From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: intel-gfx@lists.freedesktop.org
Subject: Enable GSE interrupt on Broadwell and later?
Date: Tue, 1 Dec 2015 21:53:50 +0100 (CET) [thread overview]
Message-ID: <201512012053.tB1KroT3014721@glazunov.sibelius.xs4all.nl> (raw)
I just committed the following cange to the OpenBSD inteldrm(4)
driver, which currently is mostly a port of the Linux 3.14 codebase.
This enables the GSE interrupt on Broadwell. Without this interrupt,
the ASLE backlight brightness mechanism doesn't work. I've verified
that this fixed the ACPI _BCM/_BCQ-based brightness mechanism on a
MacBookPro12,1 and a 3rd gen Lenovo X1 Carbon. And as far as I can
tell the current Linux code still doesn't enable the GSE interrupt.
So people over there might want to consider a diff like the one below.
Cheers.
Mark
Index: i915_irq.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_irq.c,v
retrieving revision 1.29
diff -u -p -r1.29 i915_irq.c
--- i915_irq.c 23 Sep 2015 23:12:12 -0000 1.29
+++ i915_irq.c 1 Dec 2015 20:43:05 -0000
@@ -3019,6 +3019,10 @@ static void gen8_de_irq_postinstall(stru
I915_WRITE(GEN8_DE_PORT_IMR, ~GEN8_AUX_CHANNEL_A);
I915_WRITE(GEN8_DE_PORT_IER, GEN8_AUX_CHANNEL_A);
POSTING_READ(GEN8_DE_PORT_IER);
+
+ I915_WRITE(GEN8_DE_MISC_IMR, ~GEN8_DE_MISC_GSE);
+ I915_WRITE(GEN8_DE_MISC_IER, GEN8_DE_MISC_GSE);
+ POSTING_READ(GEN8_DE_MISC_IER);
}
static int gen8_irq_postinstall(struct drm_device *dev)
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
next reply other threads:[~2015-12-01 21:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 20:53 Mark Kettenis [this message]
2015-12-01 21:46 ` Enable GSE interrupt on Broadwell and later? Ville Syrjälä
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=201512012053.tB1KroT3014721@glazunov.sibelius.xs4all.nl \
--to=mark.kettenis@xs4all.nl \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.