Hi Zixun Li,
On 4/27/23 22:51, Zixun Li wrote:
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;
+ }
+
Can you find some place to set this bit in the atmel sdhci driver, and
not in the core?
The MC1R register is specific to at91 device.
Eugen
/* 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.
*/
