commit 77a0122e0838663795651aa0beb2325156f98c09 upstream.
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.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Chris Ball <chris@xxxxxxxxxx>
---
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 611331a..f3541a0 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -58,6 +58,7 @@ 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 *);
@@ -287,6 +288,7 @@ 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 = {
@@ -334,6 +336,7 @@ 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,
};
/* O2Micro extra registers */
@@ -1344,6 +1347,14 @@ 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:
--
1.8.3.2
--
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