This patch is added the use_hold_reg bit in CMD register.
In upper version than 2.40a, bit[29] of CMD register is used the use_hold_reg.
Some SoC is affected by this bit.
(This bit means whether use hold register when send data and cmd.
And related with cclk_in_drv phase)
Now i known that HOLD-register is using only Exynos-SoC.
But hold-register is supported basically feature at Synopsys-IP.
If Other SoC is used hold regster, we can change the _CLKSEL_REG_.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 36 ++++++++++++++++++++++++++++++++++++
drivers/mmc/host/dw_mmc.h | 1 +
include/linux/mmc/dw_mmc.h | 3 +++
3 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 437fdf8..3642455 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -265,11 +265,45 @@ static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
static void dw_mci_start_command(struct dw_mci *host,
struct mmc_command *cmd, u32 cmd_flags)
{
+ struct dw_mci_slot *slot = host->cur_slot;
+ struct mmc_ios *ios = &slot->mmc->ios;
+
host->cmd = cmd;
dev_vdbg(&host->dev,
"start command: ARGR=0x%08x CMDR=0x%08x\n",
cmd->arg, cmd_flags);
+ if (host->quirks & DW_MCI_QUIRK_USE_CLKSEL_REG) {
+ /*
+ * If use HOLD register and SDR12/SDSR25,
+ * CMD and DATA sent to card through HOLD regster by default.
+ * But if mode is SDR50/DDR50/SDR104,
+ * only use the hold register when cclk_in_drv value is greater than 0.
+ */
+ switch (ios->timing) {
+ case MMC_TIMING_UHS_SDR50:
+ case MMC_TIMING_UHS_DDR50:
+ case MMC_TIMING_UHS_SDR104:
+ if (host->pdata->get_clk_drv &&
+ host->pdata->get_clk_drv(host) &&
+ host->use_hold_reg) {
+ cmd_flags |= SDMMC_CMD_USE_HOLD_REG;
+ break;
+ }
+
+ cmd_flags &= ~SDMMC_CMD_USE_HOLD_REG;
+ break;
+ case MMC_TIMING_UHS_SDR12:
+ case MMC_TIMING_UHS_SDR25:
+ if (host->use_hold_reg) {
+ cmd_flags |= SDMMC_CMD_USE_HOLD_REG;
+ break;
+ }
+ default:
+ cmd_flags &= ~SDMMC_CMD_USE_HOLD_REG;
+ }
+ }
+
mci_writel(host, CMDARG, cmd->arg);
wmb();
@@ -2015,6 +2049,8 @@ int dw_mci_probe(struct dw_mci *host)
host->data_shift = 2;
}
+ host->use_hold_reg = (mci_readl(host, HCON) >> 22) & 0x1;
+
/* Reset all blocks */
if (!mci_wait_reset(&host->dev, host))
return -ENODEV;
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index b6a1a78..cc905ee 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -111,6 +111,7 @@
#define SDMMC_INT_ERROR 0xbfc2
/* Command register defines */
#define SDMMC_CMD_START BIT(31)
+#define SDMMC_CMD_USE_HOLD_REG BIT(29)
#define SDMMC_CMD_CCS_EXP BIT(23)
#define SDMMC_CMD_CEATA_RD BIT(22)
#define SDMMC_CMD_UPD_CLK BIT(21)
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index f20979c..803a80d 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -156,6 +156,7 @@ struct dw_mci {
u32 fifoth_val;
u16 verid;
u16 data_offset;
+ bool use_hold_reg;
struct device dev;
struct dw_mci_board *pdata;
struct dw_mci_slot *slot[MAX_MCI_SLOTS];
@@ -201,6 +202,8 @@ struct dw_mci_dma_ops {
#define DW_MCI_QUIRK_HIGHSPEED BIT(2)
/* Unreliable card detection */
#define DW_MCI_QUIRK_BROKEN_CARD_DETECTION BIT(3)
+/* To use the CLKSEL register for phase-shift */
+#define DW_MCI_QUIRK_USE_CLKSEL_REG BIT(4)
struct dma_pdata;
--
1.7.4.1
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