diff mbox series

[v14,5/9] drm/msm: Add MSM-specific DSC helper methods

Message ID 20230329-rfc-msm-dsc-helper-v14-5-bafc7be95691@quicinc.com
State Accepted
Commit b50f06f83e0e859d93bd7bb80a2d1911f2dc176b
Headers show
Series None | expand

Commit Message

Jessica Zhang May 24, 2023, 5:45 p.m. UTC 
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>
---
 drivers/gpu/drm/msm/msm_dsc_helper.h | 38 ++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/msm_dsc_helper.h b/drivers/gpu/drm/msm/msm_dsc_helper.h
new file mode 100644
index 000000000000..b9049fe1e279
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_dsc_helper.h
@@ -0,0 +1,38 @@ 
+/* 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_ */