>>> the NUC here:
>>>>
>>>> https://jwboyer.fedorapeople.org/pub/nuc-drm-debug-ff-with-fixes.txt
>>>>
>>>> Getting better at least :).
>>> On top of what you currently have please also cherry-pick
>>>
>>> commit fb9981aa675eb7b398849915364916fd98833cfa
>>> Author: Damien Lespiau <damien.lespiau@...el.com>
>>> Date:   Thu Feb 5 19:24:25 2015 +0000
>>>
>>>      drm/i915: Fix atomic state when reusing the firmware fb
>>>
>>> from -next. Let's hope this terminates eventually ;-)
>> Hm.  That one doesn't apply cleanly.  I think because it needs:
>>
>>  From 2d14030b1a9d0e89cfdca6f16851e2eac8cb4de0 Mon Sep 17 00:00:00 2001
>> From: Damien Lespiau <damien.lespiau@...el.com>
>> Date: Thu, 5 Feb 2015 17:22:18 +0000
>> Subject: drm/i915: Store the initial framebuffer in initial_plane_config
>>
>> first.  Do you want me to grab both, or should I try and figure out
>> how to backport fb9981aa67 without it?
> Oops missed that. The active ingredient is setting crtc->primary->state->crtc like this:
> -Daniel
>
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1c12262029fb..bfc14a6046ea 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2439,6 +2439,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>   		return;
>   
>   	if (intel_alloc_plane_obj(intel_crtc, plane_config)) {
> +		intel_crtc->base.primary->state->crtc = &intel_crtc->base;
>   		update_state_fb(intel_crtc->base.primary);
>   		return;
>   	}
> @@ -2469,6 +2470,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>   
>   			drm_framebuffer_reference(c->primary->fb);
>   			intel_crtc->base.primary->fb = c->primary->fb;
> +			intel_crtc->base.primary->state->crtc = &intel_crtc->base;
>   			obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
>   			break;
>   		}
I found a bad thing. My buggy code also affects linux-next now because of
the manual merge on 2014-03-16.

So, Daniel and Stephen please check it and end this mess...

It's annoying to see my code caused so much trouble. I didn't test my code
with a HDMI device or I should've found this trouble before commiting. I
apologize for that again.

-- 
Xi Ruoyao
School of Aerospace Science and Technology
Xidian University, Xi'an, China

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