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drm/msm: Add MSM-specific DSC helper methods

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Introduce MSM-specific DSC helper methods, as some calculations are
common between DP and DSC.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539272/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-5-bafc7be95691@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Jessica Zhang 2023-05-24 10:45:18 -07:00 committed by Dmitry Baryshkov
parent 49fd30a715
commit b50f06f83e
1 changed files with 38 additions and 0 deletions
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38
drivers/gpu/drm/msm/msm_dsc_helper.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved
*
* Helper methods for MSM-specific DSC calculations that are common between timing engine,
* DSI, and DP.
*/
#ifndef MSM_DSC_HELPER_H_
#define MSM_DSC_HELPER_H_
#include <linux/math.h>
#include <drm/display/drm_dsc_helper.h>
/**
* msm_dsc_get_slices_per_intf() - calculate number of slices per interface
* @dsc: Pointer to drm dsc config struct
* @intf_width: interface width in pixels
* Returns: Integer representing the number of slices for the given interface
*/
static inline u32 msm_dsc_get_slices_per_intf(const struct drm_dsc_config *dsc, u32 intf_width)
{
return DIV_ROUND_UP(intf_width, dsc->slice_width);
}
/**
* msm_dsc_get_bytes_per_line() - calculate bytes per line
* @dsc: Pointer to drm dsc config struct
* Returns: Integer value representing bytes per line. DSI and DP need
* to perform further calculations to turn this into pclk_per_intf,
* such as dividing by different values depending on if widebus is enabled.
*/
static inline u32 msm_dsc_get_bytes_per_line(const struct drm_dsc_config *dsc)
{
return dsc->slice_count * dsc->slice_chunk_size;
}
#endif /* MSM_DSC_HELPER_H_ */