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Old 12-12-2008, 09:35 PM
Geert Stappers
 
Default Bug#508599: linux-image-2.6.26-1-686: Increase power_up delay to fix TI readers

Package: linux-image-2.6.26-1-686
Version: 2.6.26-11
Severity: normal
Tags: patch

Hello Kernel maintainers,

To get a SD cardreader working I needed to do

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 01ced4c..11f050c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -492,7 +492,7 @@ static void mmc_power_up(struct mmc_host *host)
* This delay must be at least 74 clock sizes, or 1 ms, or the
* time required to reach a stable voltage.
*/
- mmc_delay(2);
+ mmc_delay(10);
}

static void mmc_power_off(struct mmc_host *host)


I got that fix from Mandriva
http://svn.mandriva.com/cgi-bin/viewvc.cgi/packages/updates/2008.0/kernel-2.6/current/PATCHES/patches/DB35_mmc_power_up_delay.patch?view=markup&pathrev= 114631
by help of Ubuntu
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/137686


Cheers
Geert Stappers



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Old 12-13-2008, 11:05 AM
Moritz Muehlenhoff
 
Default Bug#508599: linux-image-2.6.26-1-686: Increase power_up delay to fix TI readers

On Fri, Dec 12, 2008 at 11:35:06PM +0100, Geert Stappers wrote:
> Package: linux-image-2.6.26-1-686
> Version: 2.6.26-11
> Severity: normal
> Tags: patch
>
> Hello Kernel maintainers,
>
> To get a SD cardreader working I needed to do
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 01ced4c..11f050c 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -492,7 +492,7 @@ static void mmc_power_up(struct mmc_host *host)
> * This delay must be at least 74 clock sizes, or 1 ms, or the
> * time required to reach a stable voltage.
> */
> - mmc_delay(2);
> + mmc_delay(10);
> }
>
> static void mmc_power_off(struct mmc_host *host)

Please send this patch to the kernel subsystem maintainer
(Pierre Ossman <drzeus-mmc@drzeus.cx>) for review/merge.

Cheers,
Moritz



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