linux-kernel - Re: [PATCH] drm/ingenic: Fix bad revert

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Date:   Mon, 12 Oct 2020 21:13:53 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-next@...r.kernel.org
Subject: Re: [PATCH] drm/ingenic: Fix bad revert



Le lun. 12 oct. 2020 à 16:10, Daniel Vetter <daniel@...ll.ch> a écrit 
:
> On Mon, Oct 12, 2020 at 12:25:09PM +0200, Paul Cercueil wrote:
>>  Fix a badly reverted commit. The revert commit was cherry-picked 
>> from
>>  drm-misc-next to drm-misc-next-fixes, and in the process some 
>> unrelated
>>  code was added.
>> 
>>  Fixes: a3fb64c00d44 "Revert "gpu/drm: ingenic: Add option to mmap 
>> GEM buffers cached""
>>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> 
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

I applied the patch to drm-misc-next-fixes.

Thanks,
-Paul

> And yes if you use git cherry-pick it'll do a 3 way merge, and
> occasionally it's very tricky to resolve that properly. Especially 
> when
> you're not used to it.
> 
> What I tend to do to double check cerry-picks is git show both 
> commits,
> and compare the entire diff line-by-line to make sure I didn't 
> misplace
> anything.
> 
> Another trick is to use the raw patch instead of cherry-pick, since 
> that
> won't do a 3 way merge where you might get confused with other 
> context and
> fun stuff like that.
> 
> Cheers, Daniel
>>  ---
>>   drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 16 ----------------
>>   1 file changed, 16 deletions(-)
>> 
>>  diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c 
>> b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>>  index 1be1235bd546..a3d1617d7c67 100644
>>  --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>>  +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>>  @@ -440,20 +440,6 @@ void ingenic_drm_plane_config(struct device 
>> *dev,
>>   	}
>>   }
>> 
>>  -static void ingenic_drm_update_palette(struct ingenic_drm *priv,
>>  -				       const struct drm_color_lut *lut)
>>  -{
>>  -	unsigned int i;
>>  -
>>  -	for (i = 0; i < ARRAY_SIZE(priv->dma_hwdescs->palette); i++) {
>>  -		u16 color = drm_color_lut_extract(lut[i].red, 5) << 11
>>  -			| drm_color_lut_extract(lut[i].green, 6) << 5
>>  -			| drm_color_lut_extract(lut[i].blue, 5);
>>  -
>>  -		priv->dma_hwdescs->palette[i] = color;
>>  -	}
>>  -}
>>  -
>>   static void ingenic_drm_plane_atomic_update(struct drm_plane 
>> *plane,
>>   					    struct drm_plane_state *oldstate)
>>   {
>>  @@ -464,8 +450,6 @@ static void 
>> ingenic_drm_plane_atomic_update(struct drm_plane *plane,
>>   	dma_addr_t addr;
>> 
>>   	if (state && state->fb) {
>>  -		crtc_state = state->crtc->state;
>>  -
>>   		addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
>>   		width = state->src_w >> 16;
>>   		height = state->src_h >> 16;
>>  --
>>  2.28.0
>> 
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch