[libcamera-devel] [PATCH v5 2/6] ipa: ipu3: Inline fillParams() in fillParamsBuffer()

[paul.elder at ideasonboard.com]

Hi Umang,

On Wed, Apr 06, 2022 at 07:47:05PM +0530, Umang Jain via libcamera-devel wrote:
> Since we have moved away from switch/case on the operation ID,
> there's little reason to split the operation in two functions.
> 
> Signed-off-by: Umang Jain <umang.jain at ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>

> ---
>  src/ipa/ipu3/ipu3.cpp | 47 +++++++++++++++++--------------------------
>  1 file changed, 18 insertions(+), 29 deletions(-)
> 
> diff --git a/src/ipa/ipu3/ipu3.cpp b/src/ipa/ipu3/ipu3.cpp
> index 9a59f80f..8c9a20f5 100644
> --- a/src/ipa/ipu3/ipu3.cpp
> +++ b/src/ipa/ipu3/ipu3.cpp
> @@ -156,7 +156,6 @@ private:
>  			    ControlInfoMap *ipaControls);
>  	void updateSessionConfiguration(const ControlInfoMap &sensorControls);
>  
> -	void fillParams(unsigned int frame, ipu3_uapi_params *params);
>  	void parseStatistics(unsigned int frame,
>  			     int64_t frameTimestamp,
>  			     const ipu3_uapi_stats_3a *stats);
> @@ -513,6 +512,9 @@ void IPAIPU3::unmapBuffers(const std::vector<unsigned int> &ids)
>   * \brief Fill and return a buffer with ISP processing parameters for a frame
>   * \param[in] frame The frame number
>   * \param[in] bufferId ID of the parameter buffer to fill
> + *
> + * Algorithms are expected to fill the IPU3 parameter buffer for the next
> + * frame given their most recent processing of the ImgU statistics.
>   */
>  void IPAIPU3::fillParamsBuffer(const uint32_t frame, const uint32_t bufferId)
>  {
> @@ -526,7 +528,21 @@ void IPAIPU3::fillParamsBuffer(const uint32_t frame, const uint32_t bufferId)
>  	ipu3_uapi_params *params =
>  		reinterpret_cast<ipu3_uapi_params *>(mem.data());
>  
> -	fillParams(frame, params);
> +	/*
> +	 * The incoming params buffer may contain uninitialised data, or the
> +	 * parameters of previously queued frames. Clearing the entire buffer
> +	 * may be an expensive operation, and the kernel will only read from
> +	 * structures which have their associated use-flag set.
> +	 *
> +	 * It is the responsibility of the algorithms to set the use flags
> +	 * accordingly for any data structure they update during prepare().
> +	 */
> +	params->use = {};
> +
> +	for (auto const &algo : algorithms_)
> +		algo->prepare(context_, params);
> +
> +	paramsBufferReady.emit(frame);
>  }
>  
>  /**
> @@ -569,33 +585,6 @@ void IPAIPU3::queueRequest(const uint32_t frame,
>  	/* \todo Start processing for 'frame' based on 'controls'. */
>  }
>  
> -/**
> - * \brief Fill the ImgU parameter buffer for the next frame
> - * \param[in] frame The number of the latest frame processed
> - * \param[out] params The parameter buffer to fill
> - *
> - * Algorithms are expected to fill the IPU3 parameter buffer for the next
> - * frame given their most recent processing of the ImgU statistics.
> - */
> -void IPAIPU3::fillParams(unsigned int frame, ipu3_uapi_params *params)
> -{
> -	/*
> -	 * The incoming params buffer may contain uninitialised data, or the
> -	 * parameters of previously queued frames. Clearing the entire buffer
> -	 * may be an expensive operation, and the kernel will only read from
> -	 * structures which have their associated use-flag set.
> -	 *
> -	 * It is the responsibility of the algorithms to set the use flags
> -	 * accordingly for any data structure they update during prepare().
> -	 */
> -	params->use = {};
> -
> -	for (auto const &algo : algorithms_)
> -		algo->prepare(context_, params);
> -
> -	paramsBufferReady.emit(frame);
> -}
> -
>  /**
>   * \brief Process the statistics generated by the ImgU
>   * \param[in] frame The number of the latest frame processed
> -- 
> 2.31.0
>