drm/bridge: tc358767: fix max_tu_symbol value

[sfrench/cifs-2.6.git] / drivers / gpu / drm / bridge / tc358767.c

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index cebc8e6208208815b9334671ee13b958516d54d9..8a8d605021f04e873118414ea4e13d19a400815d 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -728,6 +728,8 @@ static int tc_set_video_mode(struct tc_data *tc,
        int lower_margin = mode->vsync_start - mode->vdisplay;
        int vsync_len = mode->vsync_end - mode->vsync_start;
        u32 dp0_syncval;
+       u32 bits_per_pixel = 24;
+       u32 in_bw, out_bw;
 
        /*
         * Recommended maximum number of symbols transferred in a transfer unit:
@@ -735,7 +737,10 @@ static int tc_set_video_mode(struct tc_data *tc,
         *              (output active video bandwidth in bytes))
         * Must be less than tu_size.
         */
-       max_tu_symbol = TU_SIZE_RECOMMENDED - 1;
+
+       in_bw = mode->clock * bits_per_pixel / 8;
+       out_bw = tc->link.base.num_lanes * tc->link.base.rate;
+       max_tu_symbol = DIV_ROUND_UP(in_bw * TU_SIZE_RECOMMENDED, out_bw);
 
        dev_dbg(tc->dev, "set mode %dx%d\n",
                mode->hdisplay, mode->vdisplay);