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drm/i915: don't save/restore panel fitter registers

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AFAICT i9xx_pfit_disable() on the GMCH display crtc disable path in
i9xx_crtc_disable() will always disable the panel fitter by writing 0 to
PFIT_CONTROL. The register save will always save/restore 0. Also we
completely recompue both in intel_gmch_panel_fitting so there's no way
we depend upon leftover bits.

Move the PFIT_CONTROL and PFIT_PGM_RATIOS save/restore to UMS
code. While at it, save/restore them both under the same conditions.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Make it a bit clearer that we nowhere depend upon these
bits.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2014-11-12 16:25:42 +02:00 committed by Daniel Vetter
parent 5ea13be5ba
commit f7faa1ef17
2 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/i915/i915_suspend.c
View File

@ -208,23 +208,17 @@ static void i915_save_display(struct drm_device *dev)
if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
dev_priv->regfile.saveLVDS = I915_READ(PCH_LVDS);
} else if (IS_VALLEYVIEW(dev)) {
dev_priv->regfile.savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
dev_priv->regfile.saveBLC_HIST_CTL =
I915_READ(VLV_BLC_HIST_CTL(PIPE_A));
dev_priv->regfile.saveBLC_HIST_CTL_B =
I915_READ(VLV_BLC_HIST_CTL(PIPE_B));
} else {
dev_priv->regfile.savePP_CONTROL = I915_READ(PP_CONTROL);
dev_priv->regfile.savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
dev_priv->regfile.saveBLC_HIST_CTL = I915_READ(BLC_HIST_CTL);
if (IS_MOBILE(dev) && !IS_I830(dev))
dev_priv->regfile.saveLVDS = I915_READ(LVDS);
}
if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
dev_priv->regfile.savePFIT_CONTROL = I915_READ(PFIT_CONTROL);
if (HAS_PCH_SPLIT(dev)) {
dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PCH_PP_ON_DELAYS);
dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PCH_PP_OFF_DELAYS);
@ -263,9 +257,6 @@ static void i915_restore_display(struct drm_device *dev)
else if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
I915_WRITE(LVDS, dev_priv->regfile.saveLVDS & mask);
if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
I915_WRITE(PFIT_CONTROL, dev_priv->regfile.savePFIT_CONTROL);
if (HAS_PCH_SPLIT(dev)) {
I915_WRITE(PCH_PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
I915_WRITE(PCH_PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
@ -277,7 +268,6 @@ static void i915_restore_display(struct drm_device *dev)
I915_WRITE(VLV_BLC_HIST_CTL(PIPE_B),
dev_priv->regfile.saveBLC_HIST_CTL);
} else {
I915_WRITE(PFIT_PGM_RATIOS, dev_priv->regfile.savePFIT_PGM_RATIOS);
I915_WRITE(BLC_HIST_CTL, dev_priv->regfile.saveBLC_HIST_CTL);
I915_WRITE(PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
I915_WRITE(PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);

12
drivers/gpu/drm/i915/i915_ums.c
View File

@ -270,6 +270,12 @@ void i915_save_display_reg(struct drm_device *dev)
}
/* FIXME: regfile.save TV & SDVO state */
/* Panel fitter */
if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev)) {
dev_priv->regfile.savePFIT_CONTROL = I915_READ(PFIT_CONTROL);
dev_priv->regfile.savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
}
/* Backlight */
if (INTEL_INFO(dev)->gen <= 4)
pci_read_config_byte(dev->pdev, PCI_LBPC,
@ -315,6 +321,12 @@ void i915_restore_display_reg(struct drm_device *dev)
I915_WRITE(BLC_PWM_CTL, dev_priv->regfile.saveBLC_PWM_CTL);
}
/* Panel fitter */
if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev)) {
I915_WRITE(PFIT_PGM_RATIOS, dev_priv->regfile.savePFIT_PGM_RATIOS);
I915_WRITE(PFIT_CONTROL, dev_priv->regfile.savePFIT_CONTROL);
}
/* Display port ratios (must be done before clock is set) */
if (SUPPORTS_INTEGRATED_DP(dev)) {
I915_WRITE(_PIPEA_DATA_M_G4X, dev_priv->regfile.savePIPEA_GMCH_DATA_M);