mmc: Make ID freq configurable

In the latest releases of the mmc driver, the freq during initialization
is set to a fixed 400 Khz.  This was reportedly too fast for several
users.  As there doesn't seem to be an ideal frequency
which-works-for-all, Pierre suggested to let the driver try several
frequencies.

This patch implements that idea. It will try mmc-initialization using
several frequencies from an array 400, 300, 200 and 100.

In case SDIO is broken, it'll still try to detect SDMEM, also at different
freqs.

Signed-off-by: Hein Tibosch <[email protected]>
Cc: Pierre Ossman <[email protected]>
Reviewed-by: Chris Ball <[email protected]>
Tested-by: Chris Ball <[email protected]>
Cc: Ben Nizette <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Chris Ball <[email protected]>

0 files changed, 0 insertions, 0 deletions