From: Damian Kos <dkos@cadence.com>
To: Heiko Stuebner <heiko@sntech.de>,
Artur Jedrysek <jartur@cadence.com>,
"jbergsagel@ti.com" <jbergsagel@ti.com>
Cc: David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Archit Taneja <architt@codeaurora.org>,
Andrzej Hajda <a.hajda@samsung.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Gustavo Padovan <gustavo@padovan.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Sean Paul <sean@poorly.run>, Sandy Huang <hjc@rock-chips.com>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-rockchip@lists.infradead.org"
<linux-rockchip@lists.infradead.org>,
Piotr Sroka <piotrs@cadence.com>,
Quentin Schulz <quentin.schulz@free-electrons.com>
Subject: RE: [PATCH v4 5/5] drm: bridge: add support for Cadence MHDP DPI/DP bridge
Date: Mon, 24 Sep 2018 12:47:39 +0000 [thread overview]
Message-ID: <CO2PR07MB2551CD9AD02B57D818B7FD23CD170@CO2PR07MB2551.namprd07.prod.outlook.com> (raw)
In-Reply-To: <6154358.J9crsCiUTz@phil>
Heiko,
> Hi Damian,
>
> Am Montag, 24. September 2018, 13:40:03 CEST schrieb Damian Kos:
> > > Am Donnerstag, 20. September 2018, 16:54:40 CEST schrieb Damian Kos:
> > > > From: Quentin Schulz <quentin.schulz@free-electrons.com>
> > > >
> > > > This adds basic support for Cadence MHDP DPI to DP bridge.
> > > >
> > > > Basically, it takes a DPI stream as input and output it encoded in
> > > > DP format. It's missing proper HPD, HDCP and currently supports
> > > > only SST mode.
> > > >
> > > > Changes made in the low level driver (cdn-dp-reg.*):
> > > > - moved it to from drivers/gpu/drm/rockchip to
> > > > drivers/gpu/drm/bridge/cdns-mhdp-common.*
> > > > - functions for sending/receiving commands are now public
> > > > - added functions for reading registers and link training
> > > > adjustment
> > > >
> > > > Changes made in RK's driver (cdn-dp-core.*):
> > > > - Moved audio_info and audio_pdev fields from cdn_dp_device to
> > > > cdns_mhdp_device structure.
> > > >
> > > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
> > > > Signed-off-by: Damian Kos <dkos@cadence.com>
> > >
> > > [...]
> > >
> > > > diff --git a/drivers/gpu/drm/rockchip/Kconfig
> > > > b/drivers/gpu/drm/rockchip/Kconfig
> > > > index 0ccc76217ee4..129b0529f3e1 100644
> > > > --- a/drivers/gpu/drm/rockchip/Kconfig
> > > > +++ b/drivers/gpu/drm/rockchip/Kconfig
> > > > @@ -27,7 +27,9 @@ config ROCKCHIP_ANALOGIX_DP
> > > >
> > > > config ROCKCHIP_CDN_DP
> > > > bool "Rockchip cdn DP"
> > > > - depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
> > > > + depends on DRM_ROCKCHIP=m
> > >
> > > Sorry, I wasn't fast enough in my reply to you mail to catch that before your v4, but I don't think this is necessary.
> > > Instead I do guess, the select below should do the right thing by making EXTCON=y if DRM_ROCKCHIP=y.
> > >
> > > Somewhat clumsily verified by making EXTCON=m in my defconfig and seeing get changed to y upon build, which I guess comes from a different "select" in the config.
> > >
> >
> > I've changed it to:
> >
> > config ROCKCHIP_CDN_DP
> > bool "Rockchip cdn DP"
> > depends on DRM_ROCKCHIP
> > select EXTCON if DRM_ROCKCHIP=y
> > select DRM_CDNS_MHDP
> > help...
> >
> > and it seems that there are no issues. At least for me.
> >
> > Please let me know if that's OK.
>
> nope, just do "select EXTCON" . It works nicely and the above would not select EXTCON at all if the the rockchip-drm driver gets built into the kernel.
That's weird. I'm pretty sure that I've tried that and got circular dependency error, but now it's working fine. Anyway:
config ROCKCHIP_CDN_DP
bool "Rockchip cdn DP"
depends on DRM_ROCKCHIP
select EXTCON
select DRM_CDNS_MHDP
help...
>
> To be sure I just did a little experiment and added:
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 4ad85c046dcd..64e2b096afd8 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -154,4 +154,11 @@ source "drivers/gpu/drm/bridge/ite/Kconfig"
>
> source "drivers/gpu/drm/bridge/synopsys/Kconfig"
>
> +config DRM_TMP1
> + tristate "option to select"
> +
> +config DRM_TMP2
> + tristate "option doing the selecting"
> + select DRM_TMP1
> +
>
> If I select DRM_TMP2=m as module I end up with CONFIG_DRM_TMP1=m CONFIG_DRM_TMP2=m in the defconfig and wit DRM_TMP2=y it changes to CONFIG_DRM_TMP1=y CONFIG_DRM_TMP2=y
>
> so all is well with just doing "select EXTCON" above and will select the correct "m" or "y" stance as needed.
>
>
> Heiko
--
Damian
next prev parent reply other threads:[~2018-09-24 12:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 14:54 [PATCH v4 0/5] drm: add support for Cadence MHDP DPI/DP bridge Damian Kos
2018-09-20 14:54 ` [PATCH v4 1/5] drm/rockchip: prepare common code for cdns and rk dpi/dp driver Damian Kos
2018-09-20 14:54 ` [PATCH v4 2/5] drm/dp: fix link probing for devices supporting DP 1.4+ Damian Kos
2018-09-21 7:59 ` Manasi Navare
2018-10-01 9:27 ` Quentin Schulz
2018-10-02 13:28 ` Ville Syrjälä
2018-09-20 14:54 ` [PATCH v4 3/5] drm/dp: make dp_get_lane_status usable from outside of the core Damian Kos
2018-09-20 14:54 ` [PATCH v4 4/5] dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings Damian Kos
2018-09-20 14:54 ` [PATCH v4 5/5] drm: bridge: add support for Cadence MHDP DPI/DP bridge Damian Kos
2018-09-21 8:41 ` Heiko Stuebner
2018-09-24 11:40 ` Damian Kos
2018-09-24 12:28 ` Heiko Stuebner
2018-09-24 12:47 ` Damian Kos [this message]
2018-09-21 14:01 ` Sean Paul
2018-09-24 10:22 ` Damian Kos
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