sd: sdmmc: only with to 4 bit, if supported by host

maass-hamburg · cfriedt · commit e88be20d52b6 · 2025-10-03T20:59:01.000-04:00
only switch to 4 bit mode, if it is supported
by the host. for MMC it is already checked,
but not for the sd card.

Signed-off-by: Fin Maaß &lt;f.maass@vogl-electronic.com&gt;
diff --git a/subsys/sd/sdmmc.c b/subsys/sd/sdmmc.c
@@ -591,7 +591,7 @@ static int sdmmc_init_hs(struct sd_card *card)
 		LOG_ERR("Failed to switch card to HS mode");
 		return ret;
 	}
-	if (card->flags & SD_4BITS_WIDTH) {
+	if (card->host_props.host_caps.bus_4_bit_support && (card->flags & SD_4BITS_WIDTH)) {
 		/* Raise bus width to 4 bits */
 		ret = sdmmc_set_bus_width(card, SDHC_BUS_WIDTH4BIT);
 		if (ret) {

Original file line number	Diff line number	Diff line change
`@@ -591,7 +591,7 @@ static int sdmmc_init_hs(struct sd_card *card)`
`591`	`591`	`LOG_ERR("Failed to switch card to HS mode");`
`592`	`592`	`return ret;`
`593`	`593`	`}`
`594`		`- if (card->flags & SD_4BITS_WIDTH) {`
	`594`	`+ if (card->host_props.host_caps.bus_4_bit_support && (card->flags & SD_4BITS_WIDTH)) {`
`595`	`595`	`/* Raise bus width to 4 bits */`
`596`	`596`	`ret = sdmmc_set_bus_width(card, SDHC_BUS_WIDTH4BIT);`
`597`	`597`	`if (ret) {`