[PATCH 2/2] drm/amdgpu: avoid unnecessary SMC firmware reloading

[Evan Quan]

E.g. During non-RAS baco reset, the SMC is still alive.
Thus there is no need to reload the SMC firmware.

Change-Id: I73f6284541d0ca0e82761380a27e32484fb0061c
Signed-off-by: Evan Quan <evan.quan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/psp_v11_0.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
index c66ca8cc2ebd..ba761e9366e3 100644
--- a/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v11_0.c
@@ -676,6 +676,19 @@ static bool psp_v11_0_compare_sram_data(struct psp_context *psp,
 	return true;
 }
 
+/*
+ * Check whether SMU is still alive. If that's true
+ * (e.g. for non-RAS baco reset), we need to skip SMC firmware reloading.
+ */
+static bool psp_v11_0_smu_reload_quirk(struct psp_context *psp)
+{
+	struct amdgpu_device *adev = psp->adev;
+	uint32_t reg;
+
+	reg = RREG32_PCIE(smnMP1_FIRMWARE_FLAGS | 0x03b00000);
+	return (reg & MP1_FIRMWARE_FLAGS__INTERRUPTS_ENABLED_MASK) ? true : false;
+}
+
 static int psp_v11_0_mode1_reset(struct psp_context *psp)
 {
 	int ret;
@@ -1070,6 +1083,7 @@ static const struct psp_funcs psp_v11_0_funcs = {
 	.ring_stop = psp_v11_0_ring_stop,
 	.ring_destroy = psp_v11_0_ring_destroy,
 	.compare_sram_data = psp_v11_0_compare_sram_data,
+	.smu_reload_quirk = psp_v11_0_smu_reload_quirk,
 	.mode1_reset = psp_v11_0_mode1_reset,
 	.xgmi_get_topology_info = psp_v11_0_xgmi_get_topology_info,
 	.xgmi_set_topology_info = psp_v11_0_xgmi_set_topology_info,
-- 
2.24.0