drm/msm: Add MSM-specific DSC helper methods
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>
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved
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*
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* Helper methods for MSM-specific DSC calculations that are common between timing engine,
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* DSI, and DP.
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*/
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#ifndef MSM_DSC_HELPER_H_
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#define MSM_DSC_HELPER_H_
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#include <linux/math.h>
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#include <drm/display/drm_dsc_helper.h>
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/**
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* msm_dsc_get_slices_per_intf() - calculate number of slices per interface
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* @dsc: Pointer to drm dsc config struct
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* @intf_width: interface width in pixels
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* Returns: Integer representing the number of slices for the given interface
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*/
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static inline u32 msm_dsc_get_slices_per_intf(const struct drm_dsc_config *dsc, u32 intf_width)
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{
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return DIV_ROUND_UP(intf_width, dsc->slice_width);
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}
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/**
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* msm_dsc_get_bytes_per_line() - calculate bytes per line
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* @dsc: Pointer to drm dsc config struct
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* Returns: Integer value representing bytes per line. DSI and DP need
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* to perform further calculations to turn this into pclk_per_intf,
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* such as dividing by different values depending on if widebus is enabled.
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*/
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static inline u32 msm_dsc_get_bytes_per_line(const struct drm_dsc_config *dsc)
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{
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return dsc->slice_count * dsc->slice_chunk_size;
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}
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#endif /* MSM_DSC_HELPER_H_ */
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