[PATCH] platform/x86/amd/pmf: Fix CnQF and auto-mode after resume

[Mario Limonciello]

After suspend/resume cycle there is an error message and auto-mode
or CnQF stops working.

[ 5741.447511] amd-pmf AMDI0100:00: SMU cmd failed. err: 0xff
[ 5741.447523] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_RESPONSE:ff
[ 5741.447527] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_ARGUMENT:7
[ 5741.447531] amd-pmf AMDI0100:00: AMD_PMF_REGISTER_MESSAGE:16
[ 5741.447540] amd-pmf AMDI0100:00: [AUTO_MODE] avg power: 0 mW mode: QUIET

This is because the DRAM address used for accessing metrics table
needs to be refreshed after a suspend resume cycle. Add a resume
callback to reset this again.

Fixes: 1a409b35c995 ("platform/x86/amd/pmf: Get performance metrics from PMFW")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/platform/x86/amd/pmf/core.c | 32 ++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
index d5bb775dadcf..ee5f124f78b6 100644
--- a/drivers/platform/x86/amd/pmf/core.c
+++ b/drivers/platform/x86/amd/pmf/core.c
@@ -245,24 +245,29 @@ static const struct pci_device_id pmf_pci_ids[] = {
 	{ }
 };
 
-int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
+static void amd_pmf_set_dram_addr(struct amd_pmf_dev *dev)
 {
 	u64 phys_addr;
 	u32 hi, low;
 
-	INIT_DELAYED_WORK(&dev->work_buffer, amd_pmf_get_metrics);
+	phys_addr = virt_to_phys(dev->buf);
+	hi = phys_addr >> 32;
+	low = phys_addr & GENMASK(31, 0);
+
+	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_HIGH, 0, hi, NULL);
+	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_LOW, 0, low, NULL);
+}
 
+int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
+{
 	/* Get Metrics Table Address */
 	dev->buf = kzalloc(sizeof(dev->m_table), GFP_KERNEL);
 	if (!dev->buf)
 		return -ENOMEM;
 
-	phys_addr = virt_to_phys(dev->buf);
-	hi = phys_addr >> 32;
-	low = phys_addr & GENMASK(31, 0);
+	INIT_DELAYED_WORK(&dev->work_buffer, amd_pmf_get_metrics);
 
-	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_HIGH, 0, hi, NULL);
-	amd_pmf_send_cmd(dev, SET_DRAM_ADDR_LOW, 0, low, NULL);
+	amd_pmf_set_dram_addr(dev);
 
 	/*
 	 * Start collecting the metrics data after a small delay
@@ -273,6 +278,18 @@ int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev)
 	return 0;
 }
 
+static int amd_pmf_resume_handler(struct device *dev)
+{
+	struct amd_pmf_dev *pdev = dev_get_drvdata(dev);
+
+	if (pdev->buf)
+		amd_pmf_set_dram_addr(pdev);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(amd_pmf_pm, NULL, amd_pmf_resume_handler);
+
 static void amd_pmf_init_features(struct amd_pmf_dev *dev)
 {
 	int ret;
@@ -413,6 +430,7 @@ static struct platform_driver amd_pmf_driver = {
 		.name = "amd-pmf",
 		.acpi_match_table = amd_pmf_acpi_ids,
 		.dev_groups = amd_pmf_driver_groups,
+		.pm = pm_sleep_ptr(&amd_pmf_pm),
 	},
 	.probe = amd_pmf_probe,
 	.remove_new = amd_pmf_remove,
-- 
2.34.1