Re: [PATCH v2 4/8] drm: rockchip/dp: add rockchip platform dp driver
From: Heiko Stübner
Date: Fri Aug 07 2015 - 19:10:00 EST
Hi Yakir,
I think this Rockchip portion is missing a devicetree binding.
You have the ability to power down the actual edp phy by using
grf_edp_iddq_en from GRF_SOC_CON12. This is similar to how the
rk3288 usb-phy gets put into a deeper state. So maybe you could
provide a phy driver (drivers/phy) for this similar to what the
exynos-dp does.
Some more stuff inline. But I guess by no means complete, as I'm
still trying to integrate this into my development-tree.
Am Freitag, 7. August 2015, 05:46:20 schrieb Yakir Yang:
> Rockchip have three clocks for dp controller, we leave pclk_edp
> to analogix_dp driver control, and keep the sclk_edp_24m and
> sclk_edp in platform driver.
>
> Signed-off-by: Yakir Yang <ykk@xxxxxxxxxxxxxx>
> ---
> Changes in v2: None
>
> drivers/gpu/drm/rockchip/Kconfig | 10 +
> drivers/gpu/drm/rockchip/Makefile | 1 +
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 419
> ++++++++++++++++++++++++ 3 files changed, 430 insertions(+)
> create mode 100644 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig
> b/drivers/gpu/drm/rockchip/Kconfig index 35215f6..096ed77 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -25,3 +25,13 @@ config ROCKCHIP_DW_HDMI
> for the Synopsys DesignWare HDMI driver. If you want to
> enable HDMI on RK3288 based SoC, you should selet this
> option.
> +
> +
nit: double blank line
> +config ROCKCHIP_ANALOGIX_DP
> + tristate "Rockchip specific extensions for Analogix DP driver"
> + depends on DRM_ROCKCHIP
> + select DRM_ANALOGIX_DP
> + help
> + This selects support for Rockchip SoC specific extensions
> + for the Analogix Core DP driver. If you want to enable DP
> + on RK3288 based SoC, you should selet this option.
[...]
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c new file mode 100644
> index 0000000..2f86e5e
> --- /dev/null
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -0,0 +1,419 @@
> +/*
> + * Rockchip SoC DP (Display Port) interface driver.
> + *
> + * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd.
> + * Author: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
> + * Yakir Yang <ykk@xxxxxxxxxxxxxx>
> + * Jeff Chen <jeff.chen@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_dp_helper.h>
> +
> +#include <linux/component.h>
> +#include <linux/clk.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +#include <drm/bridge/analogix_dp.h>
> +
> +#include "rockchip_drm_drv.h"
> +#include "rockchip_drm_vop.h"
> +
> +#define encoder_to_dp(c) \
> + container_of(c, struct rockchip_dp_device, encoder)
> +
> +#define plat_data_to_dp(pd) \
> + container_of(pd, struct rockchip_dp_device, plat_data)
> +
> +/* dp grf register offset */
> +#define DP_VOP_SEL 0x025c /* grf_soc_con6 */
> +#define DP_REF_CLK_SEL 0x0274 /* grf_soc_con12 */
> +
> +#define GRF_DP_REF_CLK_SEL_INTER BIT(4)
> +#define DP_SEL_VOP_LIT BIT(5)
> +
> +struct rockchip_dp_device {
> + struct drm_device *drm_dev;
> + struct device *dev;
> + struct drm_encoder encoder;
> + struct drm_display_mode mode;
> +
> + struct clk *clk_dp;
> + struct clk *clk_24m_parent;
this clk_24m_parent does not seem used at all
> + struct clk *clk_24m;
> + struct regmap *grf;
> + struct reset_control *rst;
> +
> + struct analogix_dp_plat_data plat_data;
> +};
> +
[...]
> +static int rockchip_dp_init(struct rockchip_dp_device *dp)
> +{
> + struct device *dev = dp->dev;
> + struct device_node *np = dev->of_node;
> + int ret;
> +
> + dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
> + if (IS_ERR(dp->grf)) {
> + dev_err(dev,
> + "rk3288-dp needs rockchip,grf property\n");
> + return PTR_ERR(dp->grf);
> + }
> +
> + dp->clk_dp = devm_clk_get(dev, "clk_dp");
I've looked at the manual, but couldn't find an actual clock-name
used there. Is it really "clk_dp" or should it just be "dp"?
> + if (IS_ERR(dp->clk_dp)) {
> + dev_err(dev, "cannot get clk_dp\n");
> + return PTR_ERR(dp->clk_dp);
> + }
> +
> + dp->clk_24m = devm_clk_get(dev, "clk_dp_24m");
Same here, maybe "dp_24m".
> + if (IS_ERR(dp->clk_24m)) {
> + dev_err(dev, "cannot get clk_dp_24m\n");
> + return PTR_ERR(dp->clk_24m);
> + }
I think you're missing the pclk here (PCLK_EDP_CTRL) or is this part of
something else?
> +
> + dp->rst = devm_reset_control_get(dev, "dp");
> + if (IS_ERR(dp->rst)) {
> + dev_err(dev, "failed to get reset\n");
> + return PTR_ERR(dp->rst);
> + }
> +
> + ret = rockchip_dp_clk_enable(dp);
> + if (ret < 0) {
> + dev_err(dp->dev, "cannot enable dp clk %d\n", ret);
> + return ret;
> + }
> +
> + ret = rockchip_dp_pre_init(dp);
> + if (ret < 0) {
> + dev_err(dp->dev, "failed to pre init %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
[...]
> +static int rockchip_dp_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *panel_node;
> + struct rockchip_dp_device *dp;
> + struct drm_panel *panel;
> +
> + panel_node = of_parse_phandle(dev->of_node, "rockchip,panel", 0);
> + if (!panel_node) {
> + DRM_ERROR("failed to find rockchip,panel dt node\n");
> + return -ENODEV;
> + }
Personally I would prefer to continue with the of-graph framework to
attach the panel instead of defining a special node. But I'm not
authorative on this. But that way the dts could then look like [0].
I've sucessfully modified the driver currently in use in Chromeos for my
dev-tree and have ported this change over onto your driver [1].
[0] https://github.com/mmind/linux-rockchip/blob/devel/somewhat-stable/arch/arm/boot/dts/rk3288-veyron-edp.dtsi#L76
[1]
---------- 8< -------------
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index e7cf9ab..24e872d 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -20,6 +20,7 @@
#include <linux/component.h>
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
+#include <linux/of_graph.h>
#include <linux/regmap.h>
#include <linux/reset.h>
@@ -335,14 +336,28 @@ static const struct component_ops rockchip_dp_component_ops = {
static int rockchip_dp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct device_node *panel_node;
+ struct device_node *panel_node, *port, *endpoint;
struct rockchip_dp_device *dp;
struct drm_panel *panel;
- panel_node = of_parse_phandle(dev->of_node, "rockchip,panel", 0);
+ port = of_graph_get_port_by_id(dev->of_node, 1);
+ if (!port) {
+ dev_err(dev, "can't find output port\n");
+ return -EINVAL;
+ }
+
+ endpoint = of_get_child_by_name(port, "endpoint");
+ of_node_put(port);
+ if (!endpoint) {
+ dev_err(dev, "no output endpoint found\n");
+ return -EINVAL;
+ }
+
+ panel_node = of_graph_get_remote_port_parent(endpoint);
+ of_node_put(endpoint);
if (!panel_node) {
- DRM_ERROR("failed to find rockchip,panel dt node\n");
- return -ENODEV;
+ dev_err(&pdev->dev, "no output node found\n");
+ return -EINVAL;
}
panel = of_drm_find_panel(panel_node);
---------- 8< -------------
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