[Letux-kernel] [PATCH 8/8] drm/ingenic: Attach bridge chain to encoders
paul at crapouillou.net
Tue Aug 10 09:52:36 CEST 2021
Le mar., août 10 2021 at 01:17:20 +0200, Paul Boddie
<paul at boddie.org.uk> a écrit :
> On Monday, 9 August 2021 18:22:12 CEST Paul Cercueil wrote:
>> Le lun., août 9 2021 at 13:14:03 +0200, H. Nikolaus Schaller
> <hns at goldelico.com> a écrit :
>> > quick feedback: our HDMI on top compiles fine after fixing 2 merge
>> > conflicts, but dos not yet work.
>> > Will need some spare time with access to the CI20 board to
>> > the issue, i.e. can not give feedback immediately.
>> Alright, no problem. I'll be back home in about 2 weeks and then I
>> test on my CI20 as well.
> Just for reference, I looked into this initialisation failure. The
> peripheral driver gets initialised satisfactorily...
> dw-hdmi-ingenic 10180000.hdmi: Detected HDMI TX controller v1.31a
> with HDCP
> (DWC HDMI 3D TX PHY)
> dw-hdmi-ingenic 10180000.hdmi: registered DesignWare HDMI I2C bus
> But then the reported error occurs in the DRM driver:
> ingenic-drm 13050000.lcdc0: Unable to init connector
> ingenic-drm: probe of 13050000.lcdc0 failed with error -22
> This originates in a call to drm_bridge_connector_init from
> connector = drm_bridge_connector_init(drm, encoder);
> The invoked function iterates over the registered bridges, one of
> which seems
> to be the HDMI peripheral (it has bridge operations defined
> identically to
> those specified in the Synopsys driver), but the type member of the
> structure is set to 0 (DRM_MODE_CONNECTOR_Unknown).
> I might expect the bridge to expose a type acquired from its
> connector, but I
> don't see this propagation occurring in the Synopsys driver:
> sets the bridge operations and other members of the drm_bridge
> structure, but
> it doesn't set the type.
> Also, it might be possible that dw_hdmi_connector_detect (exposed as
> detect operation) is not getting called, and this would explain why
> bridge's connector member does not have the connector_type set,
> either (since
> it is also set to 0).
From what I understand the last bridge in the chained list is supposed
to set the connector type. The HDMI driver's probe function should get
a pointer to the next bridge in the queue and attach it (see how
ite-it66121.c does it). The last bridge in the queue should be
"hdmi-connector" (display-connector.c) which will effectively set the
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