[PATCH 11/40] mmc: sdhci: Add a quirk to skip clearing the transfer mode register on tuning
From: Aapo Vienamo <hidden>
Date: 2018-08-01 16:33:19
Also in:
linux-mmc, linux-tegra, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
Add SDHCI_QUIRK2_TUNE_SKIP_XFERRMODE_REG_PROG to skip programming the SDHCI_TRANSFER_MODE in sdhci_set_transfer_mode() if tuning command is being sent. On Tegra210 and Tegra186 the tuning sequence hangs if the SDHCI transfer mode register is touched. Signed-off-by: Aapo Vienamo <redacted> --- drivers/mmc/host/sdhci.c | 6 ++++++ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 8 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a7b5602..04dc443 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -1028,6 +1028,12 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, if (data == NULL) { if (host->quirks2 & + SDHCI_QUIRK2_TUNE_SKIP_XFERMODE_REG_PROG && + (cmd->opcode == MMC_SEND_TUNING_BLOCK || + cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)) { + return; + } + if (host->quirks2 & SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) { sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE); } else {
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 23966f8..0a99008 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h@@ -450,6 +450,8 @@ struct sdhci_host { * obtainable timeout. */ #define SDHCI_QUIRK2_DISABLE_HW_TIMEOUT (1<<17) +/* Don't clear the SDHCI_TRANSFER_MODE register on tuning commands */ +#define SDHCI_QUIRK2_TUNE_SKIP_XFERMODE_REG_PROG (1<<18) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */
--
2.7.4