mmc: sdhci-pci-o2micro: Fix SDR50 mode timing issue

Change SDR50 mode clock source from DLL output clock to PLL open clock
1.HS200 and SDR104 mode select DLL output clock
2.SDR50 mode select PLL open clock
Signed-off-by: Fred <fred.ai@bayhubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230223120450.16858-1-fredaibayhubtech@126.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-pci-o2micro.c

@@ -339,22 +339,24 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	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 */
-	pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &reg_val);
-	reg_val &= ~(O2_SD_SEL_DLL | O2_SD_PHASE_MASK);
-	reg_val |= (O2_SD_SEL_DLL | O2_SD_FIX_PHASE);
-	pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, reg_val);
+	if ((host->timing == MMC_TIMING_MMC_HS200) ||
+		(host->timing == MMC_TIMING_UHS_SDR104)) {
+		/* 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);
 
-	/* Lock WP */
-	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
-	scratch_8 |= 0x80;
-	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 */
+		pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &reg_val);
+		reg_val &= ~(O2_SD_SEL_DLL | O2_SD_PHASE_MASK);
+		reg_val |= (O2_SD_SEL_DLL | O2_SD_FIX_PHASE);
+		pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, reg_val);
 
+		/* Lock WP */
+		pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
+		scratch_8 |= 0x80;
+		pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
+	}
 	/* Start clk */
 	reg_val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
 	reg_val |= SDHCI_CLOCK_CARD_EN;