https://github.com/torvalds/linux
Revision a9e58f25734e153b8c6516d904e2398fb8b0b23d authored by Anton Vorontsov on 29 July 2009, 22:04:16 UTC, committed by Linus Torvalds on 30 July 2009, 02:10:36 UTC
Since commit 8dfd0374be84793360db7fff2e635d2cd3bbcb21 ("MMC core: limit
minimum initialization frequency to 400kHz") MMC core checks for minimum
frequency, and that causes following messages flood when using eSDHC
controllers:
...
mmc0: Minimum clock frequency too high for identification mode
mmc0: Minimum clock frequency too high for identification mode
...
The warnings are legitimate, since if we'd use 133 MHz clocks for standard
SDHCI controllers, we'd not able to scale frequency down to 400 kHz.
But eSDHC controllers have a non-standard SD clock management, so we can
divide clock by 256 * 16, not just 256.
This patch introduces get_min_clock() callback for sdhci core and
implements it for sdhci-of driver, and thus fixes the issue.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent cab8bd3
Tip revision: a9e58f25734e153b8c6516d904e2398fb8b0b23d authored by Anton Vorontsov on 29 July 2009, 22:04:16 UTC
sdhci: get rid of "frequency too high" flood when using eSDHC
sdhci: get rid of "frequency too high" flood when using eSDHC
Tip revision: a9e58f2
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .gitignore | -rw-r--r-- | 952 bytes |
| .mailmap | -rw-r--r-- | 3.9 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 91.7 KB |
| Kbuild | -rw-r--r-- | 2.4 KB |
| MAINTAINERS | -rw-r--r-- | 149.3 KB |
| Makefile | -rw-r--r-- | 53.9 KB |
| README | -rw-r--r-- | 17.0 KB |
| REPORTING-BUGS | -rw-r--r-- | 3.1 KB |
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