[PATCH 2/2] drm/i915/hsw: use intel_compute_linetime_wm function for linetime wm

[Mahesh Kumar]

linetime wm is time taken to fill a single display line with given clock
rate, multiplied by 8.
This patch reuses the common code of hsw_compute_linetime_wm &
skl_compute_linetime_wm.

Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 drivers/gpu/drm/i915/intel_pm.c  | 23 ++++++++++++++---------
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 83dd40905821..ea2d29e68bfe 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1877,6 +1877,7 @@ bool ilk_disable_lp_wm(struct drm_device *dev);
 int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6);
 int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
 				  struct intel_crtc_state *cstate);
+uint32_t intel_compute_linetime_wm(const struct intel_crtc_state *cstate);
 static inline int intel_enable_rc6(void)
 {
 	return i915.enable_rc6;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a131ef98b9ae..d2ddbe8b2fe6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2746,8 +2746,7 @@ hsw_compute_linetime_wm(const struct intel_crtc_state *cstate)
 	/* The WM are computed with base on how long it takes to fill a single
 	 * row at the given clock rate, multiplied by 8.
 	 * */
-	linetime = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
-				     adjusted_mode->crtc_clock);
+	linetime = intel_compute_linetime_wm(cstate);
 	ips_linetime = DIV_ROUND_CLOSEST(adjusted_mode->crtc_htotal * 1000 * 8,
 					 intel_state->cdclk.logical.cdclk);
 
@@ -4382,7 +4381,7 @@ static uint_fixed_16_16_t skl_wm_method2(uint32_t pixel_rate,
 }
 
 static uint_fixed_16_16_t
-intel_get_linetime_us(struct intel_crtc_state *cstate)
+intel_get_linetime_us(const struct intel_crtc_state *cstate)
 {
 	uint32_t pixel_rate;
 	uint32_t crtc_htotal;
@@ -4603,20 +4602,26 @@ skl_compute_wm_levels(const struct drm_i915_private *dev_priv,
 	return 0;
 }
 
-static uint32_t
-skl_compute_linetime_wm(struct intel_crtc_state *cstate)
+uint32_t intel_compute_linetime_wm(const struct intel_crtc_state *cstate)
 {
-	struct drm_atomic_state *state = cstate->base.state;
-	struct drm_i915_private *dev_priv = to_i915(state->dev);
 	uint_fixed_16_16_t linetime_us;
-	uint32_t linetime_wm;
 
 	linetime_us = intel_get_linetime_us(cstate);
 
 	if (is_fixed16_zero(linetime_us))
 		return 0;
 
-	linetime_wm = fixed16_to_u32_round_up(mul_u32_fixed16(8, linetime_us));
+	return fixed16_to_u32_round_up(mul_u32_fixed16(8, linetime_us));
+}
+
+static uint32_t
+skl_compute_linetime_wm(struct intel_crtc_state *cstate)
+{
+	struct drm_atomic_state *state = cstate->base.state;
+	struct drm_i915_private *dev_priv = to_i915(state->dev);
+	uint32_t linetime_wm;
+
+	linetime_wm = intel_compute_linetime_wm(cstate);
 
 	/* Display WA #1135: bxt. */
 	if (IS_BROXTON(dev_priv) && dev_priv->ipc_enabled)
-- 
2.11.0