Re: [PATCH v2 1/8] drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support

[Rob Herring <robh@kernel.org>]

On Mon, Mar 11, 2019 at 3:53 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
>
> On 08/03/2019 15:54, Rob Herring wrote:
> > On Fri, Mar 8, 2019 at 2:05 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
> >>
> >> Hi Rob,
> >>
> >> On 08/03/2019 00:13, Rob Herring wrote:
> >>> On Fri, Feb 1, 2019 at 6:08 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
> >>>>
> >>>> Add support for SCDC Setup for TMDS Clock > 3.4GHz and enable TMDS
> >>>> Scrambling when supported or mandatory.
> >>>>
> >>>> This patch also adds an helper to setup the control bit to support
> >>>> the high TMDS Bit Period/TMDS Clock-Period Ratio as required with
> >>>> TMDS Clock > 3.4GHz for HDMI2.0 3840x2160@60/50 modes.
> >>>>
> >>>> These changes were based on work done by Huicong Xu <xhc@rock-chips.com>
> >>>> and Nickey Yang <nickey.yang@rock-chips.com> to support HDMI2.0 modes
> >>>> on the Rockchip 4.4 BSP kernel at [1]
> >>>>
> >>>> [1] https://github.com/rockchip-linux/kernel/tree/release-4.4
> >>>>
> >>>> Cc: Nickey Yang <nickey.yang@rock-chips.com>
> >>>> Cc: Huicong Xu <xhc@rock-chips.com>
> >>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> >>>> Tested-by: Heiko Stuebner <heiko@sntech.de>
> >>>> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
> >>>> ---
> >>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 85 ++++++++++++++++++++++++++++++-
> >>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h |  1 +
> >>>>  include/drm/bridge/dw_hdmi.h              |  1 +
> >>>>  3 files changed, 85 insertions(+), 2 deletions(-)
> >>>
> >>> This commit in drm-misc-next is breaking booting on the Rock960. I
> >>> have FB and fbcon enabled. The boot hangs after this message:
> >>>
> >>> [    3.012334] [drm:rockchip_drm_fbdev_create] FB [1920x1080]-24
> >>> kvaddr=(____ptrval____) offset=0 size=8294400
> >>
> >> Could you give more details on the tree used ? did you bisect to find this commit ?
> >
> > As I said above, drm-misc-next (from drm-misc tree) is the branch. I
> > bisected between it and v5.0. Reverting it fixes booting.
>
> Thanks, could you give more details on the environment ? Did you test over the latest linux-next ?

Here's a log of the drm parts: https://pastebin.com/tFJ9Gs6h

linux-next also hangs.

> Can you share the EDID of your monitor ?

Maybe not mode related. I tried forcing to 1280x720 and it hangs too.
In any case, here's the parsed EDID:

256-byte EDID successfully retrieved from i2c bus 3
Looks like i2c was successful. Have a good day.
Checksum Correct

Section "Monitor"
Identifier "CYS-R101"
ModelName "CYS-R101"
VendorName "CYX"
# Monitor Manufactured week 28 of 2018
# EDID version 1.3
# Digital Display
DisplaySize 220 130
Gamma 2.20
Option "DPMS" "true"
Horizsync 30-102
VertRefresh 48-75
# Maximum pixel clock is 190MHz
#Not giving standard mode: 1920x1080, 60Hz
#Not giving standard mode: 1920x1080, 60Hz
#Not giving standard mode: 1920x1080, 60Hz
#Not giving standard mode: 1440x900, 60Hz
#Not giving standard mode: 1400x1050, 60Hz
#Not giving standard mode: 1280x1024, 60Hz
#Not giving standard mode: 1280x960, 60Hz
#Not giving standard mode: 1280x720, 60Hz

#Extension block found. Parsing...
Modeline "Mode 5" 54.00 2560 2608 2640 2720 1440 1443 1448 1481 +hsync +vsync
Modeline "Mode 0" 267.81 2560 2608 2640 2720 1600 1603 1608 1641 +hsync +vsync
Modeline "Mode 1" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 2" 74.250 1920 2008 2052 2200 1080 1082 1087 1125
+hsync +vsync interlace
Modeline "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 4" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Option "PreferredMode" "Mode 5"
EndSection

> Can you check this patch :

Still hangs with it.

>
> ----><----------------------------------------------------------------------------------------
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index a63e5f0dae56..f33c2ac158c1 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1268,8 +1268,6 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi)
>
>         dw_hdmi_phy_power_off(hdmi);
>
> -       dw_hdmi_set_high_tmds_clock_ratio(hdmi);
> -
>         /* Leave low power consumption mode by asserting SVSRET. */
>         if (phy->has_svsret)
>                 dw_hdmi_phy_enable_svsret(hdmi, 1);
>
>

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