[PATCH v3 5/7] mmc: bcmstb: Add support for bcm2712 SD controller

[Florian Fainelli]

On 12/18/2023 10:03 PM, Ivan T. Ivanov wrote:
> Borrow SD quirks from vendor Linux driver.
> 
> "BCM2712 unfortunately carries with it a perennial bug with the SD
> controller register interface present on previous chips (2711/2709/2708).
> Accesses must be dword-sized and a read-modify-write cycle to the 32-bit
> registers containing the COMMAND, TRANSFER_MODE, BLOCK_SIZE and
> BLOCK_COUNT registers tramples the upper/lower 16 bits of data written.
> BCM2712 does not seem to need the extreme delay between each write as on
> previous chips, just the serialisation of writes to these registers in a
> single 32-bit operation."
> 
> Signed-off-by: Ivan T. Ivanov <iivanov at suse.de>

This is diverging from the Linux sdhci-brcmstb.c driver where no such 
quirk needs to be carried out, rather the logic for such quirks has been 
present in sdhci-iproc.c...
-- 
Florian
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4221 bytes
Desc: S/MIME Cryptographic Signature
URL: <https://lists.denx.de/pipermail/u-boot/attachments/20231221/607c9727/attachment.bin>