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SD command queue compatibility expansion #7265

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SD command queue compatibility expansion #7265

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ec1ef20
mmc: sd: add fall-back extension register parsing attempt
P33M Mar 5, 2026
397d0e6
mmc: sd: add quirk for buggy CMD49 handling
P33M Mar 5, 2026
87a401c
mmc: sd: Transcend cards need a CMD49 quirk
P33M Mar 5, 2026
da91f3e
mmc: sd: Biwin cards need a CMD49 quirk
P33M Mar 5, 2026
a4dfd82
mmc: sd: HACK add module parameter to allow CQ write depth modification
P33M Mar 9, 2026
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mmc: sd: add fall-back extension register parsing attempt 
Several types of cards have a common bug where the vendor did not
populate the General Information block, but extension registers are
present at assumed function offsets, and the features are correctly
implemented.

Probe the offsets to see if valid data is returned.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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P33M committed Mar 5, 2026
commit ec1ef20dbf0684a8414bf54c1cdb419059f9473c
20 changes: 20 additions & 0 deletions drivers/mmc/core/sd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1218,6 +1218,26 @@ static int mmc_sd_read_ext_regs(struct mmc_card *card)
goto out;
}

/* Some cards have zeroes in GEN_INFO but correctly implement EXT_PERF and EXT_PWR */
if (!memcmp(card->ext_reg_buf, gen_info_buf, 512)) {
pr_info("%s: using fall-back extension register parsing\n",
mmc_hostname(card->host));
/* PWR typically hard-coded at FNO=1 */
err = sd_parse_ext_reg_power(card, 1, 0, 0);
if (err) {
pr_err("%s: error %d parsing SD Power extension\n",
mmc_hostname(card->host), err);
goto out;
}
/* PERF typically hard-coded at FNO=2 */
err = sd_parse_ext_reg_perf(card, 2, 0, 0);
if (err) {
pr_err("%s: error %d parsing SD Performance extension\n",
mmc_hostname(card->host), err);
}
goto out;
}

/* General info structure revision. */
memcpy(&rev, &gen_info_buf[0], 2);

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