On Fri, 11 Jan 2008 14:17:01 +0800
"Bryan Wu" <[EMAIL PROTECTED]> wrote:
> We were told this is an hardware design issue, so please help us to
> workaround it in software side with Mike's patch.
I'm afraid that's insufficient motivation for this change. All documentation
and real world tests say that MMC and SD 4-bit data is 100% compatible. So it's
far more probable that you've misdiagnosed your error than this being the
actual problem. The fact that 4-bit MMC support has been present for some time
and you're only now seeing a problem further supports that.
In light of that, the suggested patch would not only be incorrect, it would
also be worse than doing nothing. You would be papering over a symptom, making
the real problem harder to find.
If you want something ready for upstream, for now I suggest removing
MMC_CAP_4_BIT_DATA completely from your driver's caps field.
Rgds
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org
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