Fix SD card tuning error by increasing tuning loop count from 40(MAX_TUNING_LOOP) to 128. For some reason the tuning algorithm requires to move through all the taps of delay line even if the THRESHOLD_MODE (bit 2 in AT_CTRL_R) is used instead of the LARGEST_WIN_MODE. Tested-by: Drew Fustini <drew@xxxxxxxx> Tested-by: Xi Ruoyao <xry111@xxxxxxxxxxx> Signed-off-by: Maksim Kiselev <bigunclemax@xxxxxxxxx> --- Previous discussion was here: https://lore.kernel.org/lkml/CALHCpMhc1F5Ue7U_gsDXREHUZRVQJNYRCJxYxoNqbN=-39jf7A@xxxxxxxxxxxxxx/ drivers/mmc/host/sdhci-of-dwcmshc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index 8d6cfb648096..1001b6ea1a89 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -706,6 +706,7 @@ static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode) /* perform tuning */ sdhci_start_tuning(host); + host->tuning_loop_count = 128; host->tuning_err = __sdhci_execute_tuning(host, opcode); if (host->tuning_err) { /* disable auto-tuning upon tuning error */ -- 2.40.1
