From: Jani Nikula <jani.nikula@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Egbert Eich <eich@suse.de>
Subject: Re: [PATCH 0/5] drm/i915 Avoid long delays when reading EDID on eDP
Date: Tue, 25 Nov 2014 11:08:42 +0200 [thread overview]
Message-ID: <87sih7r6jp.fsf@intel.com> (raw)
In-Reply-To: <1416849387-20984-1-git-send-email-eich@suse.de>
On Mon, 24 Nov 2014, Egbert Eich <eich@suse.de> wrote:
> For eDP in the Intel driver pps_lock()/unlock() need to be called before
> initiating an I2C/AUX channel transfer. These operations can be quite
> expensive - especially on values for HZ lower than 1000.
> It is therefore better to perfrom this locking/unlocking only once,
> ie at the beginning and at the end of the entire I2C transfer.
> The current design of drm_dp_helper.c doesn't allow this.
> This patchset modifies drm_dp_helper.c and moves the locking/unlocking
> operation to the top.
> This fixes the long delay observed in
> https://bugs.freedesktop.org/show_bug.cgi?id=86201
>
> Egbert Eich (4):
> drm/DP: Create pointer to generic DPCD access function
> drm/DP: Export drm_dp_i2c_xfer() DP helper function
> drm/DP: Export drm_dp_dpcd_access() DP helper function
These three need to be sent to dri-devel, with cc: Thierry Reding
<thierry.reding@gmail.com>.
BR,
Jani.
> drm/i915/eDP: Move pps_lock() and edp_panel_vdd_on() to top
>
> Ville Syrjälä (1):
> drm/i915: Try to avoid pps_{lock,unlock}() on DP ports
>
> drivers/gpu/drm/drm_dp_helper.c | 11 ++--
> drivers/gpu/drm/i915/intel_dp.c | 132 +++++++++++++++++++++++++++++++--------
> drivers/gpu/drm/i915/intel_drv.h | 5 ++
> include/drm/drm_dp_helper.h | 14 +++++
> 4 files changed, 133 insertions(+), 29 deletions(-)
>
> --
> 1.8.4.5
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
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next prev parent reply other threads:[~2014-11-25 9:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-24 17:16 [PATCH 0/5] drm/i915 Avoid long delays when reading EDID on eDP Egbert Eich
2014-11-24 17:16 ` [PATCH 1/5] drm/i915: Try to avoid pps_{lock, unlock}() on DP ports Egbert Eich
2014-11-24 18:28 ` Jani Nikula
2014-11-24 17:16 ` [PATCH 2/5] drm/DP: Create pointer to generic DPCD access function Egbert Eich
2014-11-24 17:16 ` [PATCH 3/5] drm/DP: Export drm_dp_i2c_xfer() DP helper function Egbert Eich
2014-11-24 17:16 ` [PATCH 4/5] drm/DP: Export drm_dp_dpcd_access() " Egbert Eich
2014-11-24 17:16 ` [PATCH 5/5] drm/i915/eDP: Move pps_lock() and edp_panel_vdd_on() to top Egbert Eich
2014-11-25 9:08 ` Jani Nikula [this message]
2014-11-25 13:13 ` [PATCH 0/5] drm/i915 Avoid long delays when reading EDID on eDP Daniel Vetter
2014-11-25 17:20 ` Egbert Eich
2014-11-26 8:57 ` Daniel Vetter
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