linux-kernel - Re: [PATCH] nouveau reclocking on nv40 not working since 77145f1cbdf8d28b46ff8070ca749bad821e0774

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Date:	Fri, 16 Aug 2013 09:16:03 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Martin Peres <martin.peres@...ri.fr>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] nouveau reclocking on nv40 not working since 77145f1cbdf8d28b46ff8070ca749bad821e0774

On Thursday 15 August 2013 18:23:06 Martin Peres wrote:
> On 15/08/2013 13:46, Pali Rohár wrote:
> > On Tuesday 13 August 2013 11:28:01 Pali Rohár wrote:
> >> Hello,
> >> 
> >> in commit 77145f1cbdf8d28b46ff8070ca749bad821e0774 was
> >> introduced error which cause that on my Nvidia 6600GT card
> >> reclocking not working anymore. There is missing assigment of
> >> return value from pll_calc to ret.
> >> 
> >> After this patch reclocking on my card working fine again.
> >> Above broken commit was introduced in kernel 3.7, so consider
> >> backporting this patch to older kernels too.
> >> 
> >> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> >> 
> >> diff --git a/drivers/gpu/drm/nouveau/nv40_pm.c
> >> b/drivers/gpu/drm/nouveau/nv40_pm.c index 3af5bcd..625f80d
> >> 100644
> >> --- a/drivers/gpu/drm/nouveau/nv40_pm.c
> >> +++ b/drivers/gpu/drm/nouveau/nv40_pm.c
> >> @@ -131,7 +131,7 @@ nv40_calc_pll(struct drm_device *dev, u32
> >> reg, struct nvbios_pll *pll, if (clk < pll->vco1.max_freq)
> >> 
> >>   		pll->vco2.max_freq = 0;
> >> 
> >> -	pclk->pll_calc(pclk, pll, clk, &coef);
> >> +	ret = pclk->pll_calc(pclk, pll, clk, &coef);
> >> 
> >>   	if (ret == 0)
> >>   	
> >>   		return -ERANGE;
> > 
> > Martin, can you look at another problem with my graphics card?
> 
> As I told you before, I'm away from my computers, so I cannot test the
> patch. However,
> this one seems quite obvious and should be pushed. Thanks.

Yes, look at that diff of that problematic commit and you will see that ret 
here is missing. It is possible to push this patch to 3.11?

-- 
Pali Rohár
pali.rohar@...il.com


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