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drm/i915: add hotplug activation period to hotplug update mask 

commit 0706f17c30
Author: Egbert Eich <eich@suse.de>
Date:   Wed Sep 23 16:15:27 2015 +0200

    drm/i915: Avoid race of intel_crt_detect_hotplug() with HPD interrupt, v2

added a check with WARN to ensure only bits within the mask are
enabled. Turns out that doesn't hold for G4X, which spits out:

[    2.641439] ------------[ cut here ]------------
[    2.641444] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/i915/i915_irq.c:182 i915_hotplug_interrupt_update_locked+0x45/0x83()
[    2.641446] WARN_ON(bits & ~mask)
etc.

Add CRT_HOTPLUG_ACTIVATION_PERIOD_64 to the mask to fix the warning.

Reported-and-tested-by: Oleksij Rempel <linux@rempel-privat.de>
References: https://bugzilla.kernel.org/show_bug.cgi?id=104991
Fixes: 0706f17c30 ("drm/i915: Avoid race of intel_crt_detect_hotplug() with HPD interrupt, v2")
Cc: Egbert Eich <eich@suse.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1445437363-3030-1-git-send-email-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2015-10-21 17:22:43 +03:00
parent 606bb5e0b2
commit f9e3dc786a
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/i915_irq.c
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@ -4236,9 +4236,10 @@ static void i915_hpd_irq_setup(struct drm_device *dev)
/* Ignore TV since it's buggy */
i915_hotplug_interrupt_update_locked(dev_priv,
(HOTPLUG_INT_EN_MASK
| CRT_HOTPLUG_VOLTAGE_COMPARE_MASK),
hotplug_en);
HOTPLUG_INT_EN_MASK |
CRT_HOTPLUG_VOLTAGE_COMPARE_MASK |
CRT_HOTPLUG_ACTIVATION_PERIOD_64,
hotplug_en);
}
static irqreturn_t i965_irq_handler(int irq, void *arg)