On Sunday 26 February 2023 01:45:16 Martin Rowe wrote:
On Sat, 25 Feb 2023 at 22:14, Pali Rohár pali@kernel.org wrote:
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 just tried this and the device is not detected again; adding "non-removable" seems to be required if changing the dts.
I do not know if there is a better option for ignoring card-detect pin in u-boot, so:
I should point out that I did investigate runtime detection.
But how you want to do that runtime detection? As I pointed above I think it is impossible do runtime detection because it is chicken and egg problem.
You can patch fdt only after u-boot initialize mmc, so this can be used just for patching kernel fdt.
Patching the fdt alone didn't seem to work using the hooks that were available, so I started looking into how MMC was being initialised to figure out if there was something changing the state of the device before it was returned to BootROM. I ended up in drivers/mmc/mmc.c mmc_start_init trying to figure out how we always end up with the "MMC: no card present" message in the eMMC case. I was going to write some extra logic around the mmc_getcd call, but realised there was already an ifndef with a config that seemed like this exact use-case. Given that config solved the problem it seemed like the cleanest solution.
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