fbdev: sh_mobile_lcdc: Compute clock pattern using divider denominator

The clock divider pattern is computed based on the dot clock register
value which stores the divider denumerator. However, when using a 1:1
divider ratio, the register is programmed with a value that must not be
interpreted as a denominator. This results in a shift left operation
with a value of 32, which produces undefined behaviour.

Compute the clock pattern using the divider denominator, not the dot
clock register value.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 99656f5..2d935db 100644 (file)
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -481,13 +481,15 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
                if (!m)
                        continue;
 
+               /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
+                * denominator.
+                */
+               lcdc_write_chan(ch, LDDCKPAT1R, 0);
+               lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
+
                if (m == 1)
                        m = LDDCKR_MOSEL;
                tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
-
-               /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider denominator */
-               lcdc_write_chan(ch, LDDCKPAT1R, 0);
-               lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
        }
 
        lcdc_write(priv, _LDDCKR, tmp);