6.8-stable review patch. If anyone has any objections, please let me know.
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From: Maksim Kiselev bigunclemax@gmail.com
commit ace323f80b9bc6734289a4e8a77938a3ce964c7d upstream.
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@pdp7.com Tested-by: Xi Ruoyao xry111@xry111.site Signed-off-by: Maksim Kiselev bigunclemax@gmail.com Acked-by: Adrian Hunter adrian.hunter@intel.com Fixes: 43658a542ebf ("mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240402093539.184287-1-bigunclemax@gmail.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/sdhci-of-dwcmshc.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -612,6 +612,7 @@ static int th1520_execute_tuning(struct
/* 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 */