drm/i915: Demote user facing DMC firmware load failure message

This is an expected error given the lack of the firmware so emit it at
KERN_NOTICE and not KERN_ERROR. Also include the firmware URL in the
user facing message so that the user can investigate and fix the issue
on their own, and also explain the consequence in plain language.

The complete failure message, including the first line from the firmware
loader, becomes

i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1.bin failed with error -2
i915 0000:00:02.0: Failed to load DMC firmware [https://01.org/linuxgraphics/intel-linux-graphics-firmwares], disabling runtime power management.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Sunil Kamath <sunil.kamath@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Animesh Manna <animesh.manna@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452706695-13518-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 3f2850029c17d5cb23cd9bc6e24f16b0be3b68e6..5c2f9a40c81bb63992b4f3f1f987c2f76107331a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -44,6 +44,8 @@
 #define I915_CSR_SKL "i915/skl_dmc_ver1.bin"
 #define I915_CSR_BXT "i915/bxt_dmc_ver1.bin"
 
+#define FIRMWARE_URL  "https://01.org/linuxgraphics/intel-linux-graphics-firmwares"
+
 MODULE_FIRMWARE(I915_CSR_SKL);
 MODULE_FIRMWARE(I915_CSR_BXT);
 
@@ -282,7 +284,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
            csr->version < SKL_CSR_VERSION_REQUIRED) {
                DRM_INFO("Refusing to load old Skylake DMC firmware v%u.%u,"
                         " please upgrade to v%u.%u or later"
-                        " [https://01.org/linuxgraphics/intel-linux-graphics-firmwares].\n",
+                          " [" FIRMWARE_URL "].\n",
                         CSR_VERSION_MAJOR(csr->version),
                         CSR_VERSION_MINOR(csr->version),
                         CSR_VERSION_MAJOR(SKL_CSR_VERSION_REQUIRED),
@@ -400,7 +402,10 @@ out:
                         CSR_VERSION_MAJOR(csr->version),
                         CSR_VERSION_MINOR(csr->version));
        } else {
-               DRM_ERROR("Failed to load DMC firmware, disabling rpm\n");
+               dev_notice(dev_priv->dev->dev,
+                          "Failed to load DMC firmware"
+                          " [" FIRMWARE_URL "],"
+                          " disabling runtime power management.\n");
        }
 
        release_firmware(fw);