The patch titled
drivers/video/i810/i810-i2c.c: fix i2c bus handling
has been removed from the -mm tree. Its filename was
drivers-video-i810-i810-i2cc-fix-i2c-bus-handling.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: drivers/video/i810/i810-i2c.c: fix i2c bus handling
From: Stefani Seibold <stefani@xxxxxxxxxxx>
Fix a longstanding bug in the i810 frame buffer driver.
The handling of the i2c bus is wrong: A 1 bit should not written to the
i2c, these will be done by switch the i2c to input. Driving an 1 bit
active is against the i2c spec.
An active driven of a 1 bit will result in very strange error, depending
which side is the more powerful one. In my case it depends on the
temperature of the Display-Controller-EEprom: With an cold eprom a got the
correct EDID datas, with a warm one some of the 1 bits was 0 :-(
The same bug is also in the intelfb driver in the file
drivers/video/intelfb/intelfb_i2c.c. The functions intelfb_gpio_setscl()
and intelfb_gpio_setsda() do drive the 1 bit active to the i2c bus. But
since i have no card which is used by the intelfb driver i cannot fix it.
Signed-off-by: Stefani Seibold <stefani@xxxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/i810/i810-i2c.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff -puN drivers/video/i810/i810-i2c.c~drivers-video-i810-i810-i2cc-fix-i2c-bus-handling drivers/video/i810/i810-i2c.c
--- a/drivers/video/i810/i810-i2c.c~drivers-video-i810-i810-i2cc-fix-i2c-bus-handling
+++ a/drivers/video/i810/i810-i2c.c
@@ -45,8 +45,10 @@ static void i810i2c_setscl(void *data, i
struct i810fb_par *par = chan->par;
u8 __iomem *mmio = par->mmio_start_virtual;
- i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
- SCL_DIR_MASK | SCL_VAL_MASK);
+ if (state)
+ i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK | SCL_VAL_MASK);
+ else
+ i810_writel(mmio, chan->ddc_base, SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
i810_readl(mmio, chan->ddc_base); /* flush posted write */
}
@@ -56,8 +58,10 @@ static void i810i2c_setsda(void *data, i
struct i810fb_par *par = chan->par;
u8 __iomem *mmio = par->mmio_start_virtual;
- i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
- SDA_DIR_MASK | SDA_VAL_MASK);
+ if (state)
+ i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK | SDA_VAL_MASK);
+ else
+ i810_writel(mmio, chan->ddc_base, SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
i810_readl(mmio, chan->ddc_base); /* flush posted write */
}
_
Patches currently in -mm which might be from stefani@xxxxxxxxxxx are
origin.patch
cramfs-generate-unique-inode-number-for-better-inode-cache-usage.patch
cramfs-generate-unique-inode-number-for-better-inode-cache-usage-fix.patch
cramfs-generate-unique-inode-number-for-better-inode-cache-usage-checkpatch-fixes.patch
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