drm/i2c: tda998x: adjust the audio clock divider for S/PDIF

According to some tests on the Cubox (Marvell Armada 510 + TDA19988),
the S/PDIF input asks for a greater audio clock divider.

Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 666ee24329b9..d0f3a4cbb866 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -680,10 +680,14 @@ tda998x_configure_audio(struct tda998x_priv *priv,
          * There is no detailed info in the datasheet, so we just
          * assume 100MHz requires larger divider.
          */
+        adiv = AUDIO_DIV_SERCLK_8;
         if (mode->clock > 100000)
-                adiv = AUDIO_DIV_SERCLK_16;
-        else
-                adiv = AUDIO_DIV_SERCLK_8;
+                adiv++;                 /* AUDIO_DIV_SERCLK_16 */
+
+        /* S/PDIF asks for a larger divider */
+        if (p->audio_format == AFMT_SPDIF)
+                adiv++;                 /* AUDIO_DIV_SERCLK_16 or _32 */
+
         reg_write(priv, REG_AUDIO_DIV, adiv);
 
         /*