This is a note to let you know that I've just added the patch titled
mmc: sdhci-acpi: Switch signal voltage back to 3.3V on suspend on external microSD on Lenovo Miix 320
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-sdhci-acpi-switch-signal-voltage-back-to-3.3v-on.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f42b28c2b0945d814bb4cb62eebf807d0c32f976
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Mon Mar 16 19:47:52 2020 +0100
mmc: sdhci-acpi: Switch signal voltage back to 3.3V on suspend on external microSD on Lenovo Miix 320
[ Upstream commit 84d49b3d08a1d33690cc159036f381c31c27c17b ]
Based on a sample of 7 DSDTs from Cherry Trail devices using an AXP288
PMIC depending on the design one of 2 possible LDOs on the PMIC is used
for the MMC signalling voltage, either DLDO3 or GPIO1LDO (GPIO1 pin in
low noise LDO mode).
The Lenovo Miix 320-10ICR uses GPIO1LDO in the SHC1 ACPI device's DSM
methods to set 3.3 or 1.8 signalling voltage and this appears to work
as advertised, so presumably the device is actually using GPIO1LDO for
the external microSD signalling voltage.
But this device has a bug in the _PS0 method of the SHC1 ACPI device,
the DSM remembers the last set signalling voltage and the _PS0 restores
this after a (runtime) suspend-resume cycle, but it "restores" the voltage
on DLDO3 instead of setting it on GPIO1LDO as the DSM method does. DLDO3
is used for the LCD and setting it to 1.8V causes the LCD to go black.
This commit works around this issue by calling the Intel DSM to reset the
signal voltage to 3.3V after the host has been runtime suspended.
This will make the _PS0 method reprogram the DLDO3 voltage to 3.3V, which
leaves it at its original setting fixing the LCD going black.
This commit adds and uses a DMI quirk mechanism to only trigger this
workaround on the Lenovo Miix 320 while leaving the behavior of the
driver unchanged on other devices.
BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=111294
BugLink: https://gitlab.freedesktop.org/drm/intel/issues/355
Reported-by: russianneuromancer <russianneuromancer@xxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200316184753.393458-1-hdegoede@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Stable-dep-of: a92a73b1d924 ("mmc: sdhci-acpi: Sort DMI quirks alphabetically")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index a8d9a6037fe56..6a402367b1499 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -23,6 +23,7 @@
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
+#include <linux/dmi.h>
#include <linux/mmc/host.h>
#include <linux/mmc/pm.h>
@@ -72,9 +73,15 @@ struct sdhci_acpi_host {
const struct sdhci_acpi_slot *slot;
struct platform_device *pdev;
bool use_runtime_pm;
+ bool is_intel;
+ bool reset_signal_volt_on_suspend;
unsigned long private[0] ____cacheline_aligned;
};
+enum {
+ DMI_QUIRK_RESET_SD_SIGNAL_VOLT_ON_SUSP = BIT(0),
+};
+
static inline void *sdhci_acpi_priv(struct sdhci_acpi_host *c)
{
return (void *)c->private;
@@ -391,6 +398,8 @@ static int intel_probe_slot(struct platform_device *pdev, struct acpi_device *ad
host->mmc_host_ops.start_signal_voltage_switch =
intel_start_signal_voltage_switch;
+ c->is_intel = true;
+
return 0;
}
@@ -750,6 +759,24 @@ static const struct acpi_device_id sdhci_acpi_ids[] = {
};
MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
+static const struct dmi_system_id sdhci_acpi_quirks[] = {
+ {
+ /*
+ * The Lenovo Miix 320-10ICR has a bug in the _PS0 method of
+ * the SHC1 ACPI device, this bug causes it to reprogram the
+ * wrong LDO (DLDO3) to 1.8V if 1.8V modes are used and the
+ * card is (runtime) suspended + resumed. DLDO3 is used for
+ * the LCD and setting it to 1.8V causes the LCD to go black.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
+ },
+ .driver_data = (void *)DMI_QUIRK_RESET_SD_SIGNAL_VOLT_ON_SUSP,
+ },
+ {} /* Terminating entry */
+};
+
static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(struct acpi_device *adev)
{
const struct sdhci_acpi_uid_slot *u;
@@ -766,17 +793,23 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
const struct sdhci_acpi_slot *slot;
struct acpi_device *device, *child;
+ const struct dmi_system_id *id;
struct sdhci_acpi_host *c;
struct sdhci_host *host;
struct resource *iomem;
resource_size_t len;
size_t priv_size;
+ int quirks = 0;
int err;
device = ACPI_COMPANION(dev);
if (!device)
return -ENODEV;
+ id = dmi_first_match(sdhci_acpi_quirks);
+ if (id)
+ quirks = (long)id->driver_data;
+
slot = sdhci_acpi_get_slot(device);
/* Power on the SDHCI controller and its children */
@@ -862,6 +895,9 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
dev_warn(dev, "failed to setup card detect gpio\n");
c->use_runtime_pm = false;
}
+
+ if (quirks & DMI_QUIRK_RESET_SD_SIGNAL_VOLT_ON_SUSP)
+ c->reset_signal_volt_on_suspend = true;
}
err = sdhci_setup_host(host);
@@ -926,17 +962,39 @@ static int sdhci_acpi_remove(struct platform_device *pdev)
return 0;
}
+static void __maybe_unused sdhci_acpi_reset_signal_voltage_if_needed(
+ struct device *dev)
+{
+ struct sdhci_acpi_host *c = dev_get_drvdata(dev);
+ struct sdhci_host *host = c->host;
+
+ if (c->is_intel && c->reset_signal_volt_on_suspend &&
+ host->mmc->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_330) {
+ struct intel_host *intel_host = sdhci_acpi_priv(c);
+ unsigned int fn = INTEL_DSM_V33_SWITCH;
+ u32 result = 0;
+
+ intel_dsm(intel_host, dev, fn, &result);
+ }
+}
+
#ifdef CONFIG_PM_SLEEP
static int sdhci_acpi_suspend(struct device *dev)
{
struct sdhci_acpi_host *c = dev_get_drvdata(dev);
struct sdhci_host *host = c->host;
+ int ret;
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
- return sdhci_suspend_host(host);
+ ret = sdhci_suspend_host(host);
+ if (ret)
+ return ret;
+
+ sdhci_acpi_reset_signal_voltage_if_needed(dev);
+ return 0;
}
static int sdhci_acpi_resume(struct device *dev)
@@ -956,11 +1014,17 @@ static int sdhci_acpi_runtime_suspend(struct device *dev)
{
struct sdhci_acpi_host *c = dev_get_drvdata(dev);
struct sdhci_host *host = c->host;
+ int ret;
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
- return sdhci_runtime_suspend_host(host);
+ ret = sdhci_runtime_suspend_host(host);
+ if (ret)
+ return ret;
+
+ sdhci_acpi_reset_signal_voltage_if_needed(dev);
+ return 0;
}
static int sdhci_acpi_runtime_resume(struct device *dev)
