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Date:   Wed, 16 Dec 2020 13:35:43 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Maxime Ripard <maxime@...no.tech>, Eric Anholt <eric@...olt.net>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     Jason Cooper <jason@...edaemon.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-rpi-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 00/15] drm/vc4: hdmi: Add CEC support for the BCM2711

Hi Maxime,

On 10/12/2020 14:46, Maxime Ripard wrote:
> Hi,
> 
> Here's a series introducing the CEC support for the BCM2711 found on the
> RaspberryPi4.
> 
> The BCM2711 HDMI controller uses a similar layout for the CEC registers, the
> main difference being that the interrupt handling part is now shared between
> both HDMI controllers.
> 
> This series is mainly about fixing a couple of bugs, reworking the driver to
> support having two different interrupts, one for each direction, provided by an
> external irqchip, and enables the irqchip driver for the controller we have.
> 
> This has been tested on an RPi3 and RPi4, but requires the latest firmware.
> It's is based on the 10 and 12 bpc series.

This series looks good to me. Before I give my Acked-by for this series, can you
confirm that it is possible to transmit the Image View On message on both outputs
of the RPi4 when the HPD is low?

See section "CEC Without HPD" in https://hverkuil.home.xs4all.nl/cec-status.txt
on how to test this with a Pulse-Eight device.

This should work.

Regards,

	Hans

> 
> Here is the cec-compliance output:
> 
> $ cec-ctl --tuner -p 1.0.0.0
> The CEC adapter doesn't allow setting the physical address manually, ignore this option.
> 
> Driver Info:
> 	Driver Name                : vc4_hdmi
> 	Adapter Name               : vc4
> 	Capabilities               : 0x0000010e
> 		Logical Addresses
> 		Transmit
> 		Passthrough
> 	Driver version             : 5.10.0
> 	Available Logical Addresses: 1
> 	Physical Address           : 1.0.0.0
> 	Logical Address Mask       : 0x0008
> 	CEC Version                : 2.0
> 	Vendor ID                  : 0x000c03 (HDMI)
> 	OSD Name                   : Tuner
> 	Logical Addresses          : 1 (Allow RC Passthrough)
> 
> 	  Logical Address          : 3 (Tuner 1)
> 	    Primary Device Type    : Tuner
> 	    Logical Address Type   : Tuner
> 	    All Device Types       : Tuner
> 	    RC TV Profile          : None
> 	    Device Features        :
> 		None
> 
> $ cec-compliance
> cec-compliance SHA                 : not available
> Driver Info:
> 	Driver Name                : vc4_hdmi
> 	Adapter Name               : vc4
> 	Capabilities               : 0x0000010e
> 		Logical Addresses
> 		Transmit
> 		Passthrough
> 	Driver version             : 5.10.0
> 	Available Logical Addresses: 1
> 	Physical Address           : 1.0.0.0
> 	Logical Address Mask       : 0x0008
> 	CEC Version                : 2.0
> 	Vendor ID                  : 0x000c03 (HDMI)
> 	OSD Name                   : Tuner
> 	Logical Addresses          : 1 (Allow RC Passthrough)
> 
> 	  Logical Address          : 3 (Tuner 1)
> 	    Primary Device Type    : Tuner
> 	    Logical Address Type   : Tuner
> 	    All Device Types       : Tuner
> 	    RC TV Profile          : None
> 	    Device Features        :
> 		None
> 
> Compliance test for vc4_hdmi device /dev/cec0:
> 
>     The test results mean the following:
>         OK                  Supported correctly by the device.
>         OK (Not Supported)  Not supported and not mandatory for the device.
>         OK (Presumed)       Presumably supported.  Manually check to confirm.
>         OK (Unexpected)     Supported correctly but is not expected to be supported for this device.
>         OK (Refused)        Supported by the device, but was refused.
>         FAIL                Failed and was expected to be supported by this device.
> 
> Find remote devices:
> 	Polling: OK
> 
> Network topology:
> 	System Information for device 0 (TV) from device 3 (Tuner 1):
> 		CEC Version                : 2.0
> 		Physical Address           : 0.0.0.0
> 		Primary Device Type        : TV
> 		Vendor ID                  : 0x000c03 (HDMI)
> 		OSD Name                   : 'test-124'
> 		Power Status               : Tx, OK, Rx, OK, Feature Abort
> 
> Total for vc4_hdmi device /dev/cec0: 1, Succeeded: 1, Failed: 0, Warnings: 0
> 
> Let me know what you think,
> Maxime
> 
> Dom Cobley (5):
>   drm/vc4: hdmi: Move hdmi reset to bind
>   drm/vc4: hdmi: Fix register offset with longer CEC messages
>   drm/vc4: hdmi: Fix up CEC registers
>   drm/vc4: hdmi: Restore cec physical address on reconnect
>   drm/vc4: hdmi: Remove cec_available flag
> 
> Maxime Ripard (10):
>   irqchip: Allow to compile bcmstb on other platforms
>   drm/vc4: hdmi: Compute the CEC clock divider from the clock rate
>   drm/vc4: hdmi: Update the CEC clock divider on HSM rate change
>   drm/vc4: hdmi: Introduce a CEC clock
>   drm/vc4: hdmi: Split the interrupt handlers
>   drm/vc4: hdmi: Support BCM2711 CEC interrupt setup
>   drm/vc4: hdmi: Don't register the CEC adapter if there's no interrupts
>   dt-binding: display: bcm2711-hdmi: Add CEC and hotplug interrupts
>   ARM: dts: bcm2711: Add the BSC interrupt controller
>   ARM: dts: bcm2711: Add the CEC interrupt controller
> 
>  .../bindings/display/brcm,bcm2711-hdmi.yaml   |  20 +-
>  arch/arm/boot/dts/bcm2711.dtsi                |  30 +++
>  drivers/gpu/drm/vc4/vc4_hdmi.c                | 224 +++++++++++++-----
>  drivers/gpu/drm/vc4/vc4_hdmi.h                |  11 +-
>  drivers/gpu/drm/vc4/vc4_hdmi_regs.h           |   4 +-
>  drivers/irqchip/Kconfig                       |   2 +-
>  6 files changed, 232 insertions(+), 59 deletions(-)
> 

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