From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
This patch adds support to fbclk that is used to latch data and
cmd on some controllers like SD Card controller in Qcom SOC.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
drivers/mmc/host/mmci.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 05ae654..bc7b80d 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -54,6 +54,8 @@ static unsigned int fmax = 515633;
* @clkreg_enable: enable value for MMCICLOCK register
* @clkreg_8bit_bus_enable: enable value for 8 bit bus
* @clkreg_neg_edge_enable: enable value for inverted data/cmd output
+ * @clkreg_fbclk_latch: enable value to select feedback clock to
+ * latch data and command comming in.
* @datalength_bits: number of bits in the MMCIDATALENGTH register
* @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
* is asserted (likewise for RX)
@@ -79,6 +81,7 @@ struct variant_data {
unsigned int clkreg_enable;
unsigned int clkreg_8bit_bus_enable;
unsigned int clkreg_neg_edge_enable;
+ unsigned int clkreg_fbclk_latch;
unsigned int datalength_bits;
unsigned int fifosize;
unsigned int fifohalfsize;
@@ -189,6 +192,7 @@ static struct variant_data variant_qcom = {
.clkreg = MCI_CLK_ENABLE,
.clkreg_enable = MCI_QCOM_CLK_FLOWENA,
.clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
+ .clkreg_fbclk_latch = MCI_QCOM_CLK_FEEDBACK_CLK,
.datactrl_mask_ddrmode = MCI_QCOM_CLK_DDR_MODE,
.data_cmd_enable = MCI_QCOM_CSPM_DATCMD,
.blksz_datactrl4 = true,
@@ -343,6 +347,7 @@ static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
host->cclk = host->mclk / (2 * (clk + 1));
}
+ clk |= variant->clkreg_fbclk_latch;
clk |= variant->clkreg_enable;
clk |= MCI_CLK_ENABLE;
/* This hasn't proven to be worthwhile */
--
1.9.1
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