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([2a01:e0a:106d:1080:b416:50ee:20e:8775]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fc1ce408sm22191375e9.14.2026.04.17.01.03.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Apr 2026 01:03:42 -0700 (PDT) Message-ID: <858eba40-5e7a-4dc2-89cc-a6cd81ac189c@linaro.org> Date: Fri, 17 Apr 2026 10:03:41 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: Neil Armstrong Subject: Re: [PATCH RFC 1/7] media: qcom: iris: add QC10C & P010 buffer size calculations To: Dikshita Agarwal , Vikash Garodia , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260408-topic-sm8x50-iris-10bit-decoding-v1-0-428c1ec2e3f3@linaro.org> <20260408-topic-sm8x50-iris-10bit-decoding-v1-1-428c1ec2e3f3@linaro.org> <0afa05c9-1cbe-88b6-32d6-f65813391817@oss.qualcomm.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/17/26 08:47, Dikshita Agarwal wrote: > > > On 4/8/2026 10:13 PM, Neil Armstrong wrote: >> The P010 (YUV format with 16-bits per pixel with interleaved UV) >> and QC10C (P010 compressed mode similar to QC08C) requires specific >> buffer calculations to allocate the right buffer size for DPB frames >> and frames consumed by userspace. >> >> Similar to 8bit, the 10bit DPB frames uses QC10C format. >> >> Signed-off-by: Neil Armstrong >> --- >> drivers/media/platform/qcom/iris/iris_buffer.c | 81 +++++++++++++++++++++++++- >> 1 file changed, 80 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/media/platform/qcom/iris/iris_buffer.c b/drivers/media/platform/qcom/iris/iris_buffer.c >> index 9151f43bc6b9..a0e31bff8f26 100644 >> --- a/drivers/media/platform/qcom/iris/iris_buffer.c >> +++ b/drivers/media/platform/qcom/iris/iris_buffer.c >> @@ -15,7 +15,9 @@ >> #define MAX_WIDTH 4096 >> #define MAX_HEIGHT 2304 >> #define Y_STRIDE_ALIGN 128 >> +#define Y_STRIDE_ALIGN_P010 256 >> #define UV_STRIDE_ALIGN 128 >> +#define UV_STRIDE_ALIGN_P010 256 >> #define Y_SCANLINE_ALIGN 32 >> #define UV_SCANLINE_ALIGN 16 >> #define UV_SCANLINE_ALIGN_QC08C 32 >> @@ -80,6 +82,26 @@ static u32 iris_yuv_buffer_size_nv12(struct iris_inst *inst) >> return ALIGN(y_plane + uv_plane, PIXELS_4K); >> } >> >> +static u32 iris_yuv_buffer_size_p010(struct iris_inst *inst) >> +{ >> + u32 y_plane, uv_plane, y_stride, uv_stride, y_scanlines, uv_scanlines; >> + struct v4l2_format *f; >> + >> + if (inst->domain == DECODER) >> + f = inst->fmt_dst; >> + else >> + f = inst->fmt_src; >> + >> + y_stride = ALIGN(f->fmt.pix_mp.width * 2, Y_STRIDE_ALIGN_P010); >> + uv_stride = ALIGN(f->fmt.pix_mp.width * 2, UV_STRIDE_ALIGN_P010); >> + y_scanlines = ALIGN(f->fmt.pix_mp.height, Y_SCANLINE_ALIGN); >> + uv_scanlines = ALIGN((f->fmt.pix_mp.height + 1) >> 1, UV_SCANLINE_ALIGN); >> + y_plane = y_stride * y_scanlines; >> + uv_plane = uv_stride * uv_scanlines; >> + >> + return ALIGN(y_plane + uv_plane, PIXELS_4K); >> +} >> + >> /* >> * QC08C: >> * Compressed Macro-tile format for NV12. >> @@ -204,6 +226,55 @@ static u32 iris_yuv_buffer_size_qc08c(struct iris_inst *inst) >> return ALIGN(y_meta_plane + y_plane + uv_meta_plane + uv_plane, PIXELS_4K); >> } >> >> +/* >> + * QC10C: >> + * Compressed Macro-tile format for TP10. >> + */ >> +static u32 iris_yuv_buffer_size_qc10c(struct iris_inst *inst) >> +{ >> + u32 y_stride, y_buf_height; >> + u32 uv_stride, uv_buf_height; >> + u32 y_md_stride, y_md_height; >> + u32 uv_md_stride, uv_md_height; >> + u32 y_data_size, uv_data_size; >> + u32 y_md_size, uv_md_size; >> + struct v4l2_format *f = NULL; >> + >> + if (inst->domain == DECODER) >> + f = inst->fmt_dst; >> + else >> + f = inst->fmt_src; >> + >> + y_stride = ALIGN(ALIGN(f->fmt.pix_mp.width, 192) * 4 / 3, >> + Y_STRIDE_ALIGN_P010); > > Y_STRIDE_ALIGN_P010 is being used for both P010 and QC10C, lets keep it > Y_STRIDE_ALIGN_10_BIT ? or something similar ? > >> + y_buf_height = ALIGN(f->fmt.pix_mp.height, UV_SCANLINE_ALIGN); > > why not call it y_scanlines only? > >> + >> + y_data_size = ALIGN(y_stride * y_buf_height, PIXELS_4K); > > s/y_data_size/y_plane ? > >> + >> + uv_stride = ALIGN(ALIGN(f->fmt.pix_mp.width, 192) * 4 / 3, >> + UV_STRIDE_ALIGN_P010); >> + uv_buf_height = ALIGN((f->fmt.pix_mp.height + 1) / 2, >> + UV_SCANLINE_ALIGN); > > s/uv_buf_height/uv_scanline? > >> + >> + uv_data_size = ALIGN(uv_stride * uv_buf_height, PIXELS_4K); > > s/uv_data_size/uv_plane? > > Pls keep all these names consistent with other functions, applies to below > variables as well. > > > Thanks, > Dikshita > >> + >> + y_md_stride = ALIGN(DIV_ROUND_UP(f->fmt.pix_mp.width, 48), >> + META_STRIDE_ALIGNED); >> + y_md_height = ALIGN(DIV_ROUND_UP(f->fmt.pix_mp.height, 4), >> + META_SCANLINE_ALIGNED); >> + >> + y_md_size = ALIGN(y_md_stride * y_md_height, PIXELS_4K); >> + >> + uv_md_stride = ALIGN(DIV_ROUND_UP((f->fmt.pix_mp.width + 1) / 2, 24), >> + META_STRIDE_ALIGNED); >> + uv_md_height = ALIGN(DIV_ROUND_UP((f->fmt.pix_mp.height + 1) / 2, 4), >> + META_SCANLINE_ALIGNED); >> + >> + uv_md_size = ALIGN(uv_md_stride * uv_md_height, PIXELS_4K); >> + >> + return y_data_size + uv_data_size + y_md_size + uv_md_size; >> +} >> + >> static u32 iris_dec_bitstream_buffer_size(struct iris_inst *inst) >> { >> struct platform_inst_caps *caps = inst->core->iris_platform_data->inst_caps; >> @@ -268,10 +339,18 @@ int iris_get_buffer_size(struct iris_inst *inst, >> case BUF_OUTPUT: >> if (inst->fmt_dst->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_QC08C) >> return iris_yuv_buffer_size_qc08c(inst); >> + else if (inst->fmt_dst->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_QC10C) >> + return iris_yuv_buffer_size_qc10c(inst); >> + else if (inst->fmt_dst->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_P010) >> + return iris_yuv_buffer_size_p010(inst); >> else >> return iris_yuv_buffer_size_nv12(inst); >> case BUF_DPB: >> - return iris_yuv_buffer_size_qc08c(inst); >> + if (inst->fmt_dst->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_QC10C || >> + inst->fmt_dst->fmt.pix_mp.pixelformat == V4L2_PIX_FMT_P010) > > Please introduce one API, is_10bit_format and use that here instead. Ack > > Thanks, > Dikshita >> + return iris_yuv_buffer_size_qc10c(inst); >> + else >> + return iris_yuv_buffer_size_qc08c(inst); >> default: >> return 0; >> } >>