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authorCorneliu Doban <corneliu.doban@broadcom.com>2018-05-18 15:03:56 -0700
committerUlf Hansson <ulf.hansson@linaro.org>2018-05-21 13:19:48 +0200
commit5f651b870485ee60f5abbbd85195a6852978894a (patch)
tree3f545a53cddd74a8f78f175c5ff81f4635607028 /virt/Makefile
parent4c94238f37af87a2165c3fb491b4a8b50e90649c (diff)
downloadlinux-5f651b870485ee60f5abbbd85195a6852978894a.tar.bz2
mmc: sdhci-iproc: fix 32bit writes for TRANSFER_MODE register
When the host controller accepts only 32bit writes, the value of the 16bit TRANSFER_MODE register, that has the same 32bit address as the 16bit COMMAND register, needs to be saved and it will be written in a 32bit write together with the command as this will trigger the host to send the command on the SD interface. When sending the tuning command, TRANSFER_MODE is written and then sdhci_set_transfer_mode reads it back to clear AUTO_CMD12 bit and write it again resulting in wrong value to be written because the initial write value was saved in a shadow and the read-back returned a wrong value, from the register. Fix sdhci_iproc_readw to return the saved value of TRANSFER_MODE when a saved value exist. Same fix for read of BLOCK_SIZE and BLOCK_COUNT registers, that are saved for a different reason, although a scenario that will cause the mentioned problem on this registers is not probable. Fixes: b580c52d58d9 ("mmc: sdhci-iproc: add IPROC SDHCI driver") Signed-off-by: Corneliu Doban <corneliu.doban@broadcom.com> Signed-off-by: Scott Branden <scott.branden@broadcom.com> Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'virt/Makefile')
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