From: Badal Nilawar <badal.nilawar@xxxxxxxxx>
APIs to enable and initialize VRSR feature.
Signed-off-by: Badal Nilawar <badal.nilawar@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
drivers/gpu/drm/xe/xe_device_types.h | 1 +
drivers/gpu/drm/xe/xe_pcode_api.h | 8 +++
drivers/gpu/drm/xe/xe_pm.c | 91 ++++++++++++++++++++++++++++
drivers/gpu/drm/xe/xe_pm.h | 3 +
4 files changed, 103 insertions(+)
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index c2ab2c91c968..da7946b75cd5 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -7,6 +7,7 @@
#define _XE_DEVICE_TYPES_H_
#include <linux/pci.h>
+#include <linux/pci-acpi.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
diff --git a/drivers/gpu/drm/xe/xe_pcode_api.h b/drivers/gpu/drm/xe/xe_pcode_api.h
index 2bae9afdbd35..17a90b2c6737 100644
--- a/drivers/gpu/drm/xe/xe_pcode_api.h
+++ b/drivers/gpu/drm/xe/xe_pcode_api.h
@@ -42,6 +42,14 @@
#define POWER_SETUP_I1_SHIFT 6 /* 10.6 fixed point format */
#define POWER_SETUP_I1_DATA_MASK REG_GENMASK(15, 0)
+#define PCODE_D3_VRAM_SELF_REFRESH 0x71
+#define PCODE_D3_VRSR_SC_DISABLE 0x0
+#define PCODE_D3_VRSR_SC_ENABLE 0x1
+#define PCODE_D3_VRSR_SC_AUX_PL_AND_PERST_DELAY 0x2
+#define PCODE_D3_VRSR_PERST_SHIFT 16
+#define POWER_D3_VRSR_PSERST_MASK REG_GENMASK(31, 16)
+#define POWER_D3_VRSR_AUX_PL_MASK REG_GENMASK(15, 0)
+
#define PCODE_FREQUENCY_CONFIG 0x6e
/* Frequency Config Sub Commands (param1) */
#define PCODE_MBOX_FC_SC_READ_FUSED_P0 0x0
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index dead236355d8..32583651988f 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -23,6 +23,7 @@
#include "xe_guc.h"
#include "xe_irq.h"
#include "xe_mmio.h"
+#include "xe_pcode_api.h"
#include "xe_pcode.h"
#include "xe_pxp.h"
#include "regs/xe_regs.h"
@@ -85,6 +86,92 @@ static struct lockdep_map xe_pm_runtime_nod3cold_map = {
};
#endif
+/**
+ * xe_pm_init_vrsr - Initialize VRAM self refresh
+ * @xe: The xe device
+ *
+ * This function reads the AUX power and PERST assertion delay from pcode.
+ * Then request host BIOS via ACPI _DSM to grant required AUX power and PERST
+ * assertion delay.
+ *
+ * Return: returns 0 on success and errno on failure
+ */
+int xe_pm_init_vrsr(struct xe_device *xe)
+{
+ struct xe_tile *root_tile = xe_device_get_root_tile(xe);
+ struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+ struct pci_dev *root_pdev;
+ int ret;
+ u32 uval;
+ u32 aux_pwr_limit;
+ u32 perst_delay;
+
+ root_pdev = pcie_find_root_port(pdev);
+ if (!root_pdev)
+ return -EINVAL;
+
+ /* Avoid Illegal Subcommand error */
+ if (xe->info.platform != XE_BATTLEMAGE)
+ return -ENXIO;
+
+ ret = xe_pcode_read(root_tile, PCODE_MBOX(PCODE_D3_VRAM_SELF_REFRESH,
+ PCODE_D3_VRSR_SC_AUX_PL_AND_PERST_DELAY, 0),
+ &uval, NULL);
+
+ if (ret)
+ return ret;
+
+ aux_pwr_limit = REG_FIELD_GET(POWER_D3_VRSR_AUX_PL_MASK, uval);
+ perst_delay = REG_FIELD_GET(POWER_D3_VRSR_PSERST_MASK, uval);
+
+ drm_dbg(&xe->drm, "AUX POWER LIMIT =%d\n", aux_pwr_limit);
+ drm_dbg(&xe->drm, "PERST Assertion delay =%d\n", perst_delay);
+
+ ret = pci_acpi_request_d3cold_aux_power(root_pdev, aux_pwr_limit);
+ if (ret)
+ goto vrsr;
+
+ ret = pci_acpi_add_perst_assertion_delay(root_pdev, perst_delay);
+ if (ret)
+ goto vrsr;
+
+ return ret;
+
+vrsr:
+ drm_err(&xe->drm, "ACPI DSM failed, VRSR is not capable\n");
+ xe->d3cold.vrsr_capable = false;
+ return ret;
+}
+
+/**
+ * xe_pm_enable_vrsr - Enable VRAM self refresh
+ * @xe: The xe device.
+ * @enable: true: Enable, false: Disable
+ *
+ * This function enables the VRSR feature in D3Cold path.
+ *
+ * Return: It returns 0 on success and errno on failure.
+ */
+int xe_pm_enable_vrsr(struct xe_device *xe, bool enable)
+{
+ struct xe_tile *root_tile = xe_device_get_root_tile(xe);
+ int ret;
+ u32 uval = 0;
+
+ /* Avoid Illegal Subcommand error */
+ if (xe->info.platform != XE_BATTLEMAGE)
+ return -ENXIO;
+
+ if (enable)
+ ret = xe_pcode_write(root_tile, PCODE_MBOX(PCODE_D3_VRAM_SELF_REFRESH,
+ PCODE_D3_VRSR_SC_ENABLE, 0), uval);
+ else
+ ret = xe_pcode_write(root_tile, PCODE_MBOX(PCODE_D3_VRAM_SELF_REFRESH,
+ PCODE_D3_VRSR_SC_DISABLE, 0), uval);
+
+ return ret;
+}
+
/**
* xe_rpm_reclaim_safe() - Whether runtime resume can be done from reclaim context
* @xe: The xe device.
@@ -330,6 +417,10 @@ int xe_pm_init(struct xe_device *xe)
return err;
xe->d3cold.vrsr_capable = xe_pm_vrsr_capable(xe);
+ if (xe->d3cold.vrsr_capable) {
+ drm_dbg(&xe->drm, "vram sr capable\n");
+ xe_pm_init_vrsr(xe);
+ }
}
xe_pm_runtime_init(xe);
diff --git a/drivers/gpu/drm/xe/xe_pm.h b/drivers/gpu/drm/xe/xe_pm.h
index 998d1ed64556..c9f176912b46 100644
--- a/drivers/gpu/drm/xe/xe_pm.h
+++ b/drivers/gpu/drm/xe/xe_pm.h
@@ -35,4 +35,7 @@ bool xe_rpm_reclaim_safe(const struct xe_device *xe);
struct task_struct *xe_pm_read_callback_task(struct xe_device *xe);
int xe_pm_module_init(void);
+int xe_pm_init_vrsr(struct xe_device *xe);
+int xe_pm_enable_vrsr(struct xe_device *xe, bool enable);
+
#endif
--
2.34.1
