Hi
For some reason this email doesn't seem to get
onto the mailing lists. I am trying to figure out
why.
On 11/12/13 14:21, Adrian Hunter wrote:
> A host controller for a SD card may need a GPIO
> for card detect in order to wake up from runtime
> suspend when a card is inserted. If that GPIO is
> not configured, then the host controller will not
> wake up. Fix that for the affected devices by not
> enabling runtime PM unless the GPIO is successfully
> set up.
>
> This affects BYT sd card host controller which had
> runtime PM enabled from v3.11. For completeness,
> the MFD sd card host controller is flagged also.
>
> Tested on v3.11.10 and v3.12.4 although the patch
> applies with some offsets and fuzz.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.11+
> ---
> drivers/mmc/host/sdhci-pci.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
> index 8f75381..7b930e6 100644
> --- a/drivers/mmc/host/sdhci-pci.c
> +++ b/drivers/mmc/host/sdhci-pci.c
> @@ -65,6 +65,7 @@ struct sdhci_pci_fixes {
> unsigned int quirks;
> unsigned int quirks2;
> bool allow_runtime_pm;
> + bool own_cd_for_runtime_pm;
>
> int (*probe) (struct sdhci_pci_chip *);
>
> @@ -296,6 +297,7 @@ static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1_hc2 = {
> static const struct sdhci_pci_fixes sdhci_intel_mfd_sd = {
> .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
> .allow_runtime_pm = true,
> + .own_cd_for_runtime_pm = true,
> };
>
> static const struct sdhci_pci_fixes sdhci_intel_mfd_sdio = {
> @@ -360,6 +362,7 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_sdio = {
> static const struct sdhci_pci_fixes sdhci_intel_byt_sd = {
> .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
> .allow_runtime_pm = true,
> + .own_cd_for_runtime_pm = true,
> };
>
> /* Define Host controllers for Intel Merrifield platform */
> @@ -1457,6 +1460,14 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
>
> sdhci_pci_add_own_cd(slot);
>
> + /*
> + * Check if the chip needs a separate GPIO for card detect to wake up
> + * from runtime suspend. If it is not there, don't allow runtime PM.
> + * Note sdhci_pci_add_own_cd() sets slot->cd_gpio to -EINVAL on failure.
> + */
> + if (chip->fixes->own_cd_for_runtime_pm && !gpio_is_valid(slot->cd_gpio))
> + chip->allow_runtime_pm = false;
> +
> return slot;
>
> remove:
>
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