From 69769f9a422bfc62e17399da3590c5e31ac37f24 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 15 Aug 2014 01:22:08 +0300 Subject: [PATCH] drm/i915: Preserve VGACNTR bits from the BIOS MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit My Fujistsu-Siemens Lifebook S6010 doesn't like to resume from S3 unless VGACNTR has been restore to the original value. The BIOS value in this case was 0x0124008E. Setting the "VGA disable" bit doesn't interfere with the S3 resume fortunately. Signed-off-by: Ville Syrjälä Tested-by: Thomas Richter Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/intel_display.c | 8 +++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index dbf9a26d1a89..36f3da6096e4 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1676,6 +1676,8 @@ struct drm_i915_private { */ struct workqueue_struct *dp_wq; + uint32_t bios_vgacntr; + /* Old dri1 support infrastructure, beware the dragons ya fools entering * here! */ struct i915_dri1_state dri1; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 7e20b00d56a3..0fe99bf18344 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -12727,7 +12727,11 @@ static void i915_disable_vga(struct drm_device *dev) vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); udelay(300); - I915_WRITE(vga_reg, VGA_DISP_DISABLE); + /* + * Fujitsu-Siemens Lifebook S6010 (830) has problems resuming + * from S3 without preserving (some of?) the other bits. + */ + I915_WRITE(vga_reg, dev_priv->bios_vgacntr | VGA_DISP_DISABLE); POSTING_READ(vga_reg); } @@ -12816,6 +12820,8 @@ void intel_modeset_init(struct drm_device *dev) intel_shared_dpll_init(dev); + /* save the BIOS value before clobbering it */ + dev_priv->bios_vgacntr = I915_READ(i915_vgacntrl_reg(dev)); /* Just disable it once at startup */ i915_disable_vga(dev); intel_setup_outputs(dev); -- 2.20.1