drm/i2c: tda998x: correct PLL divider calculation

The serializer PLL divider is a power-of-two divider, so our calculation
which assumes that it's a numerical divider is incorrect.  Replace it
with one that results in a power-of-two divider value instead.

Tested with all supported modes with a Samsung S24C750.

Tested-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 7313ff8..0df86e9 100644 (file)
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -1343,6 +1343,7 @@ static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
                                    struct drm_display_mode *adjusted_mode)
 {
        struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);
+       unsigned long tmds_clock;
        u16 ref_pix, ref_line, n_pix, n_line;
        u16 hs_pix_s, hs_pix_e;
        u16 vs1_pix_s, vs1_pix_e, vs1_line_s, vs1_line_e;
@@ -1413,12 +1414,19 @@ static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
                               (mode->vsync_end - mode->vsync_start)/2;
        }
 
-       div = 148500 / mode->clock;
-       if (div != 0) {
-               div--;
-               if (div > 3)
-                       div = 3;
-       }
+       tmds_clock = mode->clock;
+
+       /*
+        * The divisor is power-of-2. The TDA9983B datasheet gives
+        * this as ranges of Msample/s, which is 10x the TMDS clock:
+        *   0 - 800 to 1500 Msample/s
+        *   1 - 400 to 800 Msample/s
+        *   2 - 200 to 400 Msample/s
+        *   3 - as 2 above
+        */
+       for (div = 0; div < 3; div++)
+               if (80000 >> div <= tmds_clock)
+                       break;
 
        mutex_lock(&priv->audio_mutex);