[Intel-gfx] [PATCH 04/15] drm/i915/guc: Implement response handling in send_mmio()

[Michal Wajdeczko]

In addition to already returned small data encoded in the status MMIO,
GuC may write more additional data in remaining MMIO regs. Lets copy
all that regs into optionally provided response buffer.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/intel_uc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 77da750..c704968 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -517,6 +517,11 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
 			 " ret=%d status=0x%08X response=0x%08X\n",
 			 action[0], ret, status, I915_READ(SOFT_SCRATCH(15)));
 	} else {
+		if (response) {
+			/* Skip reg[0] with the status/response mask */
+			for (i = 1; i < guc->send_regs.count; i++)
+				response[i] = I915_READ(guc_send_reg(guc, i));
+		}
 		/* Use data encoded in status dword as return value */
 		ret = INTEL_GUC_RECV_TO_DATA(status);
 	}
-- 
2.7.4