Hi Daniel,
Intentional.
if no vqmmc regulator then just assume it will work.
if there is a regulator it needs to support 1.8V. (If I remember correctly UHS mode require 1.8V vccq) I need to check if we 1.2V should be allowed but it was not in the spec that I had.
Are you thinking we need 1.2V support ?
regards,
Philip
On Oct 30, 2012, at 9:30 PM, Daniel Drake <dsd@xxxxxxxxxx> wrote:
> 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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