[PATCH v2 3/3] mmc: sdhci-acpi: Add DMI fix_up_power_blacklist

[Hans de Goede <hdegoede@redhat.com>]

Add a DMI based blacklist for systems where calling
acpi_device_fix_up_power() is harmful.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-Adjust for changes in mmc: sdhci-acpi: Add fix_up_power_blacklist module option
-Only use a single fix_up_power_dmi_blacklist for the GPDwin further testing
 has shown that the DMI strings are unique enough that we do not need the
 bios-date in there
---
 drivers/mmc/host/sdhci-acpi.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 5a73174..ba9e688 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -36,6 +36,7 @@
 #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>
@@ -384,6 +385,27 @@ static const struct acpi_device_id sdhci_acpi_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 
+static const struct dmi_system_id fix_up_power_dmi_blacklist[] = {
+	{
+		/*
+		 * Match for the GPDwin which unfortunately uses somewhat
+		 * generic dmi strings, which is why we test for 4 strings.
+		 * Comparing against 15 other byt/cht boards, board_vendor
+		 * and board_name are unique to the GPDwin, where as only one
+		 * other board has the same board_serial and 2 others have
+		 * the same default product_name.
+		 */
+		.driver_data = "80860F14:2",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+			DMI_MATCH(DMI_BOARD_NAME, "Default string"),
+			DMI_MATCH(DMI_BOARD_SERIAL, "Default string"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
+		},
+	},
+	{ }
+};
+
 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
 							 const char *uid)
 {
@@ -407,6 +429,7 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 	const char *fix_up_power_bl = fix_up_power_blacklist;
 	bool fix_up_power = true;
 	struct acpi_device *device, *child;
+	const struct dmi_system_id *dmi_id;
 	struct sdhci_acpi_host *c;
 	struct sdhci_host *host;
 	struct resource *iomem;
@@ -421,6 +444,12 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 	hid = acpi_device_hid(device);
 	uid = device->pnp.unique_id;
 
+	if (!fix_up_power_bl) {
+		dmi_id = dmi_first_match(fix_up_power_dmi_blacklist);
+		if (dmi_id)
+			fix_up_power_bl = dmi_id->driver_data;
+	}
+
 	if (sdhci_acpi_compare_hid_uid(fix_up_power_bl, hid, uid))
 		fix_up_power = false;
 
-- 
2.9.3