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mmc: Fix bug in sd_set_card_speed()

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After settings the speed of the sd with the switch command, a check is
done to make sure that the new speed has been set. The current check has a
masking error: speed are encoded on 4 bits only.
Fix it by masking the upper bits.

This fixes a problem seen with QEmu emulating a vexpress-a15.

Reported-by: Jonathan Gray <jsg@jsg.id.au>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Tested-by: Jonathan Gray <jsg@jsg.id.au>
This commit is contained in:
Jean-Jacques Hiblot 2018-02-09 12:09:27 +01:00 committed by Jaehoon Chung
parent 127a6011ee
commit a0276f3eee
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/mmc.c
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@ -1333,7 +1333,7 @@ static int sd_set_card_speed(struct mmc *mmc, enum bus_mode mode)
if (err)
return err;
if ((__be32_to_cpu(switch_status[4]) >> 24) != speed)
if (((__be32_to_cpu(switch_status[4]) >> 24) & 0xF) != speed)
return -ENOTSUPP;
return 0;