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mmc: mmci: Support for DDR mode

Message ID 1355324348-11481-1-git-send-email-ulf.hansson@stericsson.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ulf Hansson Dec. 12, 2012, 2:59 p.m. UTC 
From: Ulf Hansson <ulf.hansson@linaro.org>

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>
---
 drivers/mmc/host/mmci.c |    6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index aa04b42..4e4f5f1 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -202,6 +202,9 @@  static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
 	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 @@  static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 			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