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drm/i915: disable VGA plane reliably

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This does VGA disable like DDX driver. SR01 bit 5 should be set
before VGA plane disable through control register, otherwise we
might get random crash and lockups.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zhenyu Wang 2009-07-24 01:00:28 +08:00 committed by Eric Anholt
parent cdaa052b05
commit 24f119c769
1 changed files with 25 additions and 3 deletions
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28
drivers/gpu/drm/i915/intel_display.c
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@ -998,6 +998,29 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
return 0;
}
/* Disable the VGA plane that we never use */
static void i915_disable_vga (struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u8 sr1;
u32 vga_reg;
if (IS_IGDNG(dev))
vga_reg = CPU_VGACNTRL;
else
vga_reg = VGACNTRL;
if (I915_READ(vga_reg) & VGA_DISP_DISABLE)
return;
I915_WRITE8(VGA_SR_INDEX, 1);
sr1 = I915_READ8(VGA_SR_DATA);
I915_WRITE8(VGA_SR_DATA, sr1 | (1 << 5));
udelay(100);
I915_WRITE(vga_reg, VGA_DISP_DISABLE);
}
static void igdng_crtc_dpms(struct drm_crtc *crtc, int mode)
{
struct drm_device *dev = crtc->dev;
@ -1200,8 +1223,7 @@ static void igdng_crtc_dpms(struct drm_crtc *crtc, int mode)
case DRM_MODE_DPMS_OFF:
DRM_DEBUG("crtc %d dpms off\n", pipe);
/* Disable the VGA plane that we never use */
I915_WRITE(CPU_VGACNTRL, VGA_DISP_DISABLE);
i915_disable_vga(dev);
/* Disable display plane */
temp = I915_READ(dspcntr_reg);
@ -1342,7 +1364,7 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
//intel_crtc_dpms_video(crtc, FALSE); TODO
/* Disable the VGA plane that we never use */
I915_WRITE(VGACNTRL, VGA_DISP_DISABLE);
i915_disable_vga(dev);
/* Disable display plane */
temp = I915_READ(dspcntr_reg);