From: Icenowy Zheng <icenowy@aosc.io>
To: linux-arm-kernel@lists.infradead.org,
Vasily Khoruzhick <anarsoul@gmail.com>,
Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree <devicetree@vger.kernel.org>,
Archit Taneja <architt@codeaurora.org>,
David Airlie <airlied@linux.ie>, Chen-Yu Tsai <wens@csie.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Andrzej Hajda <a.hajda@samsung.com>,
linux-sunxi <linux-sunxi@googlegroups.com>,
Rob Herring <robh+dt@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Daniel Vetter <daniel@ffwll.ch>,
Sean Paul <seanpaul@chromium.org>,
arm-linux <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH RESEND v2 06/12] drm/sun4i: rgb: Add 1% tolerance to dclk frequency check when bridge is connected
Date: Tue, 05 Feb 2019 00:28:21 +0800 [thread overview]
Message-ID: <0F6CBEA4-6DB6-40F1-A2FD-65101AF64F1F@aosc.io> (raw)
In-Reply-To: <CA+E=qVfTfJ9E29gz83tdVGx5_KGWSQVJOAxKTzC+-n7=gdj0cA@mail.gmail.com>
于 2019年2月5日 GMT+08:00 上午12:26:43, Vasily Khoruzhick <anarsoul@gmail.com> 写到:
>On Mon, Feb 4, 2019 at 6:20 AM Maxime Ripard
><maxime.ripard@bootlin.com> wrote:
>>
>> Hi,
>>
>> On Sun, Feb 03, 2019 at 10:54:55AM -0800, Vasily Khoruzhick wrote:
>> > Clock rate check that was added in commit bb43d40d7c83 ("drm/sun4i:
>rgb:
>> > Validate the clock rate") prevents some panel and bridges from
>working with
>> > sun4i driver.
>> >
>> > Unfortunately, dotclock frequency for some modes are not achievable
>on
>> > sunxi hardware, and there's a slight deviation in rate returned by
>> > clk_round_rate(), so they fail this check.
>> >
>> > Experiments show that panels and bridges work fine with this slight
>> > deviation, e.g. Pinebook that uses ANX6345 bridge with 768p eDP
>panel
>> > requests 73 MHz, gets 72.296MHz instead (0.96% difference) and
>works just
>> > fine.
>> >
>> > This patch adds a 1% tolerence to the dot clock check when bridge
>is
>> > connected.
>> >
>> > Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
>>
>> I'm not sure we want to make exceptions for all the hardware
>> combination we face, but we should go for something more generic (and
>> easier to maintain instead).
>>
>> IIRC, from the previous discussion, HDMI had a tolerancy requirement
>> in the standard. Do you know if there's such a thing for eDP? That
>> would solve the issue for all the eDP displays at once.
>
>I don't have access to eDP standard - vesa.org says it's available to
>members only.
Try out to grab an old version?
I remember 1.0 is open.
>
>> Maxime
>>
>> --
>> Maxime Ripard, Bootlin
>> Embedded Linux and Kernel engineering
>> https://bootlin.com
>
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next prev parent reply other threads:[~2019-02-04 16:30 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-03 18:54 [PATCH RESEND v2 00/12] Analogix ANX6345 RGB-(e)DP bridge support Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 01/12] drm/bridge: move ANA78xx driver to analogix subdirectory Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 02/12] drm/bridge: split some definitions of ANX78xx to dedicated headers Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 03/12] drm/bridge: extract some Analogix I2C DP common code Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 04/12] dt-bindings: Add ANX6345 DP/eDP transmitter binding Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 05/12] drm/bridge: Add Analogix anx6345 support Vasily Khoruzhick
2019-02-05 13:19 ` Torsten Duwe
2019-02-03 18:54 ` [PATCH RESEND v2 06/12] drm/sun4i: rgb: Add 1% tolerance to dclk frequency check when bridge is connected Vasily Khoruzhick
2019-02-04 14:20 ` Maxime Ripard
2019-02-04 16:26 ` Vasily Khoruzhick
2019-02-04 16:28 ` Icenowy Zheng [this message]
2019-02-04 18:50 ` [linux-sunxi] " Vasily Khoruzhick
2019-02-05 15:41 ` Maxime Ripard
2019-02-05 17:49 ` Vasily Khoruzhick
2019-02-06 9:16 ` Maxime Ripard
2019-02-06 11:42 ` Thierry Reding
2019-02-03 18:54 ` [PATCH RESEND v2 07/12] drm/panel: simple: don't fail if we don't have panel desc Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 08/12] dt-bindings: add binding for generic eDP panel Vasily Khoruzhick
2019-02-04 7:43 ` Thierry Reding
2019-02-04 8:13 ` Vasily Khoruzhick
2019-02-04 8:23 ` Thierry Reding
2019-02-04 9:40 ` Daniel Vetter
2019-02-04 11:22 ` Thierry Reding
2019-02-04 15:59 ` Daniel Vetter
2019-02-04 16:22 ` Thierry Reding
2019-02-05 8:57 ` Daniel Vetter
2019-02-05 10:24 ` Thierry Reding
2019-02-05 16:36 ` Daniel Vetter
2019-02-14 19:51 ` Vasily Khoruzhick
2019-02-14 20:05 ` Vasily Khoruzhick
2019-02-14 20:38 ` Rob Herring
2019-02-14 20:54 ` Vasily Khoruzhick
2019-02-04 16:11 ` Vasily Khoruzhick
2019-02-04 16:27 ` Thierry Reding
2019-02-04 16:39 ` Rob Herring
2019-02-04 17:02 ` [linux-sunxi] " Vasily Khoruzhick
2019-02-04 16:27 ` Rob Herring
2019-02-04 16:56 ` Thierry Reding
2019-02-04 17:07 ` Vasily Khoruzhick
2019-02-04 20:23 ` Rob Herring
2019-02-04 20:26 ` Vasily Khoruzhick
2019-02-04 20:34 ` Rob Herring
2019-02-03 18:54 ` [PATCH RESEND v2 09/12] drm/panel: simple: add " Vasily Khoruzhick
2019-02-03 18:54 ` [PATCH RESEND v2 10/12] arm64: allwinner: a64: add pinmux for RGB666 LCD Vasily Khoruzhick
2019-02-03 18:55 ` [PATCH RESEND v2 11/12] arm64: allwinner: a64: enable LCD-related hardware for Pinebook Vasily Khoruzhick
2019-02-03 18:55 ` [PATCH RESEND v2 12/12] arm64: allwinner: a64: enable LCD-related hardware for TERES-I Vasily Khoruzhick
-- strict thread matches above, loose matches on Subject: below --
2018-10-18 7:33 [PATCH 0/9] Analogix ANX6345 RGB-(e)DP bridge support Icenowy Zheng
2018-10-18 7:33 ` [PATCH 1/9] drm/bridge: move ANA78xx driver to analogix subdirectory Icenowy Zheng
2018-10-18 8:47 ` Laurent Pinchart
2018-10-18 7:33 ` [PATCH 2/9] drm/bridge: split some definitions of ANX78xx to dedicated headers Icenowy Zheng
2018-10-18 7:33 ` [PATCH 3/9] drm/bridge: extract some Analogix I2C DP common code Icenowy Zheng
2018-10-18 7:33 ` [PATCH 4/9] dt-bindings: Add ANX6345 DP/eDP transmitter binding Icenowy Zheng
2018-10-18 8:53 ` Laurent Pinchart
2018-10-18 10:00 ` Icenowy Zheng
2018-10-18 11:23 ` Laurent Pinchart
2018-10-18 12:40 ` Icenowy Zheng
2018-10-25 18:30 ` Rob Herring
2018-10-26 0:08 ` Icenowy Zheng
2018-10-18 7:33 ` [PATCH 5/9] drm/bridge: Add Analogix anx6345 support Icenowy Zheng
2018-10-18 7:33 ` [PATCH 6/9] arm64: allwinner: a64: add pinmux for RGB666 LCD Icenowy Zheng
2018-10-18 7:33 ` [PATCH 7/9] arm64: allwinner: a64: enable ANX6345 bridge on Pinebook Icenowy Zheng
2018-10-18 15:17 ` Vasily Khoruzhick
2018-10-19 5:50 ` Icenowy Zheng
2018-10-18 7:33 ` [PATCH 8/9] arm64: allwinner: a64: enable ANX6345 bridge on TERES-I Icenowy Zheng
2018-10-18 7:33 ` [PATCH 9/9] [DO NOT MERGE] drm/sun4i: rgb: Add 5% tolerance to dot clock frequency check Icenowy Zheng
2018-10-18 8:55 ` Laurent Pinchart
2018-10-18 9:18 ` Daniel Vetter
2018-10-18 9:42 ` Maxime Ripard
2018-10-18 11:31 ` Laurent Pinchart
2018-10-18 12:18 ` Maxime Ripard
2018-10-18 12:50 ` Icenowy Zheng
2018-10-18 13:07 ` Maxime Ripard
2018-10-18 13:57 ` Laurent Pinchart
2019-02-03 1:32 ` Vasily Khoruzhick
2018-10-29 2:20 ` [PATCH 0/9] Analogix ANX6345 RGB-(e)DP bridge support Vasily Khoruzhick
2019-02-04 12:22 ` Torsten Duwe
2019-02-04 20:21 ` Vasily Khoruzhick
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