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mmc: debugfs: expose the SDCLK frq in sys ios

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This patch is to expose the actual SDCLK frequency in
/sys/kernel/debug/mmcX/ios entry.

For example, if the max clk for a normal speed card is 20MHz this
is reported in /sys/kernel/debug/mmcX/ios.  Unfortunately the actual
SDCLK frequency (i.e. Baseclock / divisor) is not reported at all:
for example, in that case, on Arasan HC, it should be 48/4=12 (MHz).

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Giuseppe CAVALLARO 2011-11-04 13:53:19 +01:00 • committed by Chris Ball
parent 052d81da6e
commit df16219f36
3 changed files with 14 additions and 0 deletions
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2
include/linux/mmc/host.h
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@ -323,6 +323,8 @@ struct mmc_host {
struct fault_attr fail_mmc_request;
#endif
unsigned int actual_clock; /* Actual HC clock rate */
unsigned long private[0] ____cacheline_aligned;
};