Re: [PATCH v2 2/5] drm/rockchip: vop: fix yuv plane support

[Mark yao <mark.yao@rock-chips.com>]

Hi Tomasz
     Thanks for your review, I will fix it soon.
On 2015年07月02日 14:00, Tomasz Figa wrote:
> Hi Mark,
>
> Please see my comments inline.
>
> On Fri, Jun 26, 2015 at 7:07 PM, Mark Yao <mark.yao@rock-chips.com> wrote:
>> vop support yuv with NV12, NV16 and NV24, only 2 plane yuv.
>>
>> Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
>>
>> Changes in v2:
>> - Uv buffer not support odd offset, align it.
>> - Fix error display when move yuv image.
>>
>> ---
>>   drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   63 ++++++++++++++++++++++++---
>>   1 file changed, 57 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> index 3c9f4f3..6ca08f8 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> @@ -373,6 +373,18 @@ static enum vop_data_format vop_convert_format(uint32_t format)
>>          }
>>   }
>>
>> +static bool is_yuv_support(uint32_t format)
>> +{
>> +       switch (format) {
>> +       case DRM_FORMAT_NV12:
>> +       case DRM_FORMAT_NV16:
>> +       case DRM_FORMAT_NV24:
>> +               return true;
>> +       default:
>> +               return false;
>> +       }
>> +}
>> +
>>   static bool is_alpha_support(uint32_t format)
>>   {
>>          switch (format) {
>> @@ -577,16 +589,21 @@ static int vop_update_plane_event(struct drm_plane *plane,
>>          struct vop *vop = to_vop(crtc);
>>          struct drm_gem_object *obj;
>>          struct rockchip_gem_object *rk_obj;
>> +       struct drm_gem_object *uv_obj;
>> +       struct rockchip_gem_object *rk_uv_obj;
>>          unsigned long offset;
>>          unsigned int actual_w;
>>          unsigned int actual_h;
>>          unsigned int dsp_stx;
>>          unsigned int dsp_sty;
>>          unsigned int y_vir_stride;
>> +       unsigned int uv_vir_stride;
>>          dma_addr_t yrgb_mst;
>> +       dma_addr_t uv_mst;
>>          enum vop_data_format format;
>>          uint32_t val;
>>          bool is_alpha;
>> +       bool is_yuv;
>>          bool visible;
>>          int ret;
>>          struct drm_rect dest = {
>> @@ -608,6 +625,12 @@ static int vop_update_plane_event(struct drm_plane *plane,
>>          };
>>          bool can_position = plane->type != DRM_PLANE_TYPE_PRIMARY;
>>
>> +       if (drm_format_num_planes(fb->pixel_format) > 2) {
>> +               DRM_ERROR("unsupport more than 2 plane format[%08x]\n",
>> +                         fb->pixel_format);
>> +               return -EINVAL;
>> +       }
> Hmm, do you need to check this? Doesn't the core guarantee that with
> given pixel_format you always get the right plane count? (Possibly at
> fb creation time, but I haven't checked that.)

I just want to point out that update_plane can't handle buffer number > 
2 case.

But since all windows can't support 3 buffer count format, this check 
can remove.

>> +
>>          ret = drm_plane_helper_check_update(plane, crtc, fb,
>>                                              &src, &dest, &clip,
>>                                              DRM_PLANE_HELPER_NO_SCALING,
>> @@ -624,28 +647,52 @@ static int vop_update_plane_event(struct drm_plane *plane,
>>          if (format < 0)
>>                  return format;
>>
>> +       is_yuv = is_yuv_support(fb->pixel_format);
> nit: Could you group this together with other is_* assignments, above
> the call to vop_convert_format()?
OK.
>> +
>>          obj = rockchip_fb_get_gem_obj(fb, 0);
>>          if (!obj) {
>>                  DRM_ERROR("fail to get rockchip gem object from framebuffer\n");
>>                  return -EINVAL;
>>          }
>>
>> +       if (is_yuv) {
>> +               src.x1 &= (~1) << 16;
>> +               src.y1 &= (~1) << 16;
> Hmm, if you align x1 and y1, shouldn't you also offset x2 and y2, so
> the width and height of the rectangle are preserved? Also I couldn't
> find any details on this, but what are the semantics of
> .update_plane(), should it really align the values or maybe just fail?

for yuv format, the buffer start point need align, can't be odd.

OK, I will fix the x2 and y2 offset.

>> +       }
>> +
>>          rk_obj = to_rockchip_obj(obj);
>>
>>          actual_w = (src.x2 - src.x1) >> 16;
>>          actual_h = (src.y2 - src.y1) >> 16;
>> -       crtc_x = max(0, crtc_x);
>> -       crtc_y = max(0, crtc_y);
>>
>> -       dsp_stx = crtc_x + crtc->mode.htotal - crtc->mode.hsync_start;
>> -       dsp_sty = crtc_y + crtc->mode.vtotal - crtc->mode.vsync_start;
>> +       dsp_stx = dest.x1 + crtc->mode.htotal - crtc->mode.hsync_start;
>> +       dsp_sty = dest.y1 + crtc->mode.vtotal - crtc->mode.vsync_start;
> This change could be split into separate patch, which actually fixes
> the coordinates used for this calculation, because that's why we do
> clipping with drm_plane_helper_check_update() first to use dest not
> crtc_{x,y}.
OK
>> -       offset = (src.x1 >> 16) * (fb->bits_per_pixel >> 3);
>> +       offset = (src.x1 >> 16) * drm_format_plane_cpp(fb->pixel_format, 0);
>>          offset += (src.y1 >> 16) * fb->pitches[0];
>> -       yrgb_mst = rk_obj->dma_addr + offset;
>>
>> +       yrgb_mst = rk_obj->dma_addr + offset + fb->offsets[0];
> This (missing offsets[0] addition) should also be a separate patch,
> because it was obviously incorrect before this patch.
OK.
>
> Best regards,
> Tomasz
>
>
>


-- 
Ｍark Yao


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