linux-kernel - Re: [PATCH v2 16/23] media: iris: Add a comment to explain usage of MBPS

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Message-ID: <17de7cb5-94a2-44c4-b306-e18e983f9d84@quicinc.com>
Date: Tue, 29 Apr 2025 16:04:28 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        Hans Verkuil
	<hverkuil@...all.nl>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        Nicolas Dufresne
	<nicolas.dufresne@...labora.com>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 16/23] media: iris: Add a comment to explain usage of
 MBPS


On 4/28/2025 2:59 PM, Dikshita Agarwal wrote:
> Add a comment to explain usage of MBPS and define a macro for 8K
> resolution for better readability
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
>  drivers/media/platform/qcom/iris/iris_platform_common.h | 2 ++
>  drivers/media/platform/qcom/iris/iris_platform_gen2.c   | 4 ++--
>  drivers/media/platform/qcom/iris/iris_platform_sm8250.c | 2 +-
>  3 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
> index 1dab276431c7..3e0ae87526a0 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_common.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
> @@ -21,6 +21,7 @@ struct iris_inst;
>  #define DEFAULT_MAX_HOST_BUF_COUNT		64
>  #define DEFAULT_MAX_HOST_BURST_BUF_COUNT	256
>  #define DEFAULT_FPS				30
> +#define NUM_MBS_8K				((8192 * 4352) / 256)
>  
>  enum stage_type {
>  	STAGE_1 = 1,
> @@ -172,6 +173,7 @@ struct iris_platform_data {
>  	struct ubwc_config_data *ubwc_config;
>  	u32 num_vpp_pipe;
>  	u32 max_session_count;
> +	/* max number of macroblocks per frame supported */
>  	u32 max_core_mbpf;
>  	const u32 *input_config_params;
>  	unsigned int input_config_params_size;
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen2.c b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> index 1e69ba15db0f..deb7037e8e86 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> @@ -248,7 +248,7 @@ struct iris_platform_data sm8550_data = {
>  	.ubwc_config = &ubwc_config_sm8550,
>  	.num_vpp_pipe = 4,
>  	.max_session_count = 16,
> -	.max_core_mbpf = ((8192 * 4352) / 256) * 2,
> +	.max_core_mbpf = NUM_MBS_8K * 2,
>  	.input_config_params =
>  		sm8550_vdec_input_config_params,
>  	.input_config_params_size =
> @@ -308,7 +308,7 @@ struct iris_platform_data sm8650_data = {
>  	.ubwc_config = &ubwc_config_sm8550,
>  	.num_vpp_pipe = 4,
>  	.max_session_count = 16,
> -	.max_core_mbpf = ((8192 * 4352) / 256) * 2,
> +	.max_core_mbpf = NUM_MBS_8K * 2,
>  	.input_config_params =
>  		sm8550_vdec_input_config_params,
>  	.input_config_params_size =
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_sm8250.c b/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> index 543fa2661539..8183e4e95fa4 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> @@ -127,7 +127,7 @@ struct iris_platform_data sm8250_data = {
>  	.hw_response_timeout = HW_RESPONSE_TIMEOUT_VALUE,
>  	.num_vpp_pipe = 4,
>  	.max_session_count = 16,
> -	.max_core_mbpf = (8192 * 4352) / 256,
> +	.max_core_mbpf = NUM_MBS_8K,
>  	.input_config_params =
>  		sm8250_vdec_input_config_param_default,
>  	.input_config_params_size =
> 
Acked-by: Vikash Garodia <quic_vgarodia@...cinc.com>