linux-kernel - [PATCH AUTOSEL 4.19 013/209] ACPI / LPSS: Make acpi_lpss_find

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Date:   Tue, 12 Nov 2019 20:47:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-acpi@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 013/209] ACPI / LPSS: Make acpi_lpss_find_device() also find PCI devices

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 1e30124ac60abc41d74793900f8b4034f29bcb3d ]

On some Cherry Trail systems the GPU ACPI fwnode has power-resources which
point to the PMIC, which is connected over one of the LPSS I2C controllers.

To get the suspend/resume ordering correct for this we need to be able to
add device-links between the GPU and the I2c controller. The GPU is a PCI
device, so this requires acpi_lpss_find_device() to also work on PCI devs.

Tested-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/acpi/acpi_lpss.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index c651e206d7960..924b9f089e79f 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -16,6 +16,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/mutex.h>
+#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/clk-lpss.h>
 #include <linux/platform_data/x86/pmc_atom.h>
@@ -494,12 +495,18 @@ static int match_hid_uid(struct device *dev, void *data)
 
 static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
 {
+	struct device *dev;
+
 	struct hid_uid data = {
 		.hid = hid,
 		.uid = uid,
 	};
 
-	return bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
+	dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
+	if (dev)
+		return dev;
+
+	return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
 }
 
 static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
-- 
2.20.1