Hardware: SAMA5D27 customized board, EMMC connected to SDMMC0. SDMMC0_CD pin pulled-down for BootROM card detection, once booted it used as LED output.
Software: u-boot-at91 76f7f55
Issue: U-Boot can't detect EMMC despite it set to non-removable in DT, unless SDMMC0_CD pin is used (so this pin can't be used for other purpose)
sdmmc0: sdio-host@a0000000 { bus-width = <4>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_sdmmc0_default>; status = "okay"; non-removable; no-1-8-v; };
Workaround: I have to FCD bit of SDMMC_MC1R register.
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 766e4a6b0c..89ceeaf3c1 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -758,7 +758,12 @@ static int sdhci_get_cd(struct udevice *dev)
/* If nonremovable, assume that the card is always present. */ if (mmc->cfg->host_caps & MMC_CAP_NONREMOVABLE) + { + value = sdhci_readb(host, SDHCI_HOST_MC1R); + sdhci_writeb(host, SDHCI_VENDOR_MC1R_FCD | value, SDHCI_HOST_MC1R); return 1; + } + /* If polling, assume that the card is always present. */ if (mmc->cfg->host_caps & MMC_CAP_NEEDS_POLL) return 1; diff --git a/include/sdhci.h b/include/sdhci.h index c718dd7206..61e7ebb2a1 100644 --- a/include/sdhci.h +++ b/include/sdhci.h @@ -223,6 +223,9 @@
#define SDHCI_GET_VERSION(x) (x->version & SDHCI_SPEC_VER_MASK)
+#define SDHCI_HOST_MC1R 0x204 + +#define SDHCI_VENDOR_MC1R_FCD 0x80 /* * End of controller registers. */