The patch titled
cirrusfb: fix clock doubling
has been removed from the -mm tree. Its filename was
cirrusfb-fix-clock-doubling.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cirrusfb: fix clock doubling
From: Krzysztof Helt <krzysztof.h1@xxxxx>
Cirrus' Alpine and Picasso4 chips uses DAC clock doubling to achieve full
range of pixclock frequencies.
[akpm@xxxxxxxxxxxxxxxxxxxx: fix spelling, use usual comment layout]
Signed-off-by: Krzysztof Helt <krzysztof.h1@xxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/cirrusfb.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff -puN drivers/video/cirrusfb.c~cirrusfb-fix-clock-doubling drivers/video/cirrusfb.c
--- a/drivers/video/cirrusfb.c~cirrusfb-fix-clock-doubling
+++ a/drivers/video/cirrusfb.c
@@ -470,10 +470,25 @@ static int cirrusfb_check_pixclock(const
/* If the frequency is greater than we can support, we might be able
* to use multiplexing for the video mode */
if (freq > maxclock) {
+ dev_err(info->device,
+ "Frequency greater than maxclock (%ld kHz)\n",
+ maxclock);
+ return -EINVAL;
+ }
+ /*
+ * Additional constraint: 8bpp uses DAC clock doubling to allow maximum
+ * pixel clock
+ */
+ if (var->bits_per_pixel == 8) {
switch (cinfo->btype) {
case BT_ALPINE:
+ case BT_PICASSO4:
+ if (freq > 85500)
+ cinfo->multiplexing = 1;
+ break;
case BT_GD5480:
- cinfo->multiplexing = 1;
+ if (freq > 135100)
+ cinfo->multiplexing = 1;
break;
default:
@@ -815,6 +830,8 @@ static int cirrusfb_set_par_foo(struct f
freq = PICOS2KHZ(var->pixclock);
if (cinfo->btype == BT_ALPINE && var->bits_per_pixel == 24)
freq *= 3;
+ if (cinfo->multiplexing)
+ freq /= 2;
bestclock(freq, &nom, &den, &div);
_
Patches currently in -mm which might be from krzysztof.h1@xxxxx are
origin.patch
linux-next.patch
tdfxfb-move-i2c-functionality-into-the-tdfxfb.patch
tdfxfb-make-use-of-ddc-information-about-connected-monitor.patch
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