Fwd: [PATCH 0/5] drm/dp: i2c-over-aux short write support

[Alex Deucher]

fwd to the list.


---------- Forwarded message ----------
From: Alex Deucher <alexdeucher at gmail.com>
Date: Mon, Mar 16, 2015 at 9:49 AM
Subject: Re: [PATCH 0/5] drm/dp: i2c-over-aux short write support
To: Ville Syrjälä <ville.syrjala at linux.intel.com>


On Fri, Mar 13, 2015 at 12:13 PM,  <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> This series tries to implement support for short i2c-over-aux writes.
>
> I did notice that my monitor (HP ZR24w) does support DDC/CI so I was
> able to do some writes, but I only saw native defers instead of i2c
> defers/short acks. So I've not actually been able to test this.
>
> Another complication with DDC/CI seems to be that the monitor doesn't
> seem to like the default 100kHz bus speed. I had to drop it to 10kHz
> to make it reliable (my dongle supports bus speed control fortunately).
> Currently we have no standard way to configure the bus speed AFAICS,
> so at least with this monitor DDC/CI is a bit useless.
>
> I tried to fix up radeon and tegra too. gma500 I left alone since it's
> not using dp i2c helper.
>
> Ville Syrjälä (5):
>   drm/dp: s/I2C_STATUS/I2C_WRITE_STATUS_UPDATE/
>   drm/i915: Handle DP_AUX_I2C_WRITE_STATUS_UPDATE
>   drm/radeon: Handle DP_AUX_I2C_WRITE_STATUS_UPDATE
>   drm/tegra: Handle I2C_WRITE_STATUS_UPDATE for address only writes
>   drm/dp: Use I2C_WRITE_STATUS_UPDATE to drain partial I2C_WRITE
>     requests

Patches 1, 3, 5 are:
Acked-by: Alex Deucher <alexander.deucher at amd.com>


>
>  drivers/gpu/drm/drm_dp_helper.c      | 42 ++++++++++++++++++++++++++++++++----
>  drivers/gpu/drm/i915/intel_dp.c      |  1 +
>  drivers/gpu/drm/radeon/atombios_dp.c |  1 +
>  drivers/gpu/drm/tegra/dpaux.c        |  3 ++-
>  include/drm/drm_dp_helper.h          |  2 +-
>  5 files changed, 43 insertions(+), 6 deletions(-)
>
> --
> 2.0.5
>
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