[PATCH AUTOSEL 5.15 16/28] HID: amd_sfh: Add functionality to clear interrupts

Sasha Levin
2022-02-23T02:32:13Z

From: Basavaraj Natikar <Basavaraj.Natikar@amd.com>

[ Upstream commit fb75a3791a8032848c987db29b622878d8fe2b1c ]

Newer AMD platforms with SFH may generate interrupts on some events
which are unwarranted. Until this is cleared the actual MP2 data
processing maybe stalled in some cases.

Add a mechanism to clear the pending interrupts (if any) during the
driver initialization and sensor command operations.

Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hid/amd-sfh-hid/amd_sfh_pcie.c | 25 ++++++++++++++++++++++++-
drivers/hid/amd-sfh-hid/amd_sfh_pcie.h | 1 +
2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
index 6eda5006fb116..205827ecf4b8f 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -88,6 +88,20 @@ static void amd_stop_all_sensor_v2(struct amd_mp2_dev *privdata)
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
}

+static void amd_sfh_clear_intr_v2(struct amd_mp2_dev *privdata)
+{
+ if (readl(privdata->mmio + AMD_P2C_MSG(4))) {
+ writel(0, privdata->mmio + AMD_P2C_MSG(4));
+ writel(0xf, privdata->mmio + AMD_P2C_MSG(5));
+ }
+}
+
+static void amd_sfh_clear_intr(struct amd_mp2_dev *privdata)
+{
+ if (privdata->mp2_ops->clear_intr)
+ privdata->mp2_ops->clear_intr(privdata);
+}
+
void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
{
union sfh_cmd_param cmd_param;
@@ -192,6 +206,7 @@ static void amd_mp2_pci_remove(void *privdata)
struct amd_mp2_dev *mp2 = privdata;
amd_sfh_hid_client_deinit(privdata);
mp2->mp2_ops->stop_all(mp2);
+ amd_sfh_clear_intr(mp2);
}

static const struct amd_mp2_ops amd_sfh_ops_v2 = {
@@ -199,6 +214,7 @@ static const struct amd_mp2_ops amd_sfh_ops_v2 = {
.stop = amd_stop_sensor_v2,
.stop_all = amd_stop_all_sensor_v2,
.response = amd_sfh_wait_response_v2,
+ .clear_intr = amd_sfh_clear_intr_v2,
};

static const struct amd_mp2_ops amd_sfh_ops = {
@@ -258,8 +274,13 @@ static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
mp2_select_ops(privdata);

rc = amd_sfh_hid_client_init(privdata);
- if (rc)
+ if (rc) {
+ amd_sfh_clear_intr(privdata);
+ dev_err(&pdev->dev, "amd_sfh_hid_client_init failed\n");
return rc;
+ }
+
+ amd_sfh_clear_intr(privdata);

return devm_add_action_or_reset(&pdev->dev, amd_mp2_pci_remove, privdata);
}
@@ -288,6 +309,7 @@ static int __maybe_unused amd_mp2_pci_resume(struct device *dev)
}

schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
+ amd_sfh_clear_intr(mp2);

return 0;
}
@@ -313,6 +335,7 @@ static int __maybe_unused amd_mp2_pci_suspend(struct device *dev)
}

cancel_delayed_work_sync(&cl_data->work_buffer);
+ amd_sfh_clear_intr(mp2);

return 0;
}
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
index 1ff6f83cb6fd1..0e7a2f22e1426 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
@@ -140,5 +140,6 @@ struct amd_mp2_ops {
void (*stop)(struct amd_mp2_dev *privdata, u16 sensor_idx);
void (*stop_all)(struct amd_mp2_dev *privdata);
int (*response)(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
+ void (*clear_intr)(struct amd_mp2_dev *privdata);
};
#endif
--
2.34.1