On Thu, Jun 20, 2013 at 12:17:25PM +0200, Laurent Pinchart wrote: > Hi Thierry, > > On Thursday 20 June 2013 12:10:47 Thierry Reding wrote: > > On Wed, Jun 19, 2013 at 02:00:45PM +0200, Laurent Pinchart wrote: > > > Signed-off-by: Laurent Pinchart > > > <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> > > > --- > > > > > > Documentation/DocBook/drm.tmpl | 14 ++++++++------ > > > 1 file changed, 8 insertions(+), 6 deletions(-) > > > > > > diff --git a/Documentation/DocBook/drm.tmpl > > > b/Documentation/DocBook/drm.tmpl index f9df3b8..738b727 100644 > > > --- a/Documentation/DocBook/drm.tmpl > > > +++ b/Documentation/DocBook/drm.tmpl > > > @@ -186,11 +186,12 @@ > > > > > > <varlistentry> > > > > > > <term>DRIVER_HAVE_IRQ</term><term>DRIVER_IRQ_SHARED</term> > > > <listitem><para> > > > > > > - DRIVER_HAVE_IRQ indicates whether the driver has an IRQ > > > handler. The - DRM core will automatically register an > > > interrupt handler when the - flag is set. DRIVER_IRQ_SHARED > > > indicates whether the device & - handler support shared > > > IRQs (note that this is required of PCI - drivers). > > > + DRIVER_HAVE_IRQ indicates whether the driver has an IRQ > > > handler + managed by the DRM Core. The core will support > > > simple IRQ handler + installation when the flag is set. The > > > installation process is + described in <xref > > > linkend="drm-irq-registration"/>.</para> + > > > <para>DRIVER_IRQ_SHARED indicates whether the device & handler + > > > support shared IRQs (note that this is required of PCI drivers).> > > > </para></listitem> > > > > > > </varlistentry> > > > <varlistentry> > > > > > > @@ -344,7 +345,8 @@ char *date;</synopsis> > > > > > > The DRM core tries to facilitate IRQ handler registration and > > > unregistration by providing > > > <function>drm_irq_install</function> and > > > <function>drm_irq_uninstall</function> functions. Those > > > functions only > > > > > > - support a single interrupt per device. > > > + support a single interrupt per device, devices that use more > > > than one + IRQs need to be handled manually. > > > > Perhaps this should mention that if you handle IRQ installation manually > > you also need to manually set drm->irq_enabled = 1, as otherwise things > > like DRM_IOCTL_WAIT_VBLANK won't work properly. > > That's only needed if DRIVER_HAVE_IRQ is set, otherwise the drm_wait_vblank() > function skips the irq_enabled check. Not quite. There's another check for dev->irq_enabled in the DRM_WAIT_ON() so it'll never actually block. Arguably this could be solved by making the DRM_WAIT_ON() condition drop the !dev->irq_enabled in case DRIVER_HAVE_IRQ isn't set. I'll see if I can find the time to come up with a patch. Thierry
Attachment:
pgprevZJ32mh9.pgp
Description: PGP signature
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
