linux-kernel - Re: [PATCH 1/4] drm/i915: add support for vga

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Message-ID: <CALkWK0nuXpDGZYEcR2_2zYY=7X_Ot3FXVmZLvQiCmbZQaSM-+w@mail.gmail.com>
Date:	Tue, 7 Jan 2014 16:23:44 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andreas Heider <andreas@...tr.de>,
	Seth Forshee <seth.forshee@...onical.com>
Subject: Re: [PATCH 1/4] drm/i915: add support for vga_switcheroo reprobe

Hi Chris,

Chris Wilson wrote:
>> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
>> index 5c64842..336a835b 100644
>> --- a/drivers/gpu/drm/i915/i915_dma.c
>> +++ b/drivers/gpu/drm/i915/i915_dma.c
>> @@ -1265,6 +1265,12 @@ static void i915_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_
>>       }
>>  }
>>
>> +static void i915_switcheroo_reprobe(struct pci_dev *pdev)
>> +{
>> +     struct drm_device *dev = pci_get_drvdata(pdev);
>> +     intel_fbdev_output_poll_changed(dev);
>> +}
>
> switcheroo should be sending a hotplug notification, which should
> trigger both this kernel listener and userspace.

If I understand correctly, switcheroo will send a hotplug notification
when LVDS is connected to the i915 device, and trigger this reprobe
function(), which in a later patch calls get-edid. Right?
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