| Message ID | 20221005181657.784375-5-marijn.suijten@somainline.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/msm: Fix math issues in MSM DSC implementation | expand |
On 10/5/2022 11:16 AM, Marijn Suijten wrote: > dsi_populate_dsc_params() is called prior to dsi_update_dsc_timing() and > already computes a value for slice_chunk_size, whose value doesn't need > to be recomputed and re-set here. > > Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration") > Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> > --- > drivers/gpu/drm/msm/dsi/dsi_host.c | 9 ++------- > 1 file changed, 2 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c > index 48c966375ffa..f42794cdd4c1 100644 > --- a/drivers/gpu/drm/msm/dsi/dsi_host.c > +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c > @@ -845,7 +845,6 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod > u32 reg, reg_ctrl, reg_ctrl2; > u32 slice_per_intf, total_bytes_per_intf; > u32 pkt_per_line; > - u32 bytes_in_slice; > u32 eol_byte_num; > > /* first calculate dsc parameters and then program > @@ -860,11 +859,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod > if (slice_per_intf > dsc->slice_count) > dsc->slice_count = 1; > > - bytes_in_slice = DIV_ROUND_UP(dsc->slice_width * dsc->bits_per_pixel, 8); > - > - dsc->slice_chunk_size = bytes_in_slice; > - > - total_bytes_per_intf = bytes_in_slice * slice_per_intf; > + total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf; > > eol_byte_num = total_bytes_per_intf % 3; > pkt_per_line = slice_per_intf / dsc->slice_count; > @@ -890,7 +885,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod > reg_ctrl |= reg; > > reg_ctrl2 &= ~DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH__MASK; > - reg_ctrl2 |= DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH(bytes_in_slice); > + reg_ctrl2 |= DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH(dsc->slice_chunk_size); > > dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL, reg_ctrl); > dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2, reg_ctrl2);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 48c966375ffa..f42794cdd4c1 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -845,7 +845,6 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod u32 reg, reg_ctrl, reg_ctrl2; u32 slice_per_intf, total_bytes_per_intf; u32 pkt_per_line; - u32 bytes_in_slice; u32 eol_byte_num; /* first calculate dsc parameters and then program @@ -860,11 +859,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod if (slice_per_intf > dsc->slice_count) dsc->slice_count = 1; - bytes_in_slice = DIV_ROUND_UP(dsc->slice_width * dsc->bits_per_pixel, 8); - - dsc->slice_chunk_size = bytes_in_slice; - - total_bytes_per_intf = bytes_in_slice * slice_per_intf; + total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf; eol_byte_num = total_bytes_per_intf % 3; pkt_per_line = slice_per_intf / dsc->slice_count; @@ -890,7 +885,7 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod reg_ctrl |= reg; reg_ctrl2 &= ~DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH__MASK; - reg_ctrl2 |= DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH(bytes_in_slice); + reg_ctrl2 |= DSI_COMMAND_COMPRESSION_MODE_CTRL2_STREAM0_SLICE_WIDTH(dsc->slice_chunk_size); dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL, reg_ctrl); dsi_write(msm_host, REG_DSI_COMMAND_COMPRESSION_MODE_CTRL2, reg_ctrl2);
dsi_populate_dsc_params() is called prior to dsi_update_dsc_timing() and already computes a value for slice_chunk_size, whose value doesn't need to be recomputed and re-set here. Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration") Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> --- drivers/gpu/drm/msm/dsi/dsi_host.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-)