[PATCH V1 1/2] mmc:sdhci-pci-o2micro: Change implementation of tuning for SDR104 and HS200 mode

[fred <fred.ai@bayhubtech.com>]

Select DLL clock of output tuning
Select fixed output tuning phase 0x9

Signed-off-by: fred<fred.ai@bayhubtech.com>

---
Change in V1:
1. Set register 0x354 bit 16 to select DLL clock
2. Set register 0x354 bit [23:20] to select fiexd output tuning phase 0x9
---
 drivers/mmc/host/sdhci-pci-o2micro.c | 51 +++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index f045c1ee4667..dfd447c1c367 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -43,6 +43,7 @@
 #define O2_SD_CAP_REG0		0x334
 #define O2_SD_UHS1_CAP_SETTING	0x33C
 #define O2_SD_DELAY_CTRL	0x350
+#define O2_SD_OUTPUT_CLK_SOURCE_SWITCH	0x354
 #define O2_SD_UHS2_L1_CTRL	0x35C
 #define O2_SD_FUNC_REG3		0x3E0
 #define O2_SD_FUNC_REG4		0x3E4
@@ -304,6 +305,11 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	int current_bus_width = 0;
 	u32 scratch32 = 0;
 	u16 scratch = 0;
+	u8  scratch_8 = 0;
+	u32 reg_val;
+	u8  dll_mode;
+	struct sdhci_pci_slot *slot = sdhci_priv(host);
+	struct sdhci_pci_chip *chip = slot->chip;
 
 	/*
 	 * This handler only implements the eMMC tuning that is specific to
@@ -322,6 +328,28 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	scratch |= O2_SD_PWR_FORCE_L0;
 	sdhci_writew(host, scratch, O2_SD_MISC_CTRL);
 
+	/*stop clk*/
+	reg_val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	reg_val &= ~(SDHCI_CLOCK_CARD_EN);
+	sdhci_writew(host, reg_val, SDHCI_CLOCK_CONTROL);
+
+	/*UnLock WP*/
+	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
+	scratch_8 &= 0x7f;
+	pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
+
+	//Set pcr 0x354[16] to choose dll clock ,and set the default phase
+	dll_mode = 0x9; //set default phase 9
+	pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &reg_val);
+	reg_val &= 0xFF0EFFFF;
+	reg_val |= ((1 << 16) | (dll_mode << 20));
+	pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, reg_val);
+
+    /*open clk*/
+	reg_val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	reg_val |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, reg_val, SDHCI_CLOCK_CONTROL);
+
 	/* wait DLL lock, timeout value 5ms */
 	if (readx_poll_timeout(sdhci_o2_pll_dll_wdt_control, host,
 		scratch32, (scratch32 & O2_DLL_LOCK_STATUS), 1, 5000))
@@ -532,24 +560,29 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
 
 	if (clock == 0)
 		return;
+	/*UnLock WP*/
+	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
+	scratch &= 0x7f;
+	pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
 
 	if ((host->timing == MMC_TIMING_UHS_SDR104) && (clock == 200000000)) {
-		pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
-
-		scratch &= 0x7f;
-		pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
-
 		pci_read_config_dword(chip->pdev, O2_SD_PLL_SETTING, &scratch_32);
 
 		if ((scratch_32 & 0xFFFF0000) != 0x2c280000)
 			o2_pci_set_baseclk(chip, 0x2c280000);
 
-		pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
-
-		scratch |= 0x80;
-		pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
+		/*If not SDR104 card mode, set 0x354 value 0*/
+		pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &scratch_32);
+		scratch_32 &= ~(1 << 16);
+		scratch_32 &= ~(0xf << 20);
+		pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH,scratch_32);
 	}
 
+    /*Lock WP*/
+	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
+	scratch |= 0x80;
+	pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
+
 	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
 	sdhci_o2_enable_clk(host, clk);
 }
-- 
2.32.0