drm/msm/dsi: Flip greater-than check for slice_count and slice_per_intf

[ Upstream commit 82e72fd22a8f9eff4e75c08be68319008ea90a29 ]

According to downstream /and the comment copied from it/ this comparison
should be the other way around.  In other words, when the panel driver
requests to use more slices per packet than what could be sent over this
interface, it is bumped down to only use a single slice per packet (and
strangely not the number of slices that could fit on the interface).

Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration")
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/515686/
Link: https://lore.kernel.org/r/20221221231943.1961117-4-marijn.suijten@somainline.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Stable-dep-of: 155fa3a91d64 ("drm/msm/dsi: Remove incorrect references to slice_count")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 5ab5e87..ef988e4 100644 (file)
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -853,11 +853,12 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod
         */
        slice_per_intf = DIV_ROUND_UP(hdisplay, dsc->slice_width);
 
-       /* If slice_per_pkt is greater than slice_per_intf
+       /*
+        * If slice_count is greater than slice_per_intf
         * then default to 1. This can happen during partial
         * update.
         */
-       if (slice_per_intf > dsc->slice_count)
+       if (dsc->slice_count > slice_per_intf)
                dsc->slice_count = 1;
 
        total_bytes_per_intf = dsc->slice_chunk_size * slice_per_intf;