[PATCH v2 16/22] HID: intel-thc-hid: intel-quickspi: Add PM implementation

[Even Xu <even.xu@intel.com>]

Implement THC QuickSPI driver power management callbacks.

Co-developed-by: Xinpeng Sun <xinpeng.sun@intel.com>
Signed-off-by: Xinpeng Sun <xinpeng.sun@intel.com>
Signed-off-by: Even Xu <even.xu@intel.com>
Tested-by: Rui Zhang <rui1.zhang@intel.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 .../intel-quickspi/pci-quickspi.c             | 246 ++++++++++++++++++
 .../intel-quickspi/quickspi-dev.h             |   8 +
 .../intel-quickspi/quickspi-hid.c             |   8 +
 3 files changed, 262 insertions(+)

diff --git a/drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c b/drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c
index 73be89933f1e..9c0df1163bcd 100644
--- a/drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c
+++ b/drivers/hid/intel-thc-hid/intel-quickspi/pci-quickspi.c
@@ -9,6 +9,7 @@
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
 #include <linux/pci.h>
+#include <linux/pm_runtime.h>
 
 #include "intel-thc-dev.h"
 #include "intel-thc-hw.h"
@@ -281,6 +282,10 @@ static irqreturn_t quickspi_irq_thread_handler(int irq, void *dev_id)
 	if (qsdev->state == QUICKSPI_DISABLED)
 		return IRQ_HANDLED;
 
+	ret = pm_runtime_resume_and_get(qsdev->dev);
+	if (ret)
+		return IRQ_HANDLED;
+
 	int_mask = thc_interrupt_handler(qsdev->thc_hw);
 
 	if (int_mask & BIT(THC_FATAL_ERR_INT) || int_mask & BIT(THC_TXN_ERR_INT)) {
@@ -318,6 +323,9 @@ static irqreturn_t quickspi_irq_thread_handler(int irq, void *dev_id)
 		if (try_recover(qsdev))
 			qsdev->state = QUICKSPI_DISABLED;
 
+	pm_runtime_mark_last_busy(qsdev->dev);
+	pm_runtime_put_autosuspend(qsdev->dev);
+
 	return IRQ_HANDLED;
 }
 
@@ -641,6 +649,13 @@ static int quickspi_probe(struct pci_dev *pdev,
 
 	qsdev->state = QUICKSPI_ENABLED;
 
+	/* Enable runtime power management */
+	pm_runtime_use_autosuspend(qsdev->dev);
+	pm_runtime_set_autosuspend_delay(qsdev->dev, DEFAULT_AUTO_SUSPEND_DELAY_MS);
+	pm_runtime_mark_last_busy(qsdev->dev);
+	pm_runtime_put_noidle(qsdev->dev);
+	pm_runtime_put_autosuspend(qsdev->dev);
+
 	dev_dbg(&pdev->dev, "QuickSPI probe success\n");
 
 	return 0;
@@ -677,6 +692,8 @@ static void quickspi_remove(struct pci_dev *pdev)
 	quickspi_hid_remove(qsdev);
 	quickspi_dma_deinit(qsdev);
 
+	pm_runtime_get_noresume(qsdev->dev);
+
 	quickspi_dev_deinit(qsdev);
 
 	pcim_iounmap_regions(pdev, BIT(0));
@@ -707,6 +724,234 @@ static void quickspi_shutdown(struct pci_dev *pdev)
 	quickspi_dev_deinit(qsdev);
 }
 
+static int quickspi_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	ret = quickspi_set_power(qsdev, HIDSPI_SLEEP);
+	if (ret)
+		return ret;
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, true);
+	if (ret)
+		return ret;
+
+	thc_interrupt_enable(qsdev->thc_hw, false);
+
+	thc_dma_unconfigure(qsdev->thc_hw);
+
+	return 0;
+}
+
+static int quickspi_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	ret = thc_port_select(qsdev->thc_hw, THC_PORT_TYPE_SPI);
+	if (ret)
+		return ret;
+
+	thc_interrupt_config(qsdev->thc_hw);
+
+	thc_interrupt_enable(qsdev->thc_hw, true);
+
+	ret = thc_dma_configure(qsdev->thc_hw);
+	if (ret)
+		return ret;
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, false);
+	if (ret)
+		return ret;
+
+	ret = quickspi_set_power(qsdev, HIDSPI_ON);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int quickspi_freeze(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, true);
+	if (ret)
+		return ret;
+
+	thc_interrupt_enable(qsdev->thc_hw, false);
+
+	thc_dma_unconfigure(qsdev->thc_hw);
+
+	return 0;
+}
+
+static int quickspi_thaw(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	ret = thc_dma_configure(qsdev->thc_hw);
+	if (ret)
+		return ret;
+
+	thc_interrupt_enable(qsdev->thc_hw, true);
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, false);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int quickspi_poweroff(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, true);
+	if (ret)
+		return ret;
+
+	thc_interrupt_enable(qsdev->thc_hw, false);
+
+	thc_ltr_unconfig(qsdev->thc_hw);
+
+	quickspi_dma_deinit(qsdev);
+
+	return 0;
+}
+
+static int quickspi_restore(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+	int ret;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	/* Reconfig THC HW when back from hibernate */
+	ret = thc_port_select(qsdev->thc_hw, THC_PORT_TYPE_SPI);
+	if (ret)
+		return ret;
+
+	thc_spi_input_output_address_config(qsdev->thc_hw,
+					    qsdev->input_report_hdr_addr,
+					    qsdev->input_report_bdy_addr,
+					    qsdev->output_report_addr);
+
+	ret = thc_spi_read_config(qsdev->thc_hw, qsdev->spi_freq_val,
+				  qsdev->spi_read_io_mode,
+				  qsdev->spi_read_opcode,
+				  qsdev->spi_packet_size);
+	if (ret)
+		return ret;
+
+	ret = thc_spi_write_config(qsdev->thc_hw, qsdev->spi_freq_val,
+				   qsdev->spi_write_io_mode,
+				   qsdev->spi_write_opcode,
+				   qsdev->spi_packet_size,
+				   qsdev->performance_limit);
+	if (ret)
+		return ret;
+
+	thc_interrupt_config(qsdev->thc_hw);
+
+	thc_interrupt_enable(qsdev->thc_hw, true);
+
+	ret = thc_interrupt_quiesce(qsdev->thc_hw, false);
+	if (ret)
+		return ret;
+
+	/* TIC may lose power, needs go through reset flow */
+	ret = reset_tic(qsdev);
+	if (ret)
+		return ret;
+
+	ret = thc_dma_configure(qsdev->thc_hw);
+	if (ret)
+		return ret;
+
+	thc_ltr_config(qsdev->thc_hw,
+		       qsdev->active_ltr_val,
+		       qsdev->low_power_ltr_val);
+
+	thc_change_ltr_mode(qsdev->thc_hw, THC_LTR_MODE_ACTIVE);
+
+	return 0;
+}
+
+static int quickspi_runtime_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	thc_change_ltr_mode(qsdev->thc_hw, THC_LTR_MODE_LP);
+
+	pci_save_state(pdev);
+
+	return 0;
+}
+
+static int quickspi_runtime_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct quickspi_device *qsdev;
+
+	qsdev = pci_get_drvdata(pdev);
+	if (!qsdev)
+		return -ENODEV;
+
+	thc_change_ltr_mode(qsdev->thc_hw, THC_LTR_MODE_ACTIVE);
+
+	return 0;
+}
+
+static const struct dev_pm_ops quickspi_pm_ops = {
+	.suspend = quickspi_suspend,
+	.resume = quickspi_resume,
+	.freeze = quickspi_freeze,
+	.thaw = quickspi_thaw,
+	.poweroff = quickspi_poweroff,
+	.restore = quickspi_restore,
+	.runtime_suspend = quickspi_runtime_suspend,
+	.runtime_resume = quickspi_runtime_resume,
+	.runtime_idle = NULL,
+};
+
 static const struct pci_device_id quickspi_pci_tbl[] = {
 	{PCI_DEVICE_DATA(INTEL, THC_MTL_DEVICE_ID_SPI_PORT1, &mtl), },
 	{PCI_DEVICE_DATA(INTEL, THC_MTL_DEVICE_ID_SPI_PORT2, &mtl), },
@@ -726,6 +971,7 @@ static struct pci_driver quickspi_driver = {
 	.probe = quickspi_probe,
 	.remove = quickspi_remove,
 	.shutdown = quickspi_shutdown,
+	.driver.pm = &quickspi_pm_ops,
 	.driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 };
 
diff --git a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h
index 49b0322b9ebb..c7400667cd70 100644
--- a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h
+++ b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-dev.h
@@ -47,6 +47,14 @@
 #define MAX_PACKET_SIZE_VALUE_MTL			128
 #define MAX_PACKET_SIZE_VALUE_LNL			256
 
+/*
+ * THC uses runtime auto suspend to dynamically switch between THC active LTR
+ * and low power LTR to save CPU power.
+ * Default value is 5000ms, that means if no touch event in this time, THC will
+ * change to low power LTR mode.
+ */
+#define DEFAULT_AUTO_SUSPEND_DELAY_MS			5000
+
 enum quickspi_dev_state {
 	QUICKSPI_NONE,
 	QUICKSPI_RESETING,
diff --git a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-hid.c b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-hid.c
index 2553d4b42b51..ad52e402c28a 100644
--- a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-hid.c
+++ b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-hid.c
@@ -3,6 +3,7 @@
 
 #include <linux/hid.h>
 #include <linux/input.h>
+#include <linux/pm_runtime.h>
 
 #include "quickspi-dev.h"
 #include "quickspi-hid.h"
@@ -54,6 +55,10 @@ static int quickspi_hid_raw_request(struct hid_device *hid,
 	struct quickspi_device *qsdev = hid->driver_data;
 	int ret = 0;
 
+	ret = pm_runtime_resume_and_get(qsdev->dev);
+	if (ret)
+		return ret;
+
 	switch (reqtype) {
 	case HID_REQ_GET_REPORT:
 		ret = quickspi_get_report(qsdev, rtype, reportnum, buf);
@@ -66,6 +71,9 @@ static int quickspi_hid_raw_request(struct hid_device *hid,
 		break;
 	}
 
+	pm_runtime_mark_last_busy(qsdev->dev);
+	pm_runtime_put_autosuspend(qsdev->dev);
+
 	return ret;
 }
 
-- 
2.40.1