If the motherboard is known not to support 1.8V properly, add the
necessary quirk on probe.
This fixes an issue on a Gemini Lake (GLK) laptop : eMMC driver will
timeout on boot (from 60seconds to 10minutes ) as the cqhci attempts CQE
recovery after a failed voltage switch. In earlier kernels, the problem
existed, but only delayed boot for about 10 seconds after an I/O error,
allowing booting on the eMMC (almost) unnoticed.
Signed-off-by: Anisse Astier <anisse@xxxxxxxxx>
---
drivers/mmc/host/sdhci-pci-core.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 7bfd366d970d..396413f7c854 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -29,6 +29,7 @@
#include <linux/mmc/slot-gpio.h>
#include <linux/mmc/sdhci-pci-data.h>
#include <linux/acpi.h>
+#include <linux/dmi.h>
#include "cqhci.h"
@@ -703,6 +704,16 @@ static int intel_execute_tuning(struct mmc_host *mmc, u32 opcode)
return 0;
}
+static const struct dmi_system_id board_no_1_8v[] = {
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N75_77GU"),
+ },
+ },
+ { }
+};
+
static void byt_probe_slot(struct sdhci_pci_slot *slot)
{
struct mmc_host_ops *ops = &slot->host->mmc_host_ops;
@@ -710,6 +721,12 @@ static void byt_probe_slot(struct sdhci_pci_slot *slot)
byt_read_dsm(slot);
ops->execute_tuning = intel_execute_tuning;
+
+ if (dmi_check_system(board_no_1_8v)) {
+ pr_debug("%s: motherboard does not support 1.8V\n",
+ mmc_hostname(slot->host->mmc));
+ slot->host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
+ }
ops->start_signal_voltage_switch = intel_start_signal_voltage_switch;
}
--
2.17.2
