blob: 2093fc7949e1fae3f385bf1a649c49dd58ef3816 [file] [log] [blame]
From 8ba911fd25c8f41979533f6911f8221181fcefae Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 13 Dec 2013 13:57:34 -0800
Subject: PENDING: mmc: sdhci-pci: Fix BYT sd card getting stuck in runtime
suspend
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@intel.com>
From http://marc.info/?l=linux-mmc&m=138676702327057
Do not apply the following without this patch:
7396e318b497cd46eb156effa5278126582ddde7
"mmc: sdhci-pci: support runtime PM for BYT SD cards"
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
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 d7d6bc8968d2..33593e7a6457 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -59,6 +59,7 @@ 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 *);
@@ -290,6 +291,7 @@ 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 = {
@@ -354,6 +356,7 @@ 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 */
@@ -1381,6 +1384,14 @@ 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:
--
1.8.5.rc3