linux-kernel - Re: [PATCH 2.6.19] mmc: Fix handling of response types in imxmmc and tifm drivers

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Date:	Sun, 7 Jan 2007 18:34:22 +0100
From:	Pavel Pisa <ppisa@...ron.com>
To:	Philip Langdale <philipl@...rt.org>
Cc:	linux-kernel@...r.kernel.org,
	Pierre Ossman <drzeus-list@...eus.cx>,
	Alex Dubov <oakad@...oo.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH 2.6.19] mmc: Fix handling of response types in imxmmc and tifm drivers

Hello Philip,

On Thursday 04 January 2007 16:04, Philip Langdale wrote:
> This change depends on my SDHC patch and fixes a bug that was revealed
> during the development of that patch. The R6 response type should be
> identical to R1 (and R7) but was incorrectly defined differently. Fixing
> the R6 definition breaks assumptions in these two drivers that response
> type flags are unique. Pierre and Alex both believe that treating R6 and R7
> as R1 will be sufficient. ie: The controllers do not care about the
> differences between them. Due to lack of hardware, I have done no testing.

I have tested your patch.
Kernel builds. I have not found much time for testing.
But I would not like to block changes and I am going
for next week to project meeting in Spain, so there is
my reply.

I have 2.6.19 + realtime-patches rt14 on the hand.
I have been able to mount and use some cards, but it
I have observed some problems probably related to timing
when I have tried to change CPU frequency.

I need to find time to do more checking on vanilla and RT kernels
when I return. I have some ideas what could be enhanced to ensure
better MX1 SDHC cards recognition under RT kernels. I am not sure,
what causes other seen problems, but I have observed these things
on RT even without your patch.

Conclusion: I knowledge your patch and admit, that I need to
find time for my homeworks.

Best wishes

               Pavel Pisa

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