[PATCH 4.13 009/109] drm/amdgpu: read reg in each iterator of psp_wait_for loop

Greg Kroah-Hartman
2017-09-24T21:00:10Z

From: Zhang, Jerry <Jerry.Zhang@amd.com>

commit 2890decfd9969cac21067ca0c734fbccaf74d634 upstream.

v2: fix the SOS loading failure for PSP v3.1

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com> (v1)
Acked-by: Huang Rui <ray.huang@amd.com> (v1)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 3 +--
drivers/gpu/drm/amd/amdgpu/psp_v3_1.c | 2 --
2 files changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
@@ -95,9 +95,8 @@ int psp_wait_for(struct psp_context *psp
int i;
struct amdgpu_device *adev = psp->adev;

- val = RREG32(reg_index);
-
for (i = 0; i < adev->usec_timeout; i++) {
+ val = RREG32(reg_index);
if (check_changed) {
if (val != reg_val)
return 0;
--- a/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v3_1.c
@@ -237,11 +237,9 @@ int psp_v3_1_bootloader_load_sos(struct

/* there might be handshake issue with hardware which needs delay */
mdelay(20);
-#if 0
ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_81),
RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_81),
0, true);
-#endif

return ret;
}