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Date: Mon, 06 Feb 2017 12:07:52 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Rob Herring <robh@...nel.org>
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>,
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>,
Liviu Dudau <liviu.dudau@....com>,
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 4/5] drm: convert drivers to use
drm_of_find_panel_or_bridge
On Fri, 2017-02-03 at 21:36 -0600, Rob Herring wrote:
> Similar to the previous commit, convert drivers open coding OF graph
> parsing to use drm_of_find_panel_or_bridge instead.
>
> 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/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
> drivers/gpu/drm/bridge/nxp-ptn3460.c | 16 ++---
> drivers/gpu/drm/bridge/parade-ps8622.c | 16 ++---
> drivers/gpu/drm/bridge/tc358767.c | 27 +------
> drivers/gpu/drm/exynos/exynos_dp.c | 35 ++++-----
> drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 49 ++++---------
> drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c | 5 +-
> drivers/gpu/drm/imx/imx-ldb.c | 28 ++------
> drivers/gpu/drm/imx/parallel-display.c | 35 ++-------
> drivers/gpu/drm/mediatek/mtk_dsi.c | 23 ++----
> drivers/gpu/drm/mxsfb/mxsfb_out.c | 36 ++--------
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 26 ++-----
> drivers/gpu/drm/sun4i/sun4i_rgb.c | 17 ++---
> drivers/gpu/drm/sun4i/sun4i_tcon.c | 90 ++----------------------
> 14 files changed, 88 insertions(+), 379 deletions(-)
>
[...]
> diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
> index 516d06490465..e670993906b8 100644
> --- a/drivers/gpu/drm/imx/imx-ldb.c
> +++ b/drivers/gpu/drm/imx/imx-ldb.c
> @@ -649,7 +649,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>
> for_each_child_of_node(np, child) {
> struct imx_ldb_channel *channel;
> - struct device_node *ep;
> + struct device_node *remote;
> int bus_format;
>
> ret = of_property_read_u32(child, "reg", &i);
> @@ -673,27 +673,11 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
> * The output port is port@4 with an external 4-port mux or
> * port@2 with the internal 2-port mux.
> */
> - ep = of_graph_get_endpoint_by_regs(child,
> - imx_ldb->lvds_mux ? 4 : 2,
> - -1);
> - if (ep) {
> - struct device_node *remote;
> -
> - remote = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> - if (remote) {
> - channel->panel = of_drm_find_panel(remote);
> - channel->bridge = of_drm_find_bridge(remote);
> - } else
> - return -EPROBE_DEFER;
> - of_node_put(remote);
> -
> - if (!channel->panel && !channel->bridge) {
> - dev_err(dev, "panel/bridge not found: %s\n",
> - remote->full_name);
> - return -EPROBE_DEFER;
> - }
> - }
> + ret = drm_of_find_panel_or_bridge(fsl_dev->np,
s/fsl_dev->np/child/
> + imx_ldb->lvds_mux ? 4 : 2, 0,
Same comment as for the mediatek changes, this now requires that the
endpoints have no reg property set or reg = <0>. This is fine for LVDS
links, and I am not aware of any device trees that set the reg propertiy
in their LVDS output endpoints, so that should be fine.
> + &channel->panel, &channel->bridge);
> + if (ret)
> + return ret;
>
> /* panel ddc only if there is no bridge */
> if (!channel->bridge) {
> diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
> index 8582a83c0d9b..eb3a0201853a 100644
> --- a/drivers/gpu/drm/imx/parallel-display.c
> +++ b/drivers/gpu/drm/imx/parallel-display.c
> @@ -210,7 +210,7 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
> {
> struct drm_device *drm = data;
> struct device_node *np = dev->of_node;
> - struct device_node *ep;
> + struct device_node *remote;
> const u8 *edidp;
> struct imx_parallel_display *imxpd;
> int ret;
> @@ -239,36 +239,9 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
> imxpd->bus_format = bus_format;
>
> /* port@1 is the output port */
> - ep = of_graph_get_endpoint_by_regs(np, 1, -1);
> - if (ep) {
> - struct device_node *remote;
> -
> - remote = of_graph_get_remote_port_parent(ep);
> - if (!remote) {
> - dev_warn(dev, "endpoint %s not connected\n",
> - ep->full_name);
> - of_node_put(ep);
> - return -ENODEV;
> - }
> - of_node_put(ep);
> -
> - imxpd->panel = of_drm_find_panel(remote);
> - if (imxpd->panel) {
> - dev_dbg(dev, "found panel %s\n", remote->full_name);
> - } else {
> - imxpd->bridge = of_drm_find_bridge(remote);
> - if (imxpd->bridge)
> - dev_dbg(dev, "found bridge %s\n",
> - remote->full_name);
> - }
> - if (!imxpd->panel && !imxpd->bridge) {
> - dev_dbg(dev, "waiting for panel or bridge %s\n",
> - remote->full_name);
> - of_node_put(remote);
> - return -EPROBE_DEFER;
> - }
> - of_node_put(remote);
> - }
> + ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
> + if (ret)
> + return ret;
>
> imxpd->dev = dev;
The parallel-display change looks good to me.
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 2c42f90809d8..14140579f8d4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -16,11 +16,11 @@
> #include <drm/drm_crtc_helper.h>
> #include <drm/drm_mipi_dsi.h>
> #include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
> #include <linux/clk.h>
> #include <linux/component.h>
> #include <linux/of.h>
> #include <linux/of_platform.h>
> -#include <linux/of_graph.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> #include <video/videomode.h>
> @@ -819,7 +819,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> {
> struct mtk_dsi *dsi;
> struct device *dev = &pdev->dev;
> - struct device_node *remote_node, *endpoint;
> struct resource *regs;
> int comp_id;
> int ret;
> @@ -831,22 +830,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> dsi->host.ops = &mtk_dsi_ops;
> dsi->host.dev = dev;
>
> - endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> - if (endpoint) {
> - remote_node = of_graph_get_remote_port_parent(endpoint);
> - if (!remote_node) {
> - dev_err(dev, "No panel connected\n");
> - return -ENODEV;
> - }
> -
> - dsi->bridge = of_drm_find_bridge(remote_node);
> - dsi->panel = of_drm_find_panel(remote_node);
> - of_node_put(remote_node);
> - if (!dsi->bridge && !dsi->panel) {
> - dev_info(dev, "Waiting for bridge or panel driver\n");
> - return -EPROBE_DEFER;
> - }
> - }
> + ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> + &dsi->panel, &dsi->bridge);
> + if (ret)
> + return ret;
Looks fine and also fixes a missing of_node_put on the endpoint node.
regards
Philipp
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