drm/msm/a6xx: Print GMU core firmware version at boot

Log the version for informational purposes, such as for keeping track
of possible GMU fw-related failures in crash / CI logs.

Intentionally not implemented on the if (gmu->legacy) codepath, as
these registers seem not to be used on there.

Downstream additionally warns if the firmware version is too old for
a given GPU, but we already pair the binary to a given GPU, so let's
not go there at the moment.

Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/629934/
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: quic-kdybcio

drivers/gpu/drm/msm/adreno/a6xx_gmu.c

@@ -729,6 +729,7 @@ static int a6xx_gmu_fw_load(struct a6xx_gmu *gmu)
 	const struct firmware *fw_image = adreno_gpu->fw[ADRENO_FW_GMU];
 	const struct block_header *blk;
 	u32 reg_offset;
+	u32 ver;
 
 	u32 itcm_base = 0x00000000;
 	u32 dtcm_base = 0x00040000;
@@ -775,6 +776,12 @@ static int a6xx_gmu_fw_load(struct a6xx_gmu *gmu)
 		}
 	}
 
+	ver = gmu_read(gmu, REG_A6XX_GMU_CORE_FW_VERSION);
+	DRM_INFO("Loaded GMU firmware v%u.%u.%u\n",
+		 FIELD_GET(A6XX_GMU_CORE_FW_VERSION_MAJOR__MASK, ver),
+		 FIELD_GET(A6XX_GMU_CORE_FW_VERSION_MINOR__MASK, ver),
+		 FIELD_GET(A6XX_GMU_CORE_FW_VERSION_STEP__MASK, ver));
+
 	return 0;
 }