drm/i915/fbc: Introduce g4x_dpfc_ctl_limit()

Exctract the limit->register value conversion into a common
helper.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610183237.3920-7-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 1c220cea89779cb463b91e06c85f9c50aee41180..31ac1163f55b7b6d39ecbc107f15a8cdf3090b07 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -148,16 +148,35 @@ static bool i8xx_fbc_is_active(struct drm_i915_private *dev_priv)
        return intel_de_read(dev_priv, FBC_CONTROL) & FBC_CTL_EN;
 }
 
+static u32 g4x_dpfc_ctl_limit(struct drm_i915_private *i915)
+{
+       const struct intel_fbc_reg_params *params = &i915->fbc.params;
+       int limit = i915->fbc.limit;
+
+       if (params->fb.format->cpp[0] == 2)
+               limit <<= 1;
+
+       switch (limit) {
+       default:
+               MISSING_CASE(limit);
+               fallthrough;
+       case 1:
+               return DPFC_CTL_LIMIT_1X;
+       case 2:
+               return DPFC_CTL_LIMIT_2X;
+       case 4:
+               return DPFC_CTL_LIMIT_4X;
+       }
+}
+
 static void g4x_fbc_activate(struct drm_i915_private *dev_priv)
 {
        struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
        u32 dpfc_ctl;
 
        dpfc_ctl = DPFC_CTL_PLANE(params->crtc.i9xx_plane) | DPFC_SR_EN;
-       if (params->fb.format->cpp[0] == 2)
-               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
-       else
-               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
+
+       dpfc_ctl |= g4x_dpfc_ctl_limit(dev_priv);
 
        if (params->fence_id >= 0) {
                dpfc_ctl |= DPFC_CTL_FENCE_EN | params->fence_id;
@@ -235,23 +254,10 @@ static void ilk_fbc_activate(struct drm_i915_private *dev_priv)
 {
        struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
        u32 dpfc_ctl;
-       int limit = dev_priv->fbc.limit;
 
        dpfc_ctl = DPFC_CTL_PLANE(params->crtc.i9xx_plane);
-       if (params->fb.format->cpp[0] == 2)
-               limit <<= 1;
 
-       switch (limit) {
-       case 4:
-               dpfc_ctl |= DPFC_CTL_LIMIT_4X;
-               break;
-       case 2:
-               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
-               break;
-       case 1:
-               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
-               break;
-       }
+       dpfc_ctl |= g4x_dpfc_ctl_limit(dev_priv);
 
        if (params->fence_id >= 0) {
                dpfc_ctl |= DPFC_CTL_FENCE_EN;
@@ -299,7 +305,6 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
 {
        struct intel_fbc_reg_params *params = &dev_priv->fbc.params;
        u32 dpfc_ctl;
-       int limit = dev_priv->fbc.limit;
 
        /* Display WA #0529: skl, kbl, bxt. */
        if (DISPLAY_VER(dev_priv) == 9) {
@@ -317,20 +322,7 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
        if (IS_IVYBRIDGE(dev_priv))
                dpfc_ctl |= IVB_DPFC_CTL_PLANE(params->crtc.i9xx_plane);
 
-       if (params->fb.format->cpp[0] == 2)
-               limit <<= 1;
-
-       switch (limit) {
-       case 4:
-               dpfc_ctl |= DPFC_CTL_LIMIT_4X;
-               break;
-       case 2:
-               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
-               break;
-       case 1:
-               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
-               break;
-       }
+       dpfc_ctl |= g4x_dpfc_ctl_limit(dev_priv);
 
        if (params->fence_id >= 0) {
                dpfc_ctl |= IVB_DPFC_CTL_FENCE_EN;