From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Matteo Iervasi <matteoiervasi@gmail.com>,
Jani Nikula <jani.nikula@intel.com>,
Albert Astals Cid <aacid@kde.org>,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
Emanuele Panigati <ilpanich@gmail.com>
Subject: Re: [Intel-gfx] [PATCH 1/2] drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure
Date: Mon, 11 Jan 2021 20:28:45 +0200 [thread overview]
Message-ID: <X/yY3Tvk8gq+Eg8W@intel.com> (raw)
In-Reply-To: <20210107182026.24848-1-ville.syrjala@linux.intel.com>
On Thu, Jan 07, 2021 at 08:20:25PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Some new eDP panels don't like to operate at the max parameters, and
> instead we need to go for an optimal confiugration. That unfortunately
> doesn't work with older eDP panels which are generally only guaranteed
> to work at the max parameters.
>
> To solve these two conflicting requirements let's start with the optimal
> setup, and if that fails we start again with the max parameters. The
> downside is probably an extra modeset when we switch strategies but
> I don't see a good way to avoid that.
>
> For a bit of history we first tried to go for the fast+narrow in
> commit 7769db588384 ("drm/i915/dp: optimize eDP 1.4+ link config
> fast and narrow"). but that had to be reverted due to regression
> on older panels in commit f11cb1c19ad0 ("drm/i915/dp: revert back
> to max link rate and lane count on eDP"). So now we try to get
> the best of both worlds by using both strategies.
Pushed. Fingers crossed for no regressions...
--
Ville Syrjälä
Intel
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next prev parent reply other threads:[~2021-01-11 18:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 18:20 [Intel-gfx] [PATCH 1/2] drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure Ville Syrjala
2021-01-07 18:20 ` [Intel-gfx] [PATCH 2/2] drm: Refactor intel_dp_compute_link_config_*() Ville Syrjala
2021-01-07 19:38 ` [Intel-gfx] ✗ Fi.CI.SPARSE: warning for series starting with [1/2] drm/i915: Try to use fast+narrow link on eDP again and fall back to the old max strategy on failure Patchwork
2021-01-07 20:06 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-01-08 1:25 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-01-11 18:28 ` Ville Syrjälä [this message]
2021-05-10 8:07 ` [Intel-gfx] [PATCH 1/2] " Emanuele Panigati
2021-05-10 18:06 ` Albert Astals Cid
2021-05-11 3:29 ` Kai-Heng Feng
2021-05-11 12:57 ` Jani Nikula
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