drm/i915/skl: Store and print the DMC firmware version we load

That can be handy later on to tell which DMC firmware version the user
has, by just looking at the dmesg.

v2: use DRM_DEBUG_DRIVER (Chris)
v3: use DRM_INFO (Marc Herbert)

Cc: Marc Herbert <marc.herbert@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> (v1)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445950025-5793-1-git-send-email-mika.kuoppala@intel.comReviewed-by: Imre Deak <imre.deak@intel.com>
Tested-by: Daniel Stone <daniels@collabora.com> # SKL
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -734,6 +734,10 @@ struct intel_uncore {
 #define for_each_fw_domain(domain__, dev_priv__, i__) \
 	for_each_fw_domain_mask(domain__, FORCEWAKE_ALL, dev_priv__, i__)
 
+#define CSR_VERSION(major, minor)	((major) << 16 | (minor))
+#define CSR_VERSION_MAJOR(version)	((version) >> 16)
+#define CSR_VERSION_MINOR(version)	((version) & 0xffff)
+
 enum csr_state {
 	FW_UNINITIALIZED = 0,
 	FW_LOADED,
@@ -744,6 +748,7 @@ struct intel_csr {
 	const char *fw_path;
 	uint32_t *dmc_payload;
 	uint32_t dmc_fw_size;
+	uint32_t version;
 	uint32_t mmio_count;
 	uint32_t mmioaddr[8];
 	uint32_t mmiodata[8];

drivers/gpu/drm/i915/intel_csr.c

@@ -321,6 +321,9 @@ static void finish_csr_load(const struct firmware *fw, void *context)
 			(css_header->header_len * 4));
 		goto out;
 	}
+
+	csr->version = css_header->version;
+
 	readcount += sizeof(struct intel_css_header);
 
 	/* Extract Package Header information*/
@@ -402,7 +405,11 @@ static void finish_csr_load(const struct firmware *fw, void *context)
 	intel_csr_load_program(dev);
 	fw_loaded = true;
 
-	DRM_DEBUG_KMS("Finished loading %s\n", dev_priv->csr.fw_path);
+	DRM_INFO("Finished loading %s (v%u.%u)\n",
+		 dev_priv->csr.fw_path,
+		 CSR_VERSION_MAJOR(csr->version),
+		 CSR_VERSION_MINOR(csr->version));
+
 out:
 	if (fw_loaded)
 		intel_runtime_pm_put(dev_priv);