[Intel-gfx] [PATCH v4 04/12] drm/i915: Warn when cdclk for the platforms is not known

[Mika Kahola]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Print a warning if we fall through the .get_display_clock_speed() function
pointer setup. We end up assuming a 133MHz cdclk which should mean that
at least we avoid any 0 deivisions and whatnot. But this could at least
help remind people that they have to provide this function for new platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

v2: Rebased to the latest
v3: Rebased to the latest

Reviewed-by: Mika Kahola <mika.kahola at intel.com>

Author:    Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 86c9140..de65737 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14398,9 +14398,11 @@ static void intel_init_display(struct drm_device *dev)
 	else if (IS_I85X(dev))
 		dev_priv->display.get_display_clock_speed =
 			i85x_get_display_clock_speed;
-	else /* 830 */
+	else { /* 830 */
+		WARN(!IS_I830(dev), "Unknown platform. Assuming 133 MHz CDCLK\n");
 		dev_priv->display.get_display_clock_speed =
 			i830_get_display_clock_speed;
+	}
 
 	if (IS_GEN5(dev)) {
 		dev_priv->display.fdi_link_train = ironlake_fdi_link_train;
-- 
1.9.1