On 29/07/22 13:05, Chevron Li wrote:
> 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@xxxxxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> Changes on V1:
> 1.Set quirks2 flag SDHCI_QUIRK2_BROKEN_DDR50 for bayhub chips.
> 2.Use bayhub hardware input tuning for SDR50 mode instead of standard tuning flow.
>
> Changes on V2:
> Update commit format and information.
> ---
> drivers/mmc/host/sdhci-pci-o2micro.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index 0d4d343dbb77..ad457cd9cbaa 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/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) {
>
> base-commit: 68e77ffbfd06ae3ef8f2abf1c3b971383c866983
