drm/i915: Add ILK support to intel_read_wm_latency
ILK has a slightly different way to read out the watermark
latency values. On ILK the LP0 latenciy values are in fact
not stored in any register, and instead we must use fixed
values.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4c40206..e5e0fb2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2372,6 +2372,13 @@
wm[1] = (sskpd >> SSKPD_WM1_SHIFT) & SSKPD_WM_MASK;
wm[2] = (sskpd >> SSKPD_WM2_SHIFT) & SSKPD_WM_MASK;
wm[3] = (sskpd >> SSKPD_WM3_SHIFT) & SSKPD_WM_MASK;
+ } else if (INTEL_INFO(dev)->gen >= 5) {
+ uint32_t mltr = I915_READ(MLTR_ILK);
+
+ /* ILK primary LP0 latency is 700 ns */
+ wm[0] = 7;
+ wm[1] = (mltr >> MLTR_WM1_SHIFT) & ILK_SRLT_MASK;
+ wm[2] = (mltr >> MLTR_WM2_SHIFT) & ILK_SRLT_MASK;
}
}