The patch titled
viafb: reduce I2C timeout and delay
has been added to the -mm tree. Its filename is
viafb-reduce-i2c-timeout-and-delay.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: viafb: reduce I2C timeout and delay
From: Florian Tobias Schandinat <FlorianSchandinat@xxxxxx>
Reduce the value for I2C timeout and udelay.
The udelay was reduced to 10 (old: 40) which is still very high as for
standard-mode I2C even 5 should work. This gives a speedup of factor 4
when talking to I2C devices.
The timeout was reduced to 2 (old: 20) which is taken from the radeon
driver so it should work as well. This gives a speedup of factor 10 when
detecting that there is no I2C device we want to talk to. This causes a
huge improvement of device initialization time.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@xxxxxx>
Cc: Joseph Chan <JosephChan@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/via/via_i2c.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN drivers/video/via/via_i2c.c~viafb-reduce-i2c-timeout-and-delay drivers/video/via/via_i2c.c
--- a/drivers/video/via/via_i2c.c~viafb-reduce-i2c-timeout-and-delay
+++ a/drivers/video/via/via_i2c.c
@@ -202,8 +202,8 @@ static int create_i2c_bus(struct i2c_ada
algo->setscl = via_i2c_setscl;
algo->getsda = via_i2c_getsda;
algo->getscl = via_i2c_getscl;
- algo->udelay = 40;
- algo->timeout = 20;
+ algo->udelay = 10;
+ algo->timeout = 2;
algo->data = adap_cfg;
sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
_
Patches currently in -mm which might be from FlorianSchandinat@xxxxxx are
linux-next.patch
viafb-add-interface-for-output-device-configuration.patch
viafb-limit-lcd-code-impact.patch
viafb-introduce-per-output-device-power-management.patch
viafb-vt1636-cleanup.patch
viafb-fix-i2c_transfer-error-handling.patch
viafb-enable-i2c-for-crt.patch
viafb-reduce-i2c-timeout-and-delay.patch
viafb-add-function-to-change-sync-polarity-per-device.patch
viafb-set-sync-polarity-for-all-output-devices.patch
viafb-add-a-mapping-of-supported-output-devices.patch
viafb-rename-output-devices.patch
viafb-add-documentation-for-proc-interface.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
