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drm/i915/fbc: Handle 16bpp compression limit better

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The limit++ for the 16bpp case is nonsense since the
compression limit is always supposed to be power of two.
Replace it with <<=1.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610183237.3920-6-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
This commit is contained in:
Ville Syrjälä
2021-06-10 21:32:33 +03:00
parent 337e54f77c
commit d502f6c438
1 changed files with 2 additions and 4 deletions
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6
drivers/gpu/drm/i915/display/intel_fbc.c
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@@ -239,11 +239,10 @@ static void ilk_fbc_activate(struct drm_i915_private *dev_priv)
dpfc_ctl = DPFC_CTL_PLANE(params->crtc.i9xx_plane);
if (params->fb.format->cpp[0] == 2)
limit++;
limit <<= 1;
switch (limit) {
case 4:
case 3:
dpfc_ctl |= DPFC_CTL_LIMIT_4X;
break;
case 2:
@@ -319,11 +318,10 @@ static void gen7_fbc_activate(struct drm_i915_private *dev_priv)
dpfc_ctl |= IVB_DPFC_CTL_PLANE(params->crtc.i9xx_plane);
if (params->fb.format->cpp[0] == 2)
limit++;
limit <<= 1;
switch (limit) {
case 4:
case 3:
dpfc_ctl |= DPFC_CTL_LIMIT_4X;
break;
case 2: