[PATCH v2 4/6] drm/msm/dsi: add a comment to explain pkt_per_line encoding

Jonathan Marek
2023-11-14T23:00:50Z

Make it clear why the pkt_per_line value is being "divided by 2".

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
---
drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 66f198e21a7e..842765063b1b 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -877,6 +877,8 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
/* DSI_VIDEO_COMPRESSION_MODE & DSI_COMMAND_COMPRESSION_MODE
* registers have similar offsets, so for below common code use
* DSI_VIDEO_COMPRESSION_MODE_XXXX for setting bits
+ *
+ * pkt_per_line is log2 encoded, >>1 works for supported values (1,2,4)
*/
reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_PKT_PER_LINE(pkt_per_line >> 1);
reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EOL_BYTE_NUM(eol_byte_num);
--
2.26.1