From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Jagan Teki <jagan@amarulasolutions.com>
Cc: Chen-Yu Tsai <wens@csie.org>, Icenowy Zheng <icenowy@aosc.io>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Vasily Khoruzhick <anarsoul@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
David Airlie <airlied@linux.ie>,
dri-devel <dri-devel@lists.freedesktop.org>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>,
linux-clk <linux-clk@vger.kernel.org>,
Michael Trimarchi <michael@amarulasolutions.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
devicetree <devicetree@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-sunxi@googlegroups.com, linux-amarula@amarulasolutions.com
Subject: Re: [PATCH v4 08/26] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation
Date: Tue, 20 Nov 2018 16:57:15 +0100 [thread overview]
Message-ID: <20181120155715.andrjp5kg6ugcv72@flea> (raw)
In-Reply-To: <CAMty3ZAEHiovm6OF6JvJVQR4aqpG1Q3ML5YqxJkF2ntwRkUO=A@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 2616 bytes --]
On Thu, Nov 15, 2018 at 11:19:53PM +0530, Jagan Teki wrote:
> On Thu, Nov 15, 2018 at 3:26 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> >
> > Hi,
> >
> > On Tue, Nov 13, 2018 at 04:46:15PM +0530, Jagan Teki wrote:
> > > The horizontal and vertical back porch calculation in BSP
> > > code is simply following the Linux drm comment diagram, in
> > > include/drm/drm_modes.h which is
> > >
> > > [hv]back porch = [hv]total - [hv]sync_end
> > >
> > > BSP code form BPI-M64-bsp is calculating vertical back porch as
> > > (from linux-sunxi/drivers/video/sunxi/disp2/disp/de/disp_lcd.c)
> > >
> > > timmings->ver_sync_time= panel_info->lcd_vspw;
> > > timmings->ver_back_porch= panel_info->lcd_vbp-panel_info->lcd_vspw;
> > >
> > > vbp = panel->lcd_vbp;
> > > vspw = panel->lcd_vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = vbp-vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = panel->lcd_vbp - panel->lcd_vspw;
> > > => timmings->ver_back_porch + panel_info->lcd_vspw - panel_info->lcd_vspw
> > > => timmings->ver_back_porch
> > > => mode->vtotal - mode->end
> > >
> > > Which evatually same as mode->vtotal - mode->vsync_end so update the
> > > same in SUN6I_DSI_BASIC_SIZE0_VBP
> > >
> > > On the information note, existing SUN6I_DSI_BASIC_SIZE0_VSA is proper
> > > value.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> >
> > I've tested your changes on my A33 board, and this commit will break
> > it.
> >
> > It creates vblank timeouts, and visual artifacts at the bottom of the
> > display.
>
> Strange, VBP is earlier gives front porch which is anyway wrong.
>
> >
> > Later commits seem to fix the issue, but will create some blanking on
> > the upper third of the display.
> >
> > Since the documentation is quite sparse, and a MIPI-DSI analyzer is
> > way too expensive, I'd really like to have at least what each of these
> > commits are actually fixing, and what symptoms each of these were
> > causing, and not just "the BSP does it".
>
> W/o this 2-lane panel is breaking, same vblank timeout and visual
> artifacts at the bottom of the panel. though the commits may reference
> BSP, I have at-least tested on 3 different panels for us to prove its
> working.
>
> > Having some datasheet for the panels you had working would help too.
>
> Unfortunately datasheet doesn't have any required information what we
> actually looking for.
Not even the timings? How did you get that information then?
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
To: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>,
Jernej Skrabec <jernej.skrabec-gGgVlfcn5nU@public.gmane.org>,
Vasily Khoruzhick
<anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
dri-devel
<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
Michael Turquette
<mturquette-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
Stephen Boyd <sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
linux-clk <linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Michael Trimarchi
<michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>,
linux-arm-kernel
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org,
linux-amarula-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org
Subject: Re: [PATCH v4 08/26] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation
Date: Tue, 20 Nov 2018 16:57:15 +0100 [thread overview]
Message-ID: <20181120155715.andrjp5kg6ugcv72@flea> (raw)
In-Reply-To: <CAMty3ZAEHiovm6OF6JvJVQR4aqpG1Q3ML5YqxJkF2ntwRkUO=A@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 2603 bytes --]
On Thu, Nov 15, 2018 at 11:19:53PM +0530, Jagan Teki wrote:
> On Thu, Nov 15, 2018 at 3:26 PM Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org> wrote:
> >
> > Hi,
> >
> > On Tue, Nov 13, 2018 at 04:46:15PM +0530, Jagan Teki wrote:
> > > The horizontal and vertical back porch calculation in BSP
> > > code is simply following the Linux drm comment diagram, in
> > > include/drm/drm_modes.h which is
> > >
> > > [hv]back porch = [hv]total - [hv]sync_end
> > >
> > > BSP code form BPI-M64-bsp is calculating vertical back porch as
> > > (from linux-sunxi/drivers/video/sunxi/disp2/disp/de/disp_lcd.c)
> > >
> > > timmings->ver_sync_time= panel_info->lcd_vspw;
> > > timmings->ver_back_porch= panel_info->lcd_vbp-panel_info->lcd_vspw;
> > >
> > > vbp = panel->lcd_vbp;
> > > vspw = panel->lcd_vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = vbp-vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = panel->lcd_vbp - panel->lcd_vspw;
> > > => timmings->ver_back_porch + panel_info->lcd_vspw - panel_info->lcd_vspw
> > > => timmings->ver_back_porch
> > > => mode->vtotal - mode->end
> > >
> > > Which evatually same as mode->vtotal - mode->vsync_end so update the
> > > same in SUN6I_DSI_BASIC_SIZE0_VBP
> > >
> > > On the information note, existing SUN6I_DSI_BASIC_SIZE0_VSA is proper
> > > value.
> > >
> > > Signed-off-by: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
> >
> > I've tested your changes on my A33 board, and this commit will break
> > it.
> >
> > It creates vblank timeouts, and visual artifacts at the bottom of the
> > display.
>
> Strange, VBP is earlier gives front porch which is anyway wrong.
>
> >
> > Later commits seem to fix the issue, but will create some blanking on
> > the upper third of the display.
> >
> > Since the documentation is quite sparse, and a MIPI-DSI analyzer is
> > way too expensive, I'd really like to have at least what each of these
> > commits are actually fixing, and what symptoms each of these were
> > causing, and not just "the BSP does it".
>
> W/o this 2-lane panel is breaking, same vblank timeout and visual
> artifacts at the bottom of the panel. though the commits may reference
> BSP, I have at-least tested on 3 different panels for us to prove its
> working.
>
> > Having some datasheet for the panels you had working would help too.
>
> Unfortunately datasheet doesn't have any required information what we
> actually looking for.
Not even the timings? How did you get that information then?
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
WARNING: multiple messages have this Message-ID (diff)
From: maxime.ripard@bootlin.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 08/26] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation
Date: Tue, 20 Nov 2018 16:57:15 +0100 [thread overview]
Message-ID: <20181120155715.andrjp5kg6ugcv72@flea> (raw)
In-Reply-To: <CAMty3ZAEHiovm6OF6JvJVQR4aqpG1Q3ML5YqxJkF2ntwRkUO=A@mail.gmail.com>
On Thu, Nov 15, 2018 at 11:19:53PM +0530, Jagan Teki wrote:
> On Thu, Nov 15, 2018 at 3:26 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> >
> > Hi,
> >
> > On Tue, Nov 13, 2018 at 04:46:15PM +0530, Jagan Teki wrote:
> > > The horizontal and vertical back porch calculation in BSP
> > > code is simply following the Linux drm comment diagram, in
> > > include/drm/drm_modes.h which is
> > >
> > > [hv]back porch = [hv]total - [hv]sync_end
> > >
> > > BSP code form BPI-M64-bsp is calculating vertical back porch as
> > > (from linux-sunxi/drivers/video/sunxi/disp2/disp/de/disp_lcd.c)
> > >
> > > timmings->ver_sync_time= panel_info->lcd_vspw;
> > > timmings->ver_back_porch= panel_info->lcd_vbp-panel_info->lcd_vspw;
> > >
> > > vbp = panel->lcd_vbp;
> > > vspw = panel->lcd_vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = vbp-vspw;
> > > dsi_dev[sel]->dsi_basic_size0.bits.vbp = panel->lcd_vbp - panel->lcd_vspw;
> > > => timmings->ver_back_porch + panel_info->lcd_vspw - panel_info->lcd_vspw
> > > => timmings->ver_back_porch
> > > => mode->vtotal - mode->end
> > >
> > > Which evatually same as mode->vtotal - mode->vsync_end so update the
> > > same in SUN6I_DSI_BASIC_SIZE0_VBP
> > >
> > > On the information note, existing SUN6I_DSI_BASIC_SIZE0_VSA is proper
> > > value.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> >
> > I've tested your changes on my A33 board, and this commit will break
> > it.
> >
> > It creates vblank timeouts, and visual artifacts at the bottom of the
> > display.
>
> Strange, VBP is earlier gives front porch which is anyway wrong.
>
> >
> > Later commits seem to fix the issue, but will create some blanking on
> > the upper third of the display.
> >
> > Since the documentation is quite sparse, and a MIPI-DSI analyzer is
> > way too expensive, I'd really like to have at least what each of these
> > commits are actually fixing, and what symptoms each of these were
> > causing, and not just "the BSP does it".
>
> W/o this 2-lane panel is breaking, same vblank timeout and visual
> artifacts at the bottom of the panel. though the commits may reference
> BSP, I have at-least tested on 3 different panels for us to prove its
> working.
>
> > Having some datasheet for the panels you had working would help too.
>
> Unfortunately datasheet doesn't have any required information what we
> actually looking for.
Not even the timings? How did you get that information then?
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2018-11-20 15:57 UTC|newest]
Thread overview: 137+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-13 11:16 [PATCH v4 00/26] drm/sun4i: Allwinner A64 MIPI-DSI support Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 01/26] clk: sunxi-ng: a64: Fix gate bit of DSI DPHY Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 13:08 ` Maxime Ripard
2018-11-13 13:08 ` Maxime Ripard
2018-11-13 13:08 ` Maxime Ripard
2018-11-13 11:16 ` [PATCH v4 02/26] clk: sunxi-ng: Add check for minimal rate to NKM PLLs Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 03/26] clk: sunxi-ng: Add check for maximum " Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 13:26 ` Maxime Ripard
2018-11-13 13:26 ` Maxime Ripard
2018-11-15 15:21 ` Jagan Teki
2018-11-15 15:21 ` Jagan Teki
2018-11-15 15:21 ` Jagan Teki
2018-11-20 10:55 ` Maxime Ripard
2018-11-20 10:55 ` Maxime Ripard
2018-11-20 12:07 ` Jagan Teki
2018-11-20 12:07 ` Jagan Teki
2018-11-20 12:07 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 04/26] drm/sun4i: sun6i_mipi_dsi: Add has_mod_clk quirk Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 05/26] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 06/26] dt-bindings: sun6i-dsi: Add compatible for A64 MIPI DSI Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 07/26] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 08/26] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-15 9:55 ` Maxime Ripard
2018-11-15 9:55 ` Maxime Ripard
2018-11-15 9:55 ` Maxime Ripard
2018-11-15 17:49 ` Jagan Teki
2018-11-15 17:49 ` Jagan Teki
2018-11-15 17:49 ` Jagan Teki
2018-11-20 15:57 ` Maxime Ripard [this message]
2018-11-20 15:57 ` Maxime Ripard
2018-11-20 15:57 ` Maxime Ripard
2018-11-20 16:25 ` Jagan Teki
2018-11-20 16:25 ` Jagan Teki
2018-11-20 16:25 ` Jagan Teki
2018-11-26 12:07 ` [linux-sunxi] " Jagan Teki
2018-11-26 12:07 ` Jagan Teki
2018-11-26 12:07 ` Jagan Teki
2018-11-27 10:25 ` [linux-sunxi] " Maxime Ripard
2018-11-27 10:25 ` Maxime Ripard
2018-11-27 10:25 ` Maxime Ripard
2018-11-27 10:24 ` Maxime Ripard
2018-11-27 10:24 ` Maxime Ripard
2018-11-27 10:24 ` Maxime Ripard
2018-11-27 11:04 ` [linux-sunxi] " Jagan Teki
2018-11-27 11:04 ` Jagan Teki
2018-11-27 11:04 ` Jagan Teki
2018-12-07 13:21 ` [linux-sunxi] " Maxime Ripard
2018-12-07 13:21 ` Maxime Ripard
2018-12-07 13:21 ` Maxime Ripard
2018-12-10 16:07 ` Jagan Teki
2018-12-10 16:07 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 09/26] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 10/26] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 11/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 12/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hblk timing calculation Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 13/26] drm/sun4i: sun6i_mipi_dsi: Add DSI hblk packet overhead Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 14/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 15/26] drm/sun4i: sun6i_mipi_dsi: Set proper vblk timing calculation Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 16/26] drm/sun4i: sun6i_mipi_dsi: Add support for VCC-DSI voltage regulator Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 17/26] dt-bindings: sun6i-dsi: Add VCC-DSI supply property Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-16 23:19 ` Rob Herring
2018-11-16 23:19 ` Rob Herring
2018-11-16 23:19 ` Rob Herring
2018-11-13 11:16 ` [PATCH v4 18/26] dt-bindings: panel: Add Bananapi S070WV20-CT16 ICN6211 MIPI-DSI to RGB bridge Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 19/26] drm/panel: " Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 20/26] dt-bindings: panel: Add Techstar TS8550B MIPI-DSI panel Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 21/26] drm/panel: Add Techstar TS8550B MIPI-DSI LCD panel Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 22/26] clk: sunxi-ng: a64: Add min and max rate for PLL_MIPI Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 23/26] dt-bindings: sun6i-dsi: Add compatible for A64 DPHY Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 24/26] arm64: dts: allwinner: a64: Add DSI pipeline Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 25/26] [DO NOT MERGE] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 12:22 ` Andre Przywara
2018-11-13 12:22 ` Andre Przywara
2018-11-13 12:22 ` Andre Przywara
2018-11-14 6:31 ` Jagan Teki
2018-11-14 6:31 ` Jagan Teki
2018-11-14 6:31 ` Jagan Teki
2018-11-14 6:58 ` Chen-Yu Tsai
2018-11-14 6:58 ` Chen-Yu Tsai
2018-11-14 6:58 ` Chen-Yu Tsai
2018-11-14 9:22 ` Chen-Yu Tsai
2018-11-14 9:22 ` Chen-Yu Tsai
2018-11-14 9:22 ` Chen-Yu Tsai
2018-11-14 11:18 ` Jagan Teki
2018-11-14 11:18 ` Jagan Teki
2018-11-14 11:18 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 26/26] arm64: dts: allwinner: a64-amarula-relic: Enable Techstar TS8550B MIPI-DSI panel Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 11:16 ` Jagan Teki
2018-11-13 12:32 ` Andre Przywara
2018-11-13 12:32 ` Andre Przywara
2018-11-13 12:32 ` Andre Przywara
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