Commit 0f7b79a4 authored by Raul E Rangel's avatar Raul E Rangel Committed by Ulf Hansson
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mmc: sdhci: sdhci-pci-o2micro: Correctly set bus width when tuning

The O2Micro controller only supports tuning at 4-bits. So the host driver
needs to change the bus width while tuning and then set it back when done.

There was a bug in the original implementation in that mmc->ios.bus_width
also wasn't updated. Thus setting the incorrect blocksize in
sdhci_send_tuning which results in a tuning failure.

Signed-off-by: default avatarRaul E Rangel <>
Fixes: 0086fc21

 ("mmc: sdhci: Add support for O2 hardware tuning")
Acked-by: default avatarAdrian Hunter <>
Signed-off-by: default avatarUlf Hansson <>
parent 65dade60
......@@ -115,6 +115,7 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
current_bus_width = mmc->ios.bus_width;
mmc->ios.bus_width = MMC_BUS_WIDTH_4;
sdhci_set_bus_width(host, MMC_BUS_WIDTH_4);
......@@ -126,8 +127,10 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
if (current_bus_width == MMC_BUS_WIDTH_8)
if (current_bus_width == MMC_BUS_WIDTH_8) {
mmc->ios.bus_width = MMC_BUS_WIDTH_8;
sdhci_set_bus_width(host, current_bus_width);
host->flags &= ~SDHCI_HS400_TUNING;
return 0;
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