From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [PATCH v2 1/2] irqchip: sun4i: Use handle_fasteoi_irq for all interrupts Date: Mon, 17 Mar 2014 12:12:13 +0100 Message-ID: <20140317111213.GG27873@lukather> References: <1394895894-8891-1-git-send-email-hdegoede@redhat.com> <1394895894-8891-2-git-send-email-hdegoede@redhat.com> Reply-To: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="svExV93C05KqedWb" Return-path: Content-Disposition: inline In-Reply-To: <1394895894-8891-2-git-send-email-hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Post: , List-Help: , List-Archive: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Subscribe: , List-Unsubscribe: , To: Hans de Goede Cc: Thomas Gleixner , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org List-Id: devicetree@vger.kernel.org --svExV93C05KqedWb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Mar 15, 2014 at 04:04:53PM +0100, Hans de Goede wrote: > Since the sun4i irq chip does not require any action and clears the inter= rupt > when the level goes back to inactive, we don't need to mask / unmask for > non oneshot IRQs, to achieve this we make sun4i_irq_ack a nop for all irqs > except irq 0 and use handle_fasteoi_irq for all interrupts. >=20 > Now there might be a case when the device reactivates the interrupt > before the RETI. But that does not matter as we run the primary > interrupt handlers with interrupts disabled. >=20 > This also allows us to get rid of needing to use 2 irq_chip structs, this > means that the IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED will now inf= luence > all interrupts rather then just irq 0, but that does not matter as the eoi > is now a nop anyways for all interrupts but irq 0. >=20 > Signed-off-by: Hans de Goede > --- > drivers/irqchip/irq-sun4i.c | 18 ++++-------------- > 1 file changed, 4 insertions(+), 14 deletions(-) >=20 > diff --git a/drivers/irqchip/irq-sun4i.c b/drivers/irqchip/irq-sun4i.c > index a0ed1ea..6a8c88d 100644 > --- a/drivers/irqchip/irq-sun4i.c > +++ b/drivers/irqchip/irq-sun4i.c > @@ -45,6 +45,9 @@ static void sun4i_irq_ack(struct irq_data *irqd) > int reg =3D irq / 32; > u32 val; > =20 > + if (irq !=3D 0) > + return; /* Only IRQ 0 / the ENMI needs to be acked */ > + > val =3D readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg)); > writel(val | (1 << irq_off), > sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg)); > @@ -76,13 +79,6 @@ static void sun4i_irq_unmask(struct irq_data *irqd) > =20 > static struct irq_chip sun4i_irq_chip =3D { > .name =3D "sun4i_irq", > - .irq_mask =3D sun4i_irq_mask, > - .irq_unmask =3D sun4i_irq_unmask, > -}; > - > -/* IRQ 0 / the ENMI needs a late eoi call */ > -static struct irq_chip sun4i_irq_chip_enmi =3D { > - .name =3D "sun4i_irq", > .irq_eoi =3D sun4i_irq_ack, > .irq_mask =3D sun4i_irq_mask, > .irq_unmask =3D sun4i_irq_unmask, > @@ -92,13 +88,7 @@ static struct irq_chip sun4i_irq_chip_enmi =3D { > static int sun4i_irq_map(struct irq_domain *d, unsigned int virq, > irq_hw_number_t hw) > { > - if (hw =3D=3D 0) > - irq_set_chip_and_handler(virq, &sun4i_irq_chip_enmi, > - handle_fasteoi_irq); > - else > - irq_set_chip_and_handler(virq, &sun4i_irq_chip, > - handle_level_irq); > - > + irq_set_chip_and_handler(virq, &sun4i_irq_chip, handle_fasteoi_irq); > set_irq_flags(virq, IRQF_VALID | IRQF_PROBE); Oh.. And you just did. Nevermind then. Acked-by: Maxime Ripard --=20 Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com --svExV93C05KqedWb Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQIcBAEBAgAGBQJTJtiNAAoJEBx+YmzsjxAgnWUQAJVpIv1p7UlC+mMdUP5m08H3 fZ6om3gihUeYOHxVfUhX7tahH3hnRn1du3sWjrO1A+DxQ7paFzI16NfwLH37/AI2 SO6Ze5ZlfFQzeIzRObPgNVcfN0O8Jgm6Z7VW/SYS8B4TimljqIvpMv34dslxWmnZ D2QQQ5VdPPmx40cyHbG2glBHkvLd8aKcSWG2GEwRPnR6sZ+3+ct/sGsDF3Q0Mgpt muuOjgo1H6A9FPYfu3qSHBRbL/uljHhfBxaedF1v1uu7xOY99LQgBiylalmTeSvn uFA9kO44gTQOzPoJPfpl7He7PPvCrMhLuslz4+IpAhq+luk33kkSbfWkX0GceCby ZvD13Xn5YyhS5bhr4vWdLN46FytHET2g3v290s39c/Blub+yMh5W2JBzI6toxyc2 sT4lhpGR/OErHHfYPURnzt0n0clwWcyzzXWnNBMLL+7EoLIH0ExQrdiKeHJ8bRa+ zpGngCnGOFk/yRgpXrx3Afgt5FwDdrjLR4pTuaSEppdeRNZU/wmYjE2dVVUJCyJH oECbkIEBoeJQjiZhPYfdCHGGXJlJxMBViOvbZl2lHnbH1pf2d3NcxxAnWE/OVp9x VXV/eY7sbDcixXIJ+xcdRaWIQDwpURQ/zdnXqAVtlv5gRdOYgElm3jiHVDTSNE42 TtN9cW5rYa5JGaxoDHjZ =02tA -----END PGP SIGNATURE----- --svExV93C05KqedWb--