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| author | Clifford Wolf <clifford@clifford.at> | 2007-07-17 13:04:06 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 19:23:04 +0200 |
| commit | 698ca47e8dba93f4b001b06b4c7037b09ac6eb09 (patch) | |
| tree | 2e1f817e847d37b7397171d7fe15dc5ee0a79d07 /drivers/spi/atmel_spi.c | |
| parent | spi_lm70llp parport adapter driver (diff) | |
| download | linux-698ca47e8dba93f4b001b06b4c7037b09ac6eb09.tar.xz linux-698ca47e8dba93f4b001b06b4c7037b09ac6eb09.zip | |
spi_mpc83xx.c underclocking hotfix
The MPC83xx SPI controller clock divider can divide the system clock by not
more then 1024. The spi_mpc83xx driver does not check this and silently
writes garbage to the SPI controller registers when asked to run at lower
frequencies. I've tried to run the SPI on a 266MHz MPC8349E with 100kHz
for debugging a bus problem and suddenly was confronted with a 2nd problem
to debug.. ;-)
The patch adds an additional check which avoids writing garbage to the SPI
controller registers and warn the user about it. This might help others to
avoid simmilar problems.
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi/atmel_spi.c')
0 files changed, 0 insertions, 0 deletions