drm/i915: Clamp linetime wm to <64usec

The linetime watermark is a 9 bit value, which gives us
a maximum linetime of just below 64 usec. If the linetime
exceeds that value we currently just discard the high bits
and program the rest into the register, which angers the
state checker.

To avoid that let's just clamp the value to the max. I believe
it should be perfectly fine to program a smaller linetime wm
than strictly required, just means the hardware may fetch data
sooner than strictly needed. We are further reassured by the
fact that with DRRS the spec tells us to program the smaller
of the two linetimes corresponding to the two refresh rates.

Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200625200003.12436-1-ville.syrjala@linux.intel.comReviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

drivers/gpu/drm/i915/display/intel_display.c

@@ -12581,12 +12581,15 @@ static u16 hsw_linetime_wm(const struct intel_crtc_state *crtc_state)
 {
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
+	int linetime_wm;
 
 	if (!crtc_state->hw.enable)
 		return 0;
 
-	return DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
-				 adjusted_mode->crtc_clock);
+	linetime_wm = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
+					adjusted_mode->crtc_clock);
+
+	return min(linetime_wm, 0x1ff);
 }
 
 static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state,
@@ -12594,12 +12597,15 @@ static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state,
 {
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
+	int linetime_wm;
 
 	if (!crtc_state->hw.enable)
 		return 0;
 
-	return DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
-				 cdclk_state->logical.cdclk);
+	linetime_wm = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
+					cdclk_state->logical.cdclk);
+
+	return min(linetime_wm, 0x1ff);
 }
 
 static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
@@ -12608,7 +12614,7 @@ static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
-	u16 linetime_wm;
+	int linetime_wm;
 
 	if (!crtc_state->hw.enable)
 		return 0;
@@ -12620,7 +12626,7 @@ static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
 	if (IS_GEN9_LP(dev_priv) && dev_priv->ipc_enabled)
 		linetime_wm /= 2;
 
-	return linetime_wm;
+	return min(linetime_wm, 0x1ff);
 }
 
 static int hsw_compute_linetime_wm(struct intel_atomic_state *state,