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From: =?ISO-8859-1?Q?Jean-S=E9bastien_P=E9dron?= <dumbbell@FreeBSD.org>
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To: Konstantin Belousov <kostikbel@gmail.com>
Subject: Re: svn commit: r249041 - in head/sys/dev/drm2: . i915
References: <201304030827.r338RZih051806@svn.freebsd.org>
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On 07.04.2013 21:05, Konstantin Belousov wrote:
> I suspect that the issue is with the drm2/i915/intel_dp.c.
> You might try to use shift to 7 instead of 8 for address in the
> intel_dp_aux_native_read/write, but I am not sure.

Based on your remark, I proposed the following patch to Olivier:
http://people.freebsd.org/~dumbbell/radeonkms/drm-i915-intel_iic.b.patch

And it worked for him!

If I understand correctly, this "aux channel" emulates a I2C bus. The
patch right-shifts back the slave address (in drm_dp_iic_helper.c). This
address is then used in intel_dp_i2c_aux_ch() (intel_dp.c).

If you agree, I can commit it.

--=20
Jean-S=E9bastien P=E9dron


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