sdhci max_blk_size

Hi,

our controller set "Max Block Length" to 3 (4096 byte), but the linux driver ignore this value [1].

Is there any reason to do that .
Or it is code that was written with an older sdhci spec, and we can ignore this check today.

Matthieu

PS : please keep me in CC.

[1]

if (mmc->max_blk_size >= 3) {
            pr_warning("%s: Invalid maximum block size, "
                "assuming 512 bytes\n", mmc_hostname(mmc));
            mmc->max_blk_size = 0;
        }

The reason is, sd host controller spec defines 3 as reserved, not 4096.

The current sdhci driver follows v3 spec, is the v4 spec out that defined this bit?

ok, in fact this is an extension of our controller : it claims to be sdhci v2, but they added extra registers and added some field in standard register.

For example they added 4K support by using bit 15 of Block size register.

I think we should use SDHCI_QUIRK_FORCE_BLK_SZ_2048.

Sorry for the mail.

Matthieu