[PATCH v2 0/3] Add initial support for the Rockchip RK3588 HDMI TX Controller

[Piotr Oniszczuk]

> Wiadomość napisana przez Chris Morgan <macroalpha82 at gmail.com> w dniu 05.08.2024, o godz. 18:20:
> 
> On Sat, Aug 03, 2024 at 03:24:06PM +0200, Piotr Oniszczuk wrote:
>> Hi Cristian,
>> 
>> Will you find some time and motivation to add CEC support to Quad-Pixel (QP) TX controller ?
>> 
>> Probably you recall - I added initial CEC support to yours v1 series and i’m stuck with timing issue (cec pulses are 3x too long).
>> For me it looks like clock issue.
>> I’m out of ideas how to move forward with this timming issue….
> 
> I wonder if using the cec-gpio on "GPIO4 RK_PC1" for the CEC gpio and
> "GPIO1 RK_PA5" for the HPD gpio is a possibility? Just a thought.
> 
> Chris

Chris,
Oscilloscope shows pulses on cec line - issue is that cec pulses observed on oscilloscope have timings 2,9 times longer that should be (start bit is 10,7mS instead of 3.6; zero is 4.4 instead 1.5 while one is 1,7 instead of 0.6).
Pulses durations seems to be „proportional" (start; zero; one) - all are almost exact 2.9x too long. 
For me this sounds like wrong clock issue.
I can try switch to gpio outs - but I think better is to first make sure that cec clock is set ok.
Im not sure what is best way to do such cec clock check...   
 
> 
>> 
>> 
>> 
>>> Wiadomość napisana przez Cristian Ciocaltea <cristian.ciocaltea at collabora.com> w dniu 01.08.2024, o godz. 04:25:
>>> 
>>> The Rockchip RK3588 SoC family integrates the Synopsys DesignWare HDMI
>>> 2.1 Quad-Pixel (QP) TX controller [4], which is a new IP block, quite
>>> different from those used in the previous generations of Rockchip SoCs.
>>> 
>>> This is the last component that needs to be supported in order to enable
>>> the HDMI output functionality on the RK3588 based SBCs, such as the
>>> RADXA Rock 5B. The other components are the Video Output Processor
>>> (VOP2) and the Samsung IP based HDMI/eDP TX Combo PHY, for which basic
>>> support has been already made available via [1] and [2], respectively.
>>> 
>>> Please note this is a reworked version of the original series, which
>>> relied on a commonized dw-hdmi approach.  Since the general consensus
>>> was to handle it as an entirely new IP, I dropped all patches related to
>>> the old dw-hdmi and Rockchip glue code - a few of them might still make
>>> sense as general improvements and will be submitted separately.
>>> 
>>> Additionally, as suggested by Neil, I've sent the reworked bridge driver
>>> as a separate patchset [4], hence this series handles now just the new
>>> Rockchip QP platform driver.
>>> 
>>> It's worth mentioning the HDMI output support is currently limited to
>>> RGB output up to 4K at 60Hz, without audio, CEC or any of the HDMI 2.1
>>> specific features.  Moreover, the VOP2 driver is not able to properly
>>> handle all display modes supported by the connected screens, e.g. it
>>> doesn't cope with non-integer refresh rates.
>>> 
>>> A possible workaround consists of enabling the display controller to
>>> make use of the clock provided by the HDMI PHY PLL. This is still work
>>> in progress and will be submitted later, as well as the required DTS
>>> updates.
>>> 
>>> To facilitate testing and experimentation, all HDMI output related
>>> patches, including those part of this series, as well as the bridge
>>> driver, are available at [3].
>>> 
>>> So far I could only verify this on the RADXA Rock 5B board.
>>> 
>>> Thanks,
>>> Cristian
>>> 
>>> [1]: 5a028e8f062f ("drm/rockchip: vop2: Add support for rk3588")
>>> [2]: 553be2830c5f ("phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver")
>>> [3]: https://gitlab.collabora.com/hardware-enablement/rockchip-3588/linux/-/commits/rk3588-hdmi-bridge-v6.11-rc1
>>> [4]: https://lore.kernel.org/lkml/20240801-dw-hdmi-qp-tx-v1-0-148f542de5fd@collabora.com/
>>> 
>>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
>>> ---
>>> Changes in v2:
>>> - Reworked the glue code for RK3588 into a new Rockchip platform driver
>>> - Moved bridge driver patches to a separate series [4]
>>> - Dropped all the patches touching to the old dw-hdmi and RK platform
>>> drivers
>>> - Added connector creation to ensure the HDMI QP bridge driver does only
>>> support DRM_BRIDGE_ATTACH_NO_CONNECTOR
>>> - Link to v1: https://lore.kernel.org/r/20240601-b4-rk3588-bridge-upstream-v1-0-f6203753232b@collabora.com
>>> 
>>> ---
>>> Cristian Ciocaltea (3):
>>>     dt-bindings: display: rockchip: Add schema for RK3588 HDMI TX Controller
>>>     drm/rockchip: Explicitly include bits header
>>>     drm/rockchip: Add basic RK3588 HDMI output support
>>> 
>>> .../display/rockchip/rockchip,dw-hdmi-qp.yaml      | 188 +++++++++
>>> drivers/gpu/drm/rockchip/Kconfig                   |   8 +
>>> drivers/gpu/drm/rockchip/Makefile                  |   1 +
>>> drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c     | 430 +++++++++++++++++++++
>>> drivers/gpu/drm/rockchip/rockchip_drm_drv.c        |   2 +
>>> drivers/gpu/drm/rockchip/rockchip_drm_drv.h        |   4 +-
>>> 6 files changed, 632 insertions(+), 1 deletion(-)
>>> ---
>>> base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
>>> change-id: 20240601-b4-rk3588-bridge-upstream-a27baff1b8fc
>>> 
>>> 
>>> _______________________________________________
>>> Linux-rockchip mailing list
>>> Linux-rockchip at lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-rockchip
>> 
>>