From: Trac Hoang trac.hoang@broadcom.com
The iproc host eMMC/SD controller hold time does not meet the specification in the HS50 mode. This problem can be mitigated by disabling the HISPD bit; thus forcing the controller output data to be driven on the falling clock edges rather than the rising clock edges.
Stable tag (v4.12+) chosen to assist stable kernel maintainers so that the change does not produce merge conflicts backporting to older kernel versions. In reality, the timing bug existed since the driver was first introduced but there is no need for this driver to be supported in kernel versions that old.
Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: Trac Hoang trac.hoang@broadcom.com Signed-off-by: Scott Branden scott.branden@broadcom.com Acked-by: Adrian Hunter adrian.hunter@intel.com --- drivers/mmc/host/sdhci-iproc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c index 9d4071c41c94..2feb4ef32035 100644 --- a/drivers/mmc/host/sdhci-iproc.c +++ b/drivers/mmc/host/sdhci-iproc.c @@ -220,7 +220,8 @@ static const struct sdhci_iproc_data iproc_cygnus_data = {
static const struct sdhci_pltfm_data sdhci_iproc_pltfm_data = { .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | - SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, + SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 | + SDHCI_QUIRK_NO_HISPD_BIT, .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN, .ops = &sdhci_iproc_ops, };