Hi,
Please check this commit:
commit 6231f3de1332b2a8a90e0c598ab6acc8f1eff7c1
Author: Philip Rakity <prakity@xxxxxxxxxxx>
Date: Mon Jul 23 15:56:23 2012 -0700
mmc: sdhci: Add regulator support for vccq (voltage regualor)
Particularly this hunk:
+ /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
+ host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc");
+ if (IS_ERR(host->vqmmc)) {
+ pr_info("%s: no vqmmc regulator found\n", mmc_hostname(mmc));
+ host->vqmmc = NULL;
+ }
+ else if (regulator_is_supported_voltage(host->vqmmc, 1800000, 1800000))
+ regulator_enable(host->vqmmc);
+ else
+ caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
+ SDHCI_SUPPORT_DDR50);
One effect of this code is that if the system has no vqmmc regulator,
the UHS-I flags are always cleared on the final line, so the ultra
speed mode is always disabled.
Is this intentional or is there a check missing?
Thanks
Daniel
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