[Intel-gfx] [PATCH v3 5/5] drm/i915/wm: remove ILK+ nop funcs fallback

[Jani Nikula <jani.nikula@intel.com>]

Disabling ILK+ watermarks on failure to read the watermark levels dates
back to 2010 and commit 7f8a85698f5c ("drm/i915: Add the support of
memory self-refresh on Ironlake"), with no explanations, and it's been
copied and modified from that ever since. Finally drop it.

If the value are actually zero, the ilk_compute_*_wm() functions should
handle it gracefully.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/display/i9xx_wm.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/i9xx_wm.c b/drivers/gpu/drm/i915/display/i9xx_wm.c
index 50cdfe11192e..3d4687efe4dd 100644
--- a/drivers/gpu/drm/i915/display/i9xx_wm.c
+++ b/drivers/gpu/drm/i915/display/i9xx_wm.c
@@ -4007,19 +4007,7 @@ void i9xx_wm_init(struct drm_i915_private *dev_priv)
 	/* For FIFO watermark updates */
 	if (HAS_PCH_SPLIT(dev_priv)) {
 		ilk_setup_wm_latency(dev_priv);
-
-		if ((DISPLAY_VER(dev_priv) == 5 && dev_priv->display.wm.pri_latency[1] &&
-		     dev_priv->display.wm.spr_latency[1] && dev_priv->display.wm.cur_latency[1]) ||
-		    (DISPLAY_VER(dev_priv) != 5 && dev_priv->display.wm.pri_latency[0] &&
-		     dev_priv->display.wm.spr_latency[0] && dev_priv->display.wm.cur_latency[0])) {
-			dev_priv->display.funcs.wm = &ilk_wm_funcs;
-		} else {
-			ilk_init_lp_watermarks(dev_priv);
-			drm_dbg_kms(&dev_priv->drm,
-				    "Failed to read display plane latency. "
-				    "Disable CxSR\n");
-			dev_priv->display.funcs.wm = &nop_funcs;
-		}
+		dev_priv->display.funcs.wm = &ilk_wm_funcs;
 	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		vlv_setup_wm_latency(dev_priv);
 		dev_priv->display.funcs.wm = &vlv_wm_funcs;
-- 
2.34.1