drm/amdgpu: add wait_for helper for spirom update

Spirom update typically requires extremely long
duration for command execution, and special helper
function to wait for it completion.

Signed-off-by: Likun Gao <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c

···
 	return -ETIME;
 }
 
+int psp_wait_for_spirom_update(struct psp_context *psp, uint32_t reg_index,
+			       uint32_t reg_val, uint32_t mask, uint32_t msec_timeout)
+{
+	uint32_t val;
+	int i;
+	struct amdgpu_device *adev = psp->adev;
+
+	if (psp->adev->no_hw_access)
+		return 0;
+
+	for (i = 0; i < msec_timeout; i++) {
+		val = RREG32(reg_index);
+		if ((val & mask) == reg_val)
+			return 0;
+		msleep(1);
+	}
+
+	return -ETIME;
+}
+
 static const char *psp_gfx_cmd_name(enum psp_gfx_cmd_id cmd_id)
 {
 	switch (cmd_id) {

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h

···
 
 extern int psp_wait_for(struct psp_context *psp, uint32_t reg_index,
 			uint32_t field_val, uint32_t mask, bool check_changed);
+extern int psp_wait_for_spirom_update(struct psp_context *psp, uint32_t reg_index,
+			uint32_t field_val, uint32_t mask, uint32_t msec_timeout);
 
 int psp_gpu_reset(struct amdgpu_device *adev);
 int psp_update_vcn_sram(struct amdgpu_device *adev, int inst_idx,

drivers/gpu/drm/amd/amdgpu/psp_v13_0.c

···
 	WREG32_SOC15(MP0, 0, regMP0_SMN_C2PMSG_73, 1);
 
 	if (cmd == C2PMSG_CMD_SPI_UPDATE_FLASH_IMAGE)
-		return 0;
-
-	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, regMP0_SMN_C2PMSG_115),
-				MBOX_READY_FLAG, MBOX_READY_MASK, false);
+		ret = psp_wait_for_spirom_update(psp, SOC15_REG_OFFSET(MP0, 0, regMP0_SMN_C2PMSG_115),
+						 MBOX_READY_FLAG, MBOX_READY_MASK, PSP_SPIROM_UPDATE_TIMEOUT);
+	else
+		ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, regMP0_SMN_C2PMSG_115),
+				   MBOX_READY_FLAG, MBOX_READY_MASK, false);
 	if (ret) {
 		dev_err(adev->dev, "SPI cmd %x timed out, ret = %d", cmd, ret);
 		return ret;

drivers/gpu/drm/amd/amdgpu/psp_v13_0.h

···
 
 #include "amdgpu_psp.h"
 
+#define PSP_SPIROM_UPDATE_TIMEOUT   60000   /* 60s */
+
 void psp_v13_0_set_psp_funcs(struct psp_context *psp);
 
 #endif