ARM: 7617/1: mmc: mmci: Support for DDR mode
Add support for DDR mode which may be used for the ux500v2 variant.
Corresponding capabilities to enable the DDR support must be set in
the platform struct to enable the functionality.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 1507723..fba5107 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -202,6 +202,9 @@
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
clk |= MCI_ST_8BIT_BUS;
+ if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
+ clk |= MCI_ST_UX500_NEG_EDGE;
+
mmci_write_clkreg(host, clk);
}
@@ -680,6 +683,9 @@
mmci_write_clkreg(host, clk);
}
+ if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
+ datactrl |= MCI_ST_DPSM_DDRMODE;
+
/*
* Attempt to use DMA operation mode, if this
* should fail, fall back to PIO mode