[PATCH] riscv: dts: starfive: fml13v01: increase eMMC bus speed

[Maud Spierings]

On 2/19/25 3:21 PM, Emil Renner Berthing wrote:
> Maud Spierings via B4 Relay wrote:
>> From: Maud Spierings <maud_spierings at hotmail.com>
>>
>> The assigned clock speed of 50 MHz is and max-frequency of 100MHz are
>> limitting this interface which is SDIO 5.0 capable. Sadly at 200MHz it
>> fails to mount an eMMC drive, 150MHz (really 132 MHz) is the highest it
>> was able to get.
>>
>> This improves the seq read/write performance by 2x~
>>
>> Signed-off-by: Maud Spierings <maud_spierings at hotmail.com>
>> ---
>> I put this in this specific dts instead of the common one as I cannot
>> test if other boards are also able to handle these speeds.
> Hi Maud,
>
> Thanks for the patch!
>
> These settings work on my Milk-V Mars board booting off eMMC, but I'm not sure
> if that means we can just raise the frequency across all the JH7110 boards.
> The eMMC on my Milk-V mars is a detachable module that identifies as
>
>    mmcblk0: mmc0:0001 DG4016 14.7 GiB
>
> I guess what works might depend on the module too. Is the eMMC on the framework
> board soldered on?


No it is also a detachable module, it supports the same interface as 
most eMMC modules seem to.

> Raising the max-frequency to 200MHz seems right for all boards since we're
> already saying mmc0 supports HS200 mode.
>
> Maybe we could begin by raising the max frequency to 200MHz for all boards,
> but only assign the 150MHz rate on the framework board?

That seems alright with me, I'll send a v2 with max-frequency adjusted 
in jh7110-common instead.

> /Emil
kind regards,
Maud