Re: [PATCH] media: s5p-mfc: Corrected NV12M/NV21M plane-sizes
From: Nicolas Dufresne <hidden>
Date: 2024-08-06 14:37:57
Also in:
linux-media, linux-samsung-soc, lkml
Hi Jain, I haven't dig much, but I have a quick question below. Le mardi 06 août 2024 à 17:27 +0530, Aakarsh Jain a écrit :
There is a possibility of getting page fault if the overall buffer size is not aligned to 256bytes. Since MFC does read operation only and it won't corrupt the data values even if it reads the extra bytes. Corrected luma and chroma plane sizes for V4L2_PIX_FMT_NV12M and V4L2_PIX_FMT_NV21M pixel format.
Have you re-run v4l2 compliance ? (better be safe then sorry).
quoted hunk ↗ jump to hunk
Signed-off-by: Aakarsh Jain <redacted> --- .../media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c index 73f7af674c01..03c957221fc4 100644 --- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c +++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c@@ -498,8 +498,8 @@ static void s5p_mfc_dec_calc_dpb_size_v6(struct s5p_mfc_ctx *ctx) case V4L2_PIX_FMT_NV21M: ctx->stride[0] = ALIGN(ctx->img_width, S5P_FIMV_NV12MT_HALIGN_V6); ctx->stride[1] = ALIGN(ctx->img_width, S5P_FIMV_NV12MT_HALIGN_V6); - ctx->luma_size = calc_plane(ctx->stride[0], ctx->img_height); - ctx->chroma_size = calc_plane(ctx->stride[1], (ctx->img_height / 2)); + ctx->luma_size = calc_plane(ctx->img_width, ctx->img_height); + ctx->chroma_size = calc_plane(ctx->img_width, (ctx->img_height >> 1));
These size needs to match the sizes reported through TRY_FMT (and S_FMT) sizeimage for each planes. Is this code being call withing try_fmt ? Will these value match or will this change cause the value to miss-match ? The reason is that correct value is needed for allocating this memory from the outside (like using a DMAbuf Heap). Perhaps its all right, let me know. Nicolas
quoted hunk ↗ jump to hunk
break; case V4L2_PIX_FMT_YUV420M: case V4L2_PIX_FMT_YVU420M:@@ -539,9 +539,11 @@ static void s5p_mfc_dec_calc_dpb_size_v6(struct s5p_mfc_ctx *ctx) static void s5p_mfc_enc_calc_src_size_v6(struct s5p_mfc_ctx *ctx) { unsigned int mb_width, mb_height; + unsigned int default_size; mb_width = MB_WIDTH(ctx->img_width); mb_height = MB_HEIGHT(ctx->img_height); + default_size = (mb_width * mb_height) * 256; if (IS_MFCV12(ctx->dev)) { switch (ctx->src_fmt->fourcc) {@@ -549,8 +551,8 @@ static void s5p_mfc_enc_calc_src_size_v6(struct s5p_mfc_ctx *ctx) case V4L2_PIX_FMT_NV21M: ctx->stride[0] = ALIGN(ctx->img_width, S5P_FIMV_NV12M_HALIGN_V6); ctx->stride[1] = ALIGN(ctx->img_width, S5P_FIMV_NV12M_HALIGN_V6); - ctx->luma_size = ctx->stride[0] * ALIGN(ctx->img_height, 16); - ctx->chroma_size = ctx->stride[0] * ALIGN(ctx->img_height / 2, 16); + ctx->luma_size = ALIGN(default_size, 256); + ctx->chroma_size = ALIGN(default_size / 2, 256); break; case V4L2_PIX_FMT_YUV420M: case V4L2_PIX_FMT_YVU420M: