Using the MXS MCI driver with an eight bit capable eMMC results into the
'devinfo' message the interface uses '0' bits for data transfer:
barebox:/ devinfo mxs_mci0
resources:
num : 0
start : 0x80034000
size : 0x00002000
driver: mxs_mci
bus: platform
Interface
Min. bus clock: 1476 Hz
Max. bus clock: 48000000 Hz
Current bus clock: 24000000 Hz
Bus width: 0 bit
The eight bit interface width is stored internally as value '2'. And a two bit
'2' ends up into 0xfffffffe when used as an array index. Using an unsigned
field instead fixes this issue:
barebox:/ devinfo mxs_mci0
resources:
num : 0
start : 0x80034000
size : 0x00002000
driver: mxs_mci
bus: platform
Interface
Min. bus clock: 1476 Hz
Max. bus clock: 48000000 Hz
Current bus clock: 24000000 Hz
Bus width: 8 bit
Signed-off-by: Juergen Beisert <j...@pengutronix.de>
diff --git a/drivers/mci/mxs.c b/drivers/mci/mxs.c
index c15461c..9dee863 100644
--- a/drivers/mci/mxs.c
+++ b/drivers/mci/mxs.c
@@ -55,7 +55,7 @@ struct mxs_mci_host {
unsigned f_min;
unsigned f_max;
#endif
- int bus_width:2; /* 0 = 1 bit, 1 = 4 bit, 2 = 8 bit */
+ unsigned bus_width:2; /* 0 = 1 bit, 1 = 4 bit, 2 = 8 bit */
};
#define to_mxs_mci(mxs) container_of(mxs, struct mxs_mci_host, host)
--
Pengutronix e.K. | Juergen Beisert |
Linux Solutions for Science and Industry | http://www.pengutronix.de/ |
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