Hi Marek,
On Tue, Nov 13 2012, Marek Szyprowski wrote:
> Fixed regulators cannot change their voltage, so disable all voltage
> range checking for them, otherwise the driver fails to operate with
> fixed regulators. Up to now it worked only by luck, because
> regulator_is_supported_voltage() function returned incorrect values.
> Commit "regulator: fix voltage check in regulator_is_supported_voltage()"
> fixed that function and now additional check is needed for fixed
> regulators.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index c7851c0..6f6534e 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2923,7 +2923,7 @@ int sdhci_add_host(struct sdhci_host *host)
> regulator_enable(host->vmmc);
>
> #ifdef CONFIG_REGULATOR
> - if (host->vmmc) {
> + if (host->vmmc && regulator_count_voltages(host->vmmc) > 1) {
> ret = regulator_is_supported_voltage(host->vmmc, 3300000,
> 3300000);
> if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
Thanks for the longer explanation. I'm still missing something, though;
what's wrong with running the check as it was with the new regulator code?
(I haven't tried it yet.)
#ifdef CONFIG_REGULATOR
if (host->vmmc) {
ret = regulator_is_supported_voltage(host->vmmc, 3300000,
3300000);
if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
caps[0] &= ~SDHCI_CAN_VDD_330;
ret = regulator_is_supported_voltage(host->vmmc, 3000000,
3000000);
if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300)))
caps[0] &= ~SDHCI_CAN_VDD_300;
ret = regulator_is_supported_voltage(host->vmmc, 1800000,
1800000);
if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180)))
caps[0] &= ~SDHCI_CAN_VDD_180;
}
#endif /* CONFIG_REGULATOR */
The point is to remove unsupported voltages, so if someone sets up a
fixed regulator at 3300000, all of the other caps are disabled. Why
wouldn't that work without this change, and how are we supposed to
remove those caps on a fixed regulator after your patchset?
Thanks, sorry if I'm missing something obvious,
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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