michaelh/zephyr
1
0
Fork 0
Code Releases Activity

sd: sdmmc: wait before sending second OCR

Browse source 
introduce a small wait between probing and initialization OCR. This
delay fixes a failure to initialize seen on some SD cards

Fixes #47238

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2022-08-08 10:06:05 -05:00 • committed by Carles Cufí
commit ba9220c5bd
1 changed files with 5 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

5
subsys/sd/sdmmc.c
View file

@ -998,6 +998,11 @@ int sdmmc_card_init(struct sd_card *card)
ocr_arg |= SD_OCR_VDD29_30FLAG;
}
ocr_arg |= (SD_OCR_VDD32_33FLAG | SD_OCR_VDD33_34FLAG);
/* Momentary delay before initialization OCR. Some cards will
* never leave busy state if init OCR is sent too soon after
* probing OCR
*/
k_busy_wait(100);
/* Send SD OCR to card to initialize it */
ret = sdmmc_send_ocr(card, ocr_arg);
} else {