Hey Tom and Udit,
On 10/03/26 04:45, Tom Rini wrote:
On Fri, Feb 20, 2026 at 03:17:37PM +0530, Moteen Shah wrote:
On 20/02/26 14:05, Kumar, Udit wrote:
On 2/20/2026 12:55 PM, Moteen Shah wrote:
Add config to allow UHS support, in turn allowing to select
UHS speed modes for the SD card
Signed-off-by: Moteen Shah <[email protected]>
---
Test logs:
https://gist.github.com/Jamm02/e8b8b8c95cb62a7145d73f7ef50b2d8e
configs/j722s_evm_a53_defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/configs/j722s_evm_a53_defconfig
b/configs/j722s_evm_a53_defconfig
index e84670c75ed..24ee293c803 100644
--- a/configs/j722s_evm_a53_defconfig
+++ b/configs/j722s_evm_a53_defconfig
@@ -107,6 +107,7 @@ CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_ADMA=y
CONFIG_SPL_MMC_SDHCI_ADMA=y
CONFIG_MMC_SDHCI_AM654=y
+CONFIG_MMC_UHS_SUPPORT=y
you may need at A72/SPL stage as well,
Other J7 boards already have this config enabled in the a72 stage.
and do you think , R5/SPL will need this too ?
Any of the K3 devices does not enables this in R5 SPL, though we do have
HS400 enabled in the R5 stage.
Adding the config should result in a little performance gain I think.
Is this a function of board design, or a SoC-level feature?
SOC level feature, thought it has dependency on the board to provide the
right voltage to the card.
@udit, I did some profiling with UHS enabled at the R5 stage on
J784s4-EVM but I see no performance gain there, likely due to the fact
that the R5 stage takes up very minimal percentage of the boot time.
This patch can go in as it is.
Regards,
Moteen
