On Mon, Aug 20, 2018 at 12:03:19PM +0100, Liviu Dudau wrote:
> On Fri, Aug 17, 2018 at 06:33:04PM +0100, Ayan Kumar Halder wrote:
> > For multi-planar formats, while calculating offsets in planes with index
> > greater than 0
> > (ie second plane, third plane, etc), one needs to divide (src_x * cpp) with
> > horizontal
> > chroma subsampling factor and (src_y * pitch) with vertical chroma
> > subsampling factor.
> >
> > The reason being that the planes contain subsampled (ie reduced) data (by a
> > factor of 2) and thus the
>
> drop the extraneous "the" at the end of the line.
>
> > while calculating the byte position coresponding to the x and y
> > co-ordinates, one needs to be
>
> and drop the extraneous "be" at the end of this line.
>
> > divide it with the sampling factor.
> >
> > Signed-off-by: Ayan Kumar halder <ayan.hal...@arm.com>
>
> Otherwise, it looks good to me!
>
> Reviewed-by: Liviu Dudau <liviu.du...@arm.com>
>
Thanks Liviu. I will update the commit message and push this in
drm-misc-next.
> Best regards,
> Liviu
>
> > ---
> > drivers/gpu/drm/drm_fb_cma_helper.c | 11 +++++++++--
> > 1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
> > b/drivers/gpu/drm/drm_fb_cma_helper.c
> > index b127061..47e0e2f 100644
> > --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> > @@ -86,14 +86,21 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct
> > drm_framebuffer *fb,
> > {
> > struct drm_gem_cma_object *obj;
> > dma_addr_t paddr;
> > + u8 h_div = 1, v_div = 1;
> >
> > obj = drm_fb_cma_get_gem_obj(fb, plane);
> > if (!obj)
> > return 0;
> >
> > paddr = obj->paddr + fb->offsets[plane];
> > - paddr += fb->format->cpp[plane] * (state->src_x >> 16);
> > - paddr += fb->pitches[plane] * (state->src_y >> 16);
> > +
> > + if (plane > 0) {
> > + h_div = fb->format->hsub;
> > + v_div = fb->format->vsub;
> > + }
> > +
> > + paddr += (fb->format->cpp[plane] * (state->src_x >> 16)) / h_div;
> > + paddr += (fb->pitches[plane] * (state->src_y >> 16)) / v_div;
> >
> > return paddr;
> > }
> > --
> > 2.7.4
> >
>
> --
> ====================
> | I would like to |
> | fix the world, |
> | but they're not |
> | giving me the |
> \ source code! /
> ---------------
> ??\_(???)_/??
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