Re: [PATCH v4 6/7] media: venus: helpers: update NUM_MBS macro calculation

Stanimir Varbanov
2021-10-01T21:31:15Z

Hi,

On 8/10/21 12:47 PM, Dikshita Agarwal wrote:
> Consider alignment while calculating NUM_MBS.
>
> Co-developed-by: Mansur Alisha Shaik <mansur@codeaurora.org>
> Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
> ---
> drivers/media/platform/qcom/venus/helpers.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index 60a2775..2db33ba 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -18,8 +18,8 @@
> #include "hfi_platform.h"
> #include "hfi_parser.h"
>
> -#define NUM_MBS_720P (((1280 + 15) >> 4) * ((720 + 15) >> 4))
> -#define NUM_MBS_4K (((4096 + 15) >> 4) * ((2304 + 15) >> 4))
> +#define NUM_MBS_720P (((ALIGN(1280, 16)) >> 4) * ((ALIGN(736, 16)) >> 4))
> +#define NUM_MBS_4K (((ALIGN(4096, 16)) >> 4) * ((ALIGN(2304, 16)) >> 4))
>
> struct intbuf {
> struct list_head list;
> @@ -1098,16 +1098,17 @@ static u32 venus_helper_get_work_mode(struct venus_inst *inst)
> u32 num_mbs;
>
> mode = VIDC_WORK_MODE_2;
> +
> if (inst->session_type == VIDC_SESSION_TYPE_DEC) {
> - num_mbs = (ALIGN(inst->height, 16) * ALIGN(inst->width, 16)) / 256;
> + num_mbs = ((ALIGN(inst->height, 16))/16 * (ALIGN(inst->width, 16)))/16;

Could you help me understand what is the difference between both
calculations? IMO this patch should only change NUM_MBS_720P and
NUM_MBS_4K macros.

> if (inst->hfi_codec == HFI_VIDEO_CODEC_MPEG2 ||
> - inst->pic_struct != HFI_INTERLACE_FRAME_PROGRESSIVE ||
> - num_mbs <= NUM_MBS_720P)
> + inst->pic_struct != HFI_INTERLACE_FRAME_PROGRESSIVE ||
> + num_mbs <= NUM_MBS_720P)

This change just makes indentation wrong and also it is not related to
the patch subject.

> mode = VIDC_WORK_MODE_1;
> } else {
> num_mbs = (ALIGN(inst->out_height, 16) * ALIGN(inst->out_width, 16)) / 256;
> if (inst->hfi_codec == HFI_VIDEO_CODEC_VP8 &&
> - num_mbs <= NUM_MBS_4K)
> + num_mbs <= NUM_MBS_4K)

ditto

> mode = VIDC_WORK_MODE_1;
> }
>
>

--
regards,
Stan