Re: [PATCH 1/2] arm: mvebu: clearfog: Fix MMC detection

Pali Rohár
2023-02-25T22:14:44Z

On Saturday 25 February 2023 22:49:56 Pali Rohár wrote:
> On Saturday 25 February 2023 11:42:19 Martin Rowe wrote:
> > A388 Clearfog MMC is either SD Card or eMMC with different behaviour for
> > both. Setting MMC_BROKEN_CD allows both to correctly detect MMC.
> >
> > Signed-off-by: Martin Rowe <martin.p.rowe@gmail.com>
>
> It looks like a hack but I think we do not have a better option for now.
>
> If I understand the issue correctly then card-detect pin is unconnected
> for eMMC variant and used for checking if SD card is present for SD
> variant. Unconnected pin seems to have some internal pull-up/down which
> reports not-present state for eMMC variant. eMMC does not have any
> presence signal, so card-detect pin must be ignored for eMMC.
>
> This looks like a chicken and egg problem and the only option to support
> both variants is to ignore card-detect pin and always try to initialize
> device connected to mmc controller (which may be eMMC or SD).

Hm... maybe better way could be to edit armada-388-clearfog-u-boot.dtsi
file and add there this? /delete-property/ cd-gpios;

> I do not know if there is a better option for ignoring card-detect pin
> in u-boot, so:
>
> Acked-by: Pali Rohár <pali@kernel.org>
>
> > ---
> > configs/clearfog_defconfig | 3 +--
> > configs/clearfog_sata_defconfig | 8 ++++----
> > 2 files changed, 5 insertions(+), 6 deletions(-)
> >
> > diff --git a/configs/clearfog_defconfig b/configs/clearfog_defconfig
> > index 8cd35f9f1a..24e7c16ac7 100644
> > --- a/configs/clearfog_defconfig
> > +++ b/configs/clearfog_defconfig
> > @@ -46,7 +46,6 @@ CONFIG_CMD_USB=y
> > CONFIG_CMD_TFTPPUT=y
> > CONFIG_CMD_CACHE=y
> > CONFIG_CMD_TIME=y
> > -CONFIG_CMD_MVEBU_BUBT=y
> > CONFIG_ENV_OVERWRITE=y
> > CONFIG_ENV_MIN_ENTRIES=128
> > CONFIG_ARP_TIMEOUT=200
> > @@ -59,7 +58,7 @@ CONFIG_DM_I2C=y
> > CONFIG_SYS_I2C_MVTWSI=y
> > CONFIG_I2C_EEPROM=y
> > CONFIG_SPL_I2C_EEPROM=y
> > -CONFIG_SUPPORT_EMMC_BOOT=y
> > +CONFIG_MMC_BROKEN_CD=y
> > CONFIG_MMC_SDHCI=y
> > CONFIG_MMC_SDHCI_SDMA=y
> > CONFIG_MMC_SDHCI_MV=y
> > diff --git a/configs/clearfog_sata_defconfig b/configs/clearfog_sata_defconfig
> > index e9b36150ea..84f900bf50 100644
> > --- a/configs/clearfog_sata_defconfig
> > +++ b/configs/clearfog_sata_defconfig
> > @@ -6,11 +6,14 @@ CONFIG_TEXT_BASE=0x00800000
> > CONFIG_SPL_LIBCOMMON_SUPPORT=y
> > CONFIG_SPL_LIBGENERIC_SUPPORT=y
> > CONFIG_NR_DRAM_BANKS=2
> > +CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
> > +CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xff0000
> > CONFIG_TARGET_CLEARFOG=y
> > CONFIG_MVEBU_SPL_BOOT_DEVICE_SATA=y
> > CONFIG_DEFAULT_DEVICE_TREE="armada-388-clearfog"
> > CONFIG_SPL_TEXT_BASE=0x40000030
> > CONFIG_SPL_SERIAL=y
> > +CONFIG_SPL_STACK=0x4002c000
> > CONFIG_SPL=y
> > CONFIG_DEBUG_UART_BASE=0xf1012000
> > CONFIG_DEBUG_UART_CLOCK=250000000
> > @@ -18,8 +21,6 @@ CONFIG_SYS_LOAD_ADDR=0x800000
> > CONFIG_DEBUG_UART=y
> > CONFIG_AHCI=y
> > CONFIG_DISTRO_DEFAULTS=y
> > -CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
> > -CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xff0000
> > CONFIG_BOOTDELAY=3
> > CONFIG_USE_PREBOOT=y
> > CONFIG_SYS_CONSOLE_INFO_QUIET=y
> > @@ -31,7 +32,6 @@ CONFIG_SPL_BSS_START_ADDR=0x40023000
> > CONFIG_SPL_BSS_MAX_SIZE=0x4000
> > CONFIG_SPL_SYS_MALLOC_SIMPLE=y
> > # CONFIG_SPL_SHARES_INIT_SP_ADDR is not set
> > -CONFIG_SPL_STACK=0x4002c000
> > CONFIG_SPL_I2C=y
> > CONFIG_SYS_MAXARGS=32
> > CONFIG_CMD_TLV_EEPROM=y
> > @@ -46,7 +46,6 @@ CONFIG_CMD_USB=y
> > CONFIG_CMD_TFTPPUT=y
> > CONFIG_CMD_CACHE=y
> > CONFIG_CMD_TIME=y
> > -CONFIG_CMD_MVEBU_BUBT=y
> > CONFIG_ENV_OVERWRITE=y
> > CONFIG_ENV_MIN_ENTRIES=128
> > CONFIG_ARP_TIMEOUT=200
> > @@ -59,6 +58,7 @@ CONFIG_DM_I2C=y
> > CONFIG_SYS_I2C_MVTWSI=y
> > CONFIG_I2C_EEPROM=y
> > CONFIG_SPL_I2C_EEPROM=y
> > +CONFIG_MMC_BROKEN_CD=y
> > CONFIG_SUPPORT_EMMC_BOOT=y
> > CONFIG_MMC_SDHCI=y
> > CONFIG_MMC_SDHCI_SDMA=y
> > --
> > 2.39.2
> >