From: Daniel Vetter <daniel@ffwll.ch> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Icenowy Zheng <icenowy@aosc.io>, devicetree@vger.kernel.org, Dave Airlie <airlied@linux.ie>, linux-sunxi <linux-sunxi@googlegroups.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, dri-devel <dri-devel@lists.freedesktop.org>, Maxime Ripard <maxime.ripard@bootlin.com>, Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH 9/9] [DO NOT MERGE] drm/sun4i: rgb: Add 5% tolerance to dot clock frequency check Date: Thu, 18 Oct 2018 11:18:06 +0200 [thread overview] Message-ID: <CAKMK7uFp2c=wqzPi096MTRB6Cdfacerkp6dM=fEqCAr99PQG9w@mail.gmail.com> (raw) In-Reply-To: <4168274.Gmp9JTCfJR@avalon> On Thu, Oct 18, 2018 at 10:55 AM Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > > Hi Icenowy, > > Thank you for the patch. > > On Thursday, 18 October 2018 10:33:27 EEST Icenowy Zheng wrote: > > From: Chen-Yu Tsai <wens@csie.org> > > > > The panels shipped with Allwinner devices are very "generic", i.e. > > they do not have model numbers or reliable sources of information > > for the timings (that we know of) other than the fex files shipped > > on them. The dot clock frequency provided in the fex files have all > > been rounded to the nearest MHz, as that is the unit used in them. > > > > We were using the simple panel "urt,umsh-8596md-t" as a substitute > > for the A13 Q8 tablets in the absence of a specific model for what > > may be many different but otherwise timing compatible panels. This > > was usable without any visual artifacts or side effects, until the > > dot clock rate check was added in commit bb43d40d7c83 ("drm/sun4i: > > rgb: Validate the clock rate"). > > > > The reason this check fails is because the dotclock frequency for > > this model is 33.26 MHz, which is not achievable with our dot clock > > hardware, and the rate returned by clk_round_rate deviates slightly, > > causing the driver to reject the display mode. > > > > The LCD panels have some tolerance on the dot clock frequency, even > > if it's not specified in their datasheets. > > > > This patch adds a 5% tolerence to the dot clock check. > > Why do you think this shouldn't be merged ? It pisses of a lot of people who really insist upon accurate timing. I think a better fix would be to have a dotclock range in drm_panel, and some magic to figure out which one of these we can actually do. Then tell userspace that this is the mode is should request. That way userspace knows what the actual dotclock/refresh rate is, and the panel still works. -Daniel > > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> > > --- > > drivers/gpu/drm/sun4i/sun4i_rgb.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c > > b/drivers/gpu/drm/sun4i/sun4i_rgb.c index bf068da6b12e..23bdc449eacc 100644 > > --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c > > +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c > > @@ -92,13 +92,14 @@ static enum drm_mode_status sun4i_rgb_mode_valid(struct > > drm_encoder *crtc, > > > > DRM_DEBUG_DRIVER("Vertical parameters OK\n"); > > > > + /* Check against a 5% tolerance for the dot clock */ > > tcon->dclk_min_div = 6; > > tcon->dclk_max_div = 127; > > rounded_rate = clk_round_rate(tcon->dclk, rate); > > - if (rounded_rate < rate) > > + if (rounded_rate < rate * 19 / 20 ) > > return MODE_CLOCK_LOW; > > > > - if (rounded_rate > rate) > > + if (rounded_rate > rate * 21 / 20) > > return MODE_CLOCK_HIGH; > > > > DRM_DEBUG_DRIVER("Clock rate OK\n"); > > -- > Regards, > > Laurent Pinchart > > > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
WARNING: multiple messages have this Message-ID (diff)
From: daniel@ffwll.ch (Daniel Vetter) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 9/9] [DO NOT MERGE] drm/sun4i: rgb: Add 5% tolerance to dot clock frequency check Date: Thu, 18 Oct 2018 11:18:06 +0200 [thread overview] Message-ID: <CAKMK7uFp2c=wqzPi096MTRB6Cdfacerkp6dM=fEqCAr99PQG9w@mail.gmail.com> (raw) In-Reply-To: <4168274.Gmp9JTCfJR@avalon> On Thu, Oct 18, 2018 at 10:55 AM Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > > Hi Icenowy, > > Thank you for the patch. > > On Thursday, 18 October 2018 10:33:27 EEST Icenowy Zheng wrote: > > From: Chen-Yu Tsai <wens@csie.org> > > > > The panels shipped with Allwinner devices are very "generic", i.e. > > they do not have model numbers or reliable sources of information > > for the timings (that we know of) other than the fex files shipped > > on them. The dot clock frequency provided in the fex files have all > > been rounded to the nearest MHz, as that is the unit used in them. > > > > We were using the simple panel "urt,umsh-8596md-t" as a substitute > > for the A13 Q8 tablets in the absence of a specific model for what > > may be many different but otherwise timing compatible panels. This > > was usable without any visual artifacts or side effects, until the > > dot clock rate check was added in commit bb43d40d7c83 ("drm/sun4i: > > rgb: Validate the clock rate"). > > > > The reason this check fails is because the dotclock frequency for > > this model is 33.26 MHz, which is not achievable with our dot clock > > hardware, and the rate returned by clk_round_rate deviates slightly, > > causing the driver to reject the display mode. > > > > The LCD panels have some tolerance on the dot clock frequency, even > > if it's not specified in their datasheets. > > > > This patch adds a 5% tolerence to the dot clock check. > > Why do you think this shouldn't be merged ? It pisses of a lot of people who really insist upon accurate timing. I think a better fix would be to have a dotclock range in drm_panel, and some magic to figure out which one of these we can actually do. Then tell userspace that this is the mode is should request. That way userspace knows what the actual dotclock/refresh rate is, and the panel still works. -Daniel > > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> > > --- > > drivers/gpu/drm/sun4i/sun4i_rgb.c | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c > > b/drivers/gpu/drm/sun4i/sun4i_rgb.c index bf068da6b12e..23bdc449eacc 100644 > > --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c > > +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c > > @@ -92,13 +92,14 @@ static enum drm_mode_status sun4i_rgb_mode_valid(struct > > drm_encoder *crtc, > > > > DRM_DEBUG_DRIVER("Vertical parameters OK\n"); > > > > + /* Check against a 5% tolerance for the dot clock */ > > tcon->dclk_min_div = 6; > > tcon->dclk_max_div = 127; > > rounded_rate = clk_round_rate(tcon->dclk, rate); > > - if (rounded_rate < rate) > > + if (rounded_rate < rate * 19 / 20 ) > > return MODE_CLOCK_LOW; > > > > - if (rounded_rate > rate) > > + if (rounded_rate > rate * 21 / 20) > > return MODE_CLOCK_HIGH; > > > > DRM_DEBUG_DRIVER("Clock rate OK\n"); > > -- > Regards, > > Laurent Pinchart > > > > _______________________________________________ > dri-devel mailing list > dri-devel at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2018-10-18 9:18 UTC|newest] Thread overview: 176+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-10-18 7:33 [PATCH 0/9] Analogix ANX6345 RGB-(e)DP bridge support Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 7:33 ` [PATCH 1/9] drm/bridge: move ANA78xx driver to analogix subdirectory Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 8:47 ` Laurent Pinchart 2018-10-18 8:47 ` Laurent Pinchart 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 ` Icenowy Zheng 2018-10-18 7:33 ` 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 ` Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 7:33 ` [PATCH 4/9] dt-bindings: Add ANX6345 DP/eDP transmitter binding Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 8:53 ` Laurent Pinchart 2018-10-18 8:53 ` Laurent Pinchart 2018-10-18 8:53 ` Laurent Pinchart 2018-10-18 10:00 ` Icenowy Zheng 2018-10-18 10:00 ` Icenowy Zheng 2018-10-18 11:23 ` Laurent Pinchart 2018-10-18 11:23 ` Laurent Pinchart 2018-10-18 11:23 ` Laurent Pinchart 2018-10-18 12:40 ` Icenowy Zheng 2018-10-18 12:40 ` Icenowy Zheng 2018-10-25 18:30 ` Rob Herring 2018-10-25 18:30 ` Rob Herring 2018-10-25 18:30 ` Rob Herring 2018-10-26 0:08 ` Icenowy Zheng 2018-10-26 0:08 ` Icenowy Zheng 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 ` Icenowy Zheng 2018-10-18 7:33 ` 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 ` Icenowy Zheng 2018-10-18 7:33 ` [PATCH 7/9] arm64: allwinner: a64: enable ANX6345 bridge on Pinebook Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 15:17 ` Vasily Khoruzhick 2018-10-18 15:17 ` Vasily Khoruzhick 2018-10-19 5:50 ` Icenowy Zheng 2018-10-19 5:50 ` Icenowy Zheng 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 ` 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 7:33 ` Icenowy Zheng 2018-10-18 7:33 ` Icenowy Zheng 2018-10-18 8:55 ` Laurent Pinchart 2018-10-18 8:55 ` Laurent Pinchart 2018-10-18 8:55 ` Laurent Pinchart 2018-10-18 9:18 ` Daniel Vetter [this message] 2018-10-18 9:18 ` Daniel Vetter 2018-10-18 9:42 ` Maxime Ripard 2018-10-18 9:42 ` Maxime Ripard 2018-10-18 9:42 ` Maxime Ripard 2018-10-18 11:31 ` Laurent Pinchart 2018-10-18 11:31 ` Laurent Pinchart 2018-10-18 11:31 ` Laurent Pinchart 2018-10-18 12:18 ` Maxime Ripard 2018-10-18 12:18 ` Maxime Ripard 2018-10-18 12:18 ` Maxime Ripard 2018-10-18 12:50 ` Icenowy Zheng 2018-10-18 12:50 ` Icenowy Zheng 2018-10-18 12:50 ` Icenowy Zheng 2018-10-18 13:07 ` Maxime Ripard 2018-10-18 13:07 ` Maxime Ripard 2018-10-18 13:07 ` Maxime Ripard 2018-10-18 13:57 ` Laurent Pinchart 2018-10-18 13:57 ` Laurent Pinchart 2018-10-18 13:57 ` Laurent Pinchart 2019-02-03 1:32 ` Vasily Khoruzhick 2019-02-03 1:32 ` Vasily Khoruzhick 2019-02-03 1:32 ` Vasily Khoruzhick 2018-10-18 12:25 ` Stefan Monnier 2018-10-29 2:20 ` [PATCH 0/9] Analogix ANX6345 RGB-(e)DP bridge support Vasily Khoruzhick 2018-10-29 2:20 ` Vasily Khoruzhick 2019-02-04 12:22 ` Torsten Duwe 2019-02-04 12:22 ` Torsten Duwe 2019-02-04 20:21 ` Vasily Khoruzhick 2019-02-04 20:21 ` Vasily Khoruzhick 2019-02-04 20:21 ` Vasily Khoruzhick 2019-02-03 18:54 [PATCH RESEND v2 00/12] " Vasily Khoruzhick 2019-02-03 18:54 ` Vasily Khoruzhick [not found] ` <20190203185501.8958-1-anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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 ` 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 ` 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 ` 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 ` Vasily Khoruzhick 2019-02-03 18:54 ` [PATCH RESEND v2 05/12] drm/bridge: Add Analogix anx6345 support Vasily Khoruzhick 2019-02-03 18:54 ` Vasily Khoruzhick 2019-02-05 13:19 ` Torsten Duwe 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 2019-02-03 18:54 ` Vasily Khoruzhick [not found] ` <20190203185501.8958-7-anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2019-02-04 14:20 ` Maxime Ripard 2019-02-04 14:20 ` Maxime Ripard 2019-02-04 16:26 ` Vasily Khoruzhick 2019-02-04 16:26 ` Vasily Khoruzhick [not found] ` <CA+E=qVfTfJ9E29gz83tdVGx5_KGWSQVJOAxKTzC+-n7=gdj0cA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 16:28 ` Icenowy Zheng 2019-02-04 16:28 ` Icenowy Zheng [not found] ` <0F6CBEA4-6DB6-40F1-A2FD-65101AF64F1F-h8G6r0blFSE@public.gmane.org> 2019-02-04 18:50 ` Vasily Khoruzhick 2019-02-04 18:50 ` [linux-sunxi] " Vasily Khoruzhick [not found] ` <CA+E=qVd7yh=JNZSvrfY4Diu+VJWFK6yLUJ5MavBcZ8Cftn6f-Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-05 15:41 ` Maxime Ripard 2019-02-05 15:41 ` [linux-sunxi] " Maxime Ripard 2019-02-05 17:49 ` Vasily Khoruzhick 2019-02-05 17:49 ` [linux-sunxi] " Vasily Khoruzhick 2019-02-06 9:16 ` Maxime Ripard 2019-02-06 9:16 ` Maxime Ripard 2019-02-06 11:42 ` Thierry Reding 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 ` Vasily Khoruzhick 2019-02-03 18:54 ` [PATCH RESEND v2 08/12] dt-bindings: add binding for generic eDP panel Vasily Khoruzhick 2019-02-03 18:54 ` Vasily Khoruzhick [not found] ` <20190203185501.8958-9-anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2019-02-04 7:43 ` Thierry Reding 2019-02-04 7:43 ` Thierry Reding 2019-02-04 8:13 ` Vasily Khoruzhick 2019-02-04 8:13 ` Vasily Khoruzhick [not found] ` <CA+E=qVecudACOEXt74Kf=UA_F-uuHgEqHzKpYAq1ocMx3Sx+eQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 8:23 ` Thierry Reding 2019-02-04 8:23 ` Thierry Reding 2019-02-04 9:40 ` Daniel Vetter 2019-02-04 9:40 ` Daniel Vetter [not found] ` <20190204094012.GP3271-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org> 2019-02-04 11:22 ` Thierry Reding 2019-02-04 11:22 ` Thierry Reding 2019-02-04 15:59 ` Daniel Vetter 2019-02-04 15:59 ` Daniel Vetter [not found] ` <20190204155909.GU3271-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org> 2019-02-04 16:22 ` Thierry Reding 2019-02-04 16:22 ` Thierry Reding 2019-02-05 8:57 ` Daniel Vetter 2019-02-05 8:57 ` Daniel Vetter 2019-02-05 10:24 ` Thierry Reding 2019-02-05 10:24 ` Thierry Reding 2019-02-05 16:36 ` Daniel Vetter 2019-02-05 16:36 ` Daniel Vetter [not found] ` <20190205163649.GG3271-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org> 2019-02-14 19:51 ` Vasily Khoruzhick 2019-02-14 19:51 ` Vasily Khoruzhick 2019-02-14 20:05 ` Vasily Khoruzhick 2019-02-14 20:05 ` Vasily Khoruzhick [not found] ` <CA+E=qVcUsz=5s1+RqDdQ4Hm3_Q3jDFuZwuYXUuVx3ubFWmcG7w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-14 20:38 ` Rob Herring 2019-02-14 20:38 ` Rob Herring [not found] ` <CAL_JsqKQ0EmyYGYvz__ZZGN7_6jLezevHWc+psn82Uy6hWZXMA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-14 20:54 ` Vasily Khoruzhick 2019-02-14 20:54 ` Vasily Khoruzhick 2019-02-04 16:11 ` Vasily Khoruzhick 2019-02-04 16:11 ` Vasily Khoruzhick [not found] ` <CA+E=qVew+8__yrAud1gFnLQ8HCwDdGhVjV=c173HGvZxH=7zZQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 16:27 ` Thierry Reding 2019-02-04 16:27 ` Thierry Reding 2019-02-04 16:39 ` Rob Herring 2019-02-04 16:39 ` Rob Herring [not found] ` <CAL_JsqLAODca_U94hCi9O3E6XiUjAYCoL7_0gkf_eMY0nnT8Ag-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 17:02 ` Vasily Khoruzhick 2019-02-04 17:02 ` [linux-sunxi] " Vasily Khoruzhick 2019-02-04 16:27 ` Rob Herring 2019-02-04 16:27 ` Rob Herring [not found] ` <CAL_JsqKt1kOXmRNvkYsQ6AL69+TPZURKpDbKkkEUb2+KZ5hKjQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 16:56 ` Thierry Reding 2019-02-04 16:56 ` Thierry Reding 2019-02-04 17:07 ` Vasily Khoruzhick 2019-02-04 17:07 ` Vasily Khoruzhick 2019-02-04 20:23 ` Rob Herring 2019-02-04 20:23 ` Rob Herring [not found] ` <CAL_JsqJx98DfHZSafiXA8QiO=bn1zy8g6keQ15L=cUmbVkTTOA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2019-02-04 20:26 ` Vasily Khoruzhick 2019-02-04 20:26 ` Vasily Khoruzhick 2019-02-04 20:34 ` Rob Herring 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 ` 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 18:54 ` 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 ` Vasily Khoruzhick 2019-02-03 18:55 ` [PATCH RESEND v2 12/12] arm64: allwinner: a64: enable LCD-related hardware for TERES-I Vasily Khoruzhick 2019-02-03 18:55 ` Vasily Khoruzhick
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