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Date: Mon, 6 Feb 2017 11:09:49 -0600
From: Rob Herring <robh@...nel.org>
To: Liviu Dudau <liviu.dudau@....com>
Cc: David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel.vetter@...el.com>,
Sean Paul <seanpaul@...omium.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Frank Rowand <frowand.list@...il.com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Archit Taneja <architt@...eaurora.org>,
Jingoo Han <jingoohan1@...il.com>,
Inki Dae <inki.dae@...sung.com>,
Joonyoung Shim <jy0922.shim@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Javier Martinez Canillas <javier@....samsung.com>,
Stefan Agner <stefan@...er.ch>,
Alison Wang <alison.wang@...escale.com>,
Xinliang Liu <z.liuxinliang@...ilicon.com>,
Rongrong Zou <zourongrong@...il.com>,
Xinwei Kong <kong.kongxinwei@...ilicon.com>,
Chen Feng <puck.chen@...ilicon.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
CK Hu <ck.hu@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Marek Vasut <marex@...x.de>,
Mark Yao <mark.yao@...k-chips.com>,
Heiko Stuebner <heiko@...ech.de>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Chen-Yu Tsai <wens@...e.org>,
Mali DP Maintainers <malidp@...s.arm.com>,
Neil Armstrong <narmstrong@...libre.com>,
Carlo Caione <carlo@...one.org>,
Kevin Hilman <khilman@...libre.com>,
Rob Clark <robdclark@...il.com>, Jyri Sarha <jsarha@...com>,
Tomi Valkeinen <tomi.valkeinen@...com>,
Eric Anholt <eric@...olt.net>,
Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH 3/5] drm: convert drivers to use of_graph_get_remote_node
On Mon, Feb 06, 2017 at 10:29:33AM +0000, Liviu Dudau wrote:
> On Fri, Feb 03, 2017 at 09:36:33PM -0600, Rob Herring wrote:
> > Convert drivers to use the new of_graph_get_remote_node() helper
> > instead of parsing the endpoint node and then getting the remote device
> > node. Now drivers can just specify the device node and which
> > port/endpoint and get back the connected remote device node. The details
> > of the graph binding are nicely abstracted into the core OF graph code.
> >
> > This changes some error messages to debug messages (in the graph core).
> > Graph connections are often "no connects" depending on the particular
> > board, so we want to avoid spurious messages. Plus the kernel is not a
> > DT validator.
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> > drivers/gpu/drm/arm/hdlcd_drv.c | 22 ++-------
> > drivers/gpu/drm/arm/malidp_drv.c | 29 ++---------
> > drivers/gpu/drm/bridge/adv7511/adv7533.c | 12 +----
> > drivers/gpu/drm/bridge/dumb-vga-dac.c | 15 ++----
> > drivers/gpu/drm/bridge/ti-tfp410.c | 15 ++----
> > drivers/gpu/drm/exynos/exynos_drm_dpi.c | 16 +-----
> > drivers/gpu/drm/exynos/exynos_drm_dsi.c | 13 ++---
> > drivers/gpu/drm/exynos/exynos_drm_mic.c | 27 +---------
> > drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c | 26 ++--------
> > drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
> > drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++---
> > drivers/gpu/drm/mediatek/mtk_hdmi.c | 26 ++--------
> > drivers/gpu/drm/meson/meson_drv.c | 12 ++---
> > drivers/gpu/drm/meson/meson_venc_cvbs.c | 19 ++-----
> > drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +-
> > drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 28 +----------
> > drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 18 +++----
> > drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 11 +----
> > drivers/gpu/drm/tilcdc/tilcdc_external.c | 66 +++----------------------
> > drivers/gpu/drm/vc4/vc4_dpi.c | 15 ++----
> > 20 files changed, 64 insertions(+), 351 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> > index e5f4f4a6546d..0f70f5fe9970 100644
> > --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> > +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> > @@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)
> >
> > static int hdlcd_probe(struct platform_device *pdev)
> > {
> > - struct device_node *port, *ep;
> > + struct device_node *port;
> > struct component_match *match = NULL;
> >
> > - if (!pdev->dev.of_node)
> > - return -ENODEV;
> > -
> > /* there is only one output port inside each device, find it */
> > - ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> > - if (!ep)
> > - return -ENODEV;
> > -
> > - if (!of_device_is_available(ep)) {
> > - of_node_put(ep);
> > + port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> > + if (!port)
> > return -ENODEV;
> > - }
> > -
> > - /* add the remote encoder port as component */
> > - port = of_graph_get_remote_port_parent(ep);
> > - of_node_put(ep);
> > - if (!port || !of_device_is_available(port)) {
> > - of_node_put(port);
> > - return -EAGAIN;
>
> The HDLCD change looks reasonable except for this -EAGAIN business. I'll have to
> test your changes on my setup to see how this affects having the encoder as a module.
What are you expecting to happen with -EAGAIN? This one was a bit of an
oddball.
This condition would only change if you had an overlay. That's a use
case that needs to be handled in a common way ('cause I don't want to
clean-up every driver doing overlays in their own way latter). Just
having "status" changing at runtime would have all sorts of implications
in the kernel.
>
> > - }
> >
> > drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
> > of_node_put(port);
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index 32f746e31379..bfa04be7f5de 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
> > {
> > struct resource *res;
> > struct drm_device *drm;
> > - struct device_node *ep;
> > struct malidp_drm *malidp;
> > struct malidp_hw_device *hwdev;
> > struct platform_device *pdev = to_platform_device(dev);
> > @@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
> > goto init_fail;
> >
> > /* Set the CRTC's port so that the encoder component can find it */
> > - ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> > - if (!ep) {
> > - ret = -EINVAL;
> > - goto port_fail;
> > - }
> > - malidp->crtc.port = of_get_next_parent(ep);
> > + malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
> >
> > ret = component_bind_all(dev, drm);
> > if (ret) {
> > @@ -418,9 +412,7 @@ static int malidp_bind(struct device *dev)
> > irq_init_fail:
> > component_unbind_all(dev, drm);
> > bind_fail:
> > - of_node_put(malidp->crtc.port);
>
> Why removing this line? AFAICT this is still needed, according to of_graph_get_port_by_id()
> documentation.
Yes, you are right.
Rob
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