linux-kernel - [PATCH V2 1/1] mmc: sdhci-pci-o2micro: fix some SD cards compatibility issue at DDR50 mode

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Date:   Fri, 29 Jul 2022 03:05:24 -0700
From:   Chevron Li <chevron.li@...hubtech.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shaper.liu@...hubtech.com, shirley.her@...hubtech.com,
        xiaoguang.yu@...hubtech.com
Subject: [PATCH V2 1/1] 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@...hubtech.com>
---
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
-- 
2.32.0