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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-09-05 10:01:13 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-09-07 11:16:40 +0100 |
| commit | 52be11964869c948fbbb9ec7845f9c52b0d3dc09 (patch) | |
| tree | 122d27bd189abe10f420f8e7c298f10226ac1e44 /drivers/gpu | |
| parent | 4e5359cd053bfb7d8dabe4a63624a5726848ffbc (diff) | |
| download | linux-stable-52be11964869c948fbbb9ec7845f9c52b0d3dc09.tar.gz linux-stable-52be11964869c948fbbb9ec7845f9c52b0d3dc09.tar.bz2 linux-stable-52be11964869c948fbbb9ec7845f9c52b0d3dc09.zip | |
drm/i915: Avoid use of uninitialised values when disabling panel-fitter
We were passing garbage values into the panel-fitter control register
when disabling it on Ironlake - those values (filter modes and reserved
MBZ bits) would have then be re-used the next time panel-fitting was
enabled.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 35 |
1 files changed, 15 insertions, 20 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 1bd0c672ec90..cf8d5e5a286e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1865,9 +1865,6 @@ static void ironlake_crtc_dpms(struct drm_crtc *crtc, int mode) int fdi_tx_reg = (pipe == 0) ? FDI_TXA_CTL : FDI_TXB_CTL; int fdi_rx_reg = (pipe == 0) ? FDI_RXA_CTL : FDI_RXB_CTL; int transconf_reg = (pipe == 0) ? TRANSACONF : TRANSBCONF; - int pf_ctl_reg = (pipe == 0) ? PFA_CTL_1 : PFB_CTL_1; - int pf_win_size = (pipe == 0) ? PFA_WIN_SZ : PFB_WIN_SZ; - int pf_win_pos = (pipe == 0) ? PFA_WIN_POS : PFB_WIN_POS; int cpu_htot_reg = (pipe == 0) ? HTOTAL_A : HTOTAL_B; int cpu_hblank_reg = (pipe == 0) ? HBLANK_A : HBLANK_B; int cpu_hsync_reg = (pipe == 0) ? HSYNC_A : HSYNC_B; @@ -1936,15 +1933,19 @@ static void ironlake_crtc_dpms(struct drm_crtc *crtc, int mode) } /* Enable panel fitting for LVDS */ - if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) - || HAS_eDP || intel_pch_has_edp(crtc)) { - if (dev_priv->pch_pf_size) { - temp = I915_READ(pf_ctl_reg); - I915_WRITE(pf_ctl_reg, temp | PF_ENABLE | PF_FILTER_MED_3x3); - I915_WRITE(pf_win_pos, dev_priv->pch_pf_pos); - I915_WRITE(pf_win_size, dev_priv->pch_pf_size); - } else - I915_WRITE(pf_ctl_reg, temp & ~PF_ENABLE); + if (dev_priv->pch_pf_size && + (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) + || HAS_eDP || intel_pch_has_edp(crtc))) { + /* Force use of hard-coded filter coefficients + * as some pre-programmed values are broken, + * e.g. x201. + */ + I915_WRITE(pipe ? PFB_CTL_1 : PFA_CTL_1, + PF_ENABLE | PF_FILTER_MED_3x3); + I915_WRITE(pipe ? PFB_WIN_POS : PFA_WIN_POS, + dev_priv->pch_pf_pos); + I915_WRITE(pipe ? PFB_WIN_SZ : PFA_WIN_SZ, + dev_priv->pch_pf_size); } /* Enable CPU pipe */ @@ -2109,14 +2110,8 @@ static void ironlake_crtc_dpms(struct drm_crtc *crtc, int mode) udelay(100); /* Disable PF */ - temp = I915_READ(pf_ctl_reg); - if ((temp & PF_ENABLE) != 0) { - I915_WRITE(pf_ctl_reg, temp & ~PF_ENABLE); - I915_READ(pf_ctl_reg); - } - I915_WRITE(pf_win_size, 0); - POSTING_READ(pf_win_size); - + I915_WRITE(pipe ? PFB_CTL_1 : PFA_CTL_1, 0); + I915_WRITE(pipe ? PFB_WIN_SZ : PFA_WIN_SZ, 0); /* disable CPU FDI tx and PCH FDI rx */ temp = I915_READ(fdi_tx_reg); |