mmc: sdhci-pci-o2micro: fix some SD cards compatibility issue at DDR50 mode

Bayhub chips have better compatibility support for SDR50 than DDR50
and both mode have the same R/W performance when clock frequency >= 100MHz.
Disable DDR50 mode and use SDR50 instead.
Signed-off-by: Chevron Li <chevron.li@bayhubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20220729100524.387-1-chevron.li@bayhubtech.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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

@@ -317,11 +317,12 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	u32 reg_val;
 
 	/*
-	 * This handler only implements the eMMC tuning that is specific to
+	 * This handler implements the hardware tuning that is specific to
 	 * this controller.  Fall back to the standard method for other TIMING.
 	 */
 	if ((host->timing != MMC_TIMING_MMC_HS200) &&
-		(host->timing != MMC_TIMING_UHS_SDR104))
+		(host->timing != MMC_TIMING_UHS_SDR104) &&
+		(host->timing != MMC_TIMING_UHS_SDR50))
 		return sdhci_execute_tuning(mmc, opcode);
 
 	if (WARN_ON((opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
@@ -631,6 +632,8 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
 		if (reg & 0x1)
 			host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 
+		host->quirks2 |= SDHCI_QUIRK2_BROKEN_DDR50;
+
 		sdhci_pci_o2_enable_msi(chip, host);
 
 		if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {