On Wed, Aug 29, 2012 at 02:08:42PM +0300, Jani Nikula wrote: > Avoid constant wakeups caused by noisy irq lines when we don't even care > about the irq. This should be particularly useful for i945g/gm where the > hotplug has been disabled: > > commit 768b107e4b3be0acf6f58e914afe4f337c00932b > Author: Daniel Vetter <daniel.vetter at ffwll.ch> > Date: Fri May 4 11:29:56 2012 +0200 > > drm/i915: disable sdvo hotplug on i945g/gm > > v2: While at it, remove the bogus hotplug_active read, and do not mask > hotplug_active[0] before checking whether the irq is needed, per discussion > with Daniel on IRC. > > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=38442 > Signed-off-by: Jani Nikula <jani.nikula at intel.com> > > --- > > N.B. This really needs a Tested-by from the bug reporter. Picked up for -fixes (with the tested-by + cc: stable added), thanks for the patch. -Daniel > --- > drivers/gpu/drm/i915/intel_sdvo.c | 15 ++++++--------- > 1 file changed, 6 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c > index d81bb0b..123afd3 100644 > --- a/drivers/gpu/drm/i915/intel_sdvo.c > +++ b/drivers/gpu/drm/i915/intel_sdvo.c > @@ -2573,7 +2573,6 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob) > hotplug_mask = intel_sdvo->is_sdvob ? > SDVOB_HOTPLUG_INT_STATUS_I915 : SDVOC_HOTPLUG_INT_STATUS_I915; > } > - dev_priv->hotplug_supported_mask |= hotplug_mask; > > drm_encoder_helper_add(&intel_encoder->base, &intel_sdvo_helper_funcs); > > @@ -2581,14 +2580,6 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob) > if (!intel_sdvo_get_capabilities(intel_sdvo, &intel_sdvo->caps)) > goto err; > > - /* Set up hotplug command - note paranoia about contents of reply. > - * We assume that the hardware is in a sane state, and only touch > - * the bits we think we understand. > - */ > - intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_ACTIVE_HOT_PLUG, > - &intel_sdvo->hotplug_active, 2); > - intel_sdvo->hotplug_active[0] &= ~0x3; > - > if (intel_sdvo_output_setup(intel_sdvo, > intel_sdvo->caps.output_flags) != true) { > DRM_DEBUG_KMS("SDVO output failed to setup on %s\n", > @@ -2596,6 +2587,12 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob) > goto err; > } > > + /* Only enable the hotplug irq if we need it, to work around noisy > + * hotplug lines. > + */ > + if (intel_sdvo->hotplug_active[0]) > + dev_priv->hotplug_supported_mask |= hotplug_mask; > + > intel_sdvo_select_ddc_bus(dev_priv, intel_sdvo, sdvo_reg); > > /* Set the input timing to the screen. Assume always input 0. */ > -- > 1.7.9.5 > -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
