From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + viafb-reduce-i2c-timeout-and-delay.patch added to -mm tree Date: Tue, 21 Sep 2010 15:37:15 -0700 Message-ID: <201009212237.o8LMbFI7006801@imap1.linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:56289 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752257Ab0IUWht (ORCPT ); Tue, 21 Sep 2010 18:37:49 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org Cc: FlorianSchandinat@gmx.de, JosephChan@via.com.tw, corbet@lwn.net 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 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 Cc: Joseph Chan Cc: Jonathan Corbet Signed-off-by: Andrew Morton --- 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@gmx.de 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