[PATCH] mmc: mmci: Support for DDR mode
From: Ulf Hansson <hidden>
Date: 2012-12-12 14:59:08
Also in:
linux-mmc
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Russell King, Ulf Hansson, Linus Torvalds
From: Ulf Hansson <redacted> 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 <redacted> --- drivers/mmc/host/mmci.c | 6 ++++++ 1 file changed, 6 insertions(+)
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
--
1.7.10