Re: [linux-sunxi] Re: [PATCH v3 05/24] drm/sun4i: Add TCON TOP driver

From: Chen-Yu Tsai
Date: Fri Jun 29 2018 - 21:13:42 EST

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On Sat, Jun 30, 2018 at 3:09 AM, Jernej Åkrabec <jernej.skrabec@xxxxxxxx> wrote:
> Dne Äetrtek, 28. junij 2018 ob 03:47:20 CEST je Chen-Yu Tsai napisal(a):
>> Hi,
>>
>> So I'm late to the party, but...
>>
>> On Mon, Jun 25, 2018 at 8:02 PM, Jernej Skrabec <jernej.skrabec@xxxxxxxx>
> wrote:
>> > As already described in DT binding, TCON TOP is responsible for
>> > configuring display pipeline. In this initial driver focus is on HDMI
>> > pipeline, so TVE and LCD configuration is not implemented.
>> >
>> > Implemented features:
>> > - HDMI source selection
>> > - clock driver (TCON and DSI gating)
>> > - connecting mixers and TCONS
>> >
>> > Something similar also existed in previous SoCs, except that it was part
>> > of first TCON.
>> >
>> > Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
>> > ---
>> >
>> > drivers/gpu/drm/sun4i/Makefile | 3 +-
>> > drivers/gpu/drm/sun4i/sun8i_tcon_top.c | 300 +++++++++++++++++++++++++
>> > drivers/gpu/drm/sun4i/sun8i_tcon_top.h | 40 ++++
>> > 3 files changed, 342 insertions(+), 1 deletion(-)
>> > create mode 100644 drivers/gpu/drm/sun4i/sun8i_tcon_top.c
>> > create mode 100644 drivers/gpu/drm/sun4i/sun8i_tcon_top.h
>> >
>> > diff --git a/drivers/gpu/drm/sun4i/Makefile
>> > b/drivers/gpu/drm/sun4i/Makefile index 2589f4acd5ae..09fbfd6304ba 100644
>> > --- a/drivers/gpu/drm/sun4i/Makefile
>> > +++ b/drivers/gpu/drm/sun4i/Makefile
>> > @@ -16,7 +16,8 @@ sun8i-drm-hdmi-y += sun8i_hdmi_phy_clk.o
>> >
>> > sun8i-mixer-y += sun8i_mixer.o sun8i_ui_layer.o \
>> >
>> > sun8i_vi_layer.o sun8i_ui_scaler.o \
>> >
>> > - sun8i_vi_scaler.o sun8i_csc.o
>> > + sun8i_vi_scaler.o sun8i_csc.o \
>> > + sun8i_tcon_top.o
>> >
>> > sun4i-tcon-y += sun4i_crtc.o
>> > sun4i-tcon-y += sun4i_dotclock.o
>> >
>> > diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
>> > b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c new file mode 100644
>> > index 000000000000..8da0460e0028
>> > --- /dev/null
>> > +++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
>> > @@ -0,0 +1,300 @@
>> > +// SPDX-License-Identifier: GPL-2.0+
>> > +/* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@xxxxxxxx> */
>> > +
>> > +#include <drm/drmP.h>
>> > +
>> > +#include <dt-bindings/clock/sun8i-tcon-top.h>
>> > +
>> > +#include <linux/bitfield.h>
>> > +#include <linux/component.h>
>> > +#include <linux/device.h>
>> > +#include <linux/module.h>
>> > +#include <linux/of_graph.h>
>> > +#include <linux/platform_device.h>
>> > +
>> > +#include "sun8i_tcon_top.h"
>> > +
>> > +static int sun8i_tcon_top_get_connected_ep_id(struct device_node *node,
>> > + int port_id)
>> > +{
>> > + struct device_node *ep, *remote, *port;
>> > + struct of_endpoint endpoint;
>> > +
>> > + port = of_graph_get_port_by_id(node, port_id);
>> > + if (!port)
>> > + return -ENOENT;
>> > +
>> > + for_each_available_child_of_node(port, ep) {
>> > + remote = of_graph_get_remote_port_parent(ep);
>> > + if (!remote)
>> > + continue;
>> > +
>> > + if (of_device_is_available(remote)) {
>> > + of_graph_parse_endpoint(ep, &endpoint);
>> > +
>> > + of_node_put(remote);
>> > +
>> > + return endpoint.id;
>> > + }
>> > +
>> > + of_node_put(remote);
>> > + }
>> > +
>> > + return -ENOENT;
>> > +}
>> > +
>> > +static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev,
>> > + struct clk *parent,
>> > + void __iomem *regs,
>> > + spinlock_t *lock,
>> > + u8 bit, int name_index)
>> > +{
>> > + const char *clk_name, *parent_name;
>> > + int ret;
>> > +
>> > + parent_name = __clk_get_name(parent);
>>
>> You can simply pass in the binding clock name, and have
>>
>> index = of_property_match_string(np, "clock-names", name);
>> parent_name = of_clk_get_parent_name(dev->of_node, index);
>
> That is elegant solution. Should I include that in follow up series?

If you have time for it, go ahead. This is just cleanup, so there's
no urgency. If not, I suppose I could do it later on.

ChenYu

> Best regards,
> Jernej
>
>>
>> > + ret = of_property_read_string_index(dev->of_node,
>> > + "clock-output-names",
>> > name_index, + &clk_name);
>> > + if (ret)
>> > + return ERR_PTR(ret);
>> > +
>> > + return clk_hw_register_gate(dev, clk_name, parent_name,
>> > + CLK_SET_RATE_PARENT,
>> > + regs + TCON_TOP_GATE_SRC_REG,
>> > + bit, 0, lock);
>> > +};
>> > +
>> > +static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
>> > + void *data)
>> > +{
>> > + struct platform_device *pdev = to_platform_device(dev);
>> > + struct clk *dsi, *tcon_tv0, *tcon_tv1, *tve0, *tve1;
>> > + struct clk_hw_onecell_data *clk_data;
>> > + struct sun8i_tcon_top *tcon_top;
>> > + bool mixer0_unused = false;
>> > + struct resource *res;
>> > + void __iomem *regs;
>> > + int ret, i, id;
>> > + u32 val;
>> > +
>> > + tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL);
>> > + if (!tcon_top)
>> > + return -ENOMEM;
>> > +
>> > + clk_data = devm_kzalloc(dev, sizeof(*clk_data) +
>> > + sizeof(*clk_data->hws) * CLK_NUM,
>> > + GFP_KERNEL);
>> > + if (!clk_data)
>> > + return -ENOMEM;
>> > + tcon_top->clk_data = clk_data;
>> > +
>> > + spin_lock_init(&tcon_top->reg_lock);
>> > +
>> > + tcon_top->rst = devm_reset_control_get(dev, NULL);
>> > + if (IS_ERR(tcon_top->rst)) {
>> > + dev_err(dev, "Couldn't get our reset line\n");
>> > + return PTR_ERR(tcon_top->rst);
>> > + }
>> > +
>> > + tcon_top->bus = devm_clk_get(dev, "bus");
>> > + if (IS_ERR(tcon_top->bus)) {
>> > + dev_err(dev, "Couldn't get the bus clock\n");
>> > + return PTR_ERR(tcon_top->bus);
>> > + }
>> > +
>> > + dsi = devm_clk_get(dev, "dsi");
>> > + if (IS_ERR(dsi)) {
>> > + dev_err(dev, "Couldn't get the dsi clock\n");
>> > + return PTR_ERR(dsi);
>> > + }
>> > +
>> > + tcon_tv0 = devm_clk_get(dev, "tcon-tv0");
>> > + if (IS_ERR(tcon_tv0)) {
>> > + dev_err(dev, "Couldn't get the tcon-tv0 clock\n");
>> > + return PTR_ERR(tcon_tv0);
>> > + }
>> > +
>> > + tcon_tv1 = devm_clk_get(dev, "tcon-tv1");
>> > + if (IS_ERR(tcon_tv1)) {
>> > + dev_err(dev, "Couldn't get the tcon-tv1 clock\n");
>> > + return PTR_ERR(tcon_tv1);
>> > + }
>> > +
>> > + tve0 = devm_clk_get(dev, "tve0");
>> > + if (IS_ERR(tve0)) {
>> > + dev_err(dev, "Couldn't get the tve0 clock\n");
>> > + return PTR_ERR(tve0);
>> > + }
>> > +
>> > + tve1 = devm_clk_get(dev, "tve1");
>> > + if (IS_ERR(tve1)) {
>> > + dev_err(dev, "Couldn't get the tve1 clock\n");
>> > + return PTR_ERR(tve1);
>> > + }
>>
>> So you don't actually have to hold references to the parent clocks.
>>
>> ChenYu
>>
>> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> > + regs = devm_ioremap_resource(dev, res);
>> > + if (IS_ERR(regs))
>> > + return PTR_ERR(regs);
>> > +
>> > + ret = reset_control_deassert(tcon_top->rst);
>> > + if (ret) {
>> > + dev_err(dev, "Could not deassert ctrl reset control\n");
>> > + return ret;
>> > + }
>> > +
>> > + ret = clk_prepare_enable(tcon_top->bus);
>> > + if (ret) {
>> > + dev_err(dev, "Could not enable bus clock\n");
>> > + goto err_assert_reset;
>> > + }
>> > +
>> > + val = 0;
>> > +
>> > + /* check if HDMI mux output is connected */
>> > + if (sun8i_tcon_top_get_connected_ep_id(dev->of_node, 5) >= 0) {
>> > + /* find HDMI input endpoint id, if it is connected at
>> > all*/
>> > + id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 4);
>> > + if (id >= 0)
>> > + val = FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, id + 1);
>> > + else
>> > + DRM_DEBUG_DRIVER("TCON TOP HDMI input is not
>> > connected\n"); + } else {
>> > + DRM_DEBUG_DRIVER("TCON TOP HDMI output is not
>> > connected\n"); + }
>> > +
>> > + writel(val, regs + TCON_TOP_GATE_SRC_REG);
>> > +
>> > + val = 0;
>> > +
>> > + /* process mixer0 mux output */
>> > + id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 1);
>> > + if (id >= 0) {
>> > + val = FIELD_PREP(TCON_TOP_PORT_DE0_MSK, id);
>> > + } else {
>> > + DRM_DEBUG_DRIVER("TCON TOP mixer0 output is not
>> > connected\n"); + mixer0_unused = true;
>> > + }
>> > +
>> > + /* process mixer1 mux output */
>> > + id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 3);
>> > + if (id >= 0) {
>> > + val |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, id);
>> > +
>> > + /*
>> > + * mixer0 mux has priority over mixer1 mux. We have to
>> > + * make sure mixer0 doesn't overtake TCON from mixer1.
>> > + */
>> > + if (mixer0_unused && id == 0)
>> > + val |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, 1);
>> > + } else {
>> > + DRM_DEBUG_DRIVER("TCON TOP mixer1 output is not
>> > connected\n"); + }
>> > +
>> > + writel(val, regs + TCON_TOP_PORT_SEL_REG);
>> > +
>> > + /*
>> > + * TCON TOP has two muxes, which select parent clock for each TCON
>> > TV + * channel clock. Parent could be either TCON TV or TVE clock.
>> > For now + * we leave this fixed to TCON TV, since TVE driver for
>> > R40 is not yet + * implemented. Once it is, graph needs to be
>> > traversed to determine + * if TVE is active on each TCON TV. If it
>> > is, mux should be switched + * to TVE clock parent.
>> > + */
>> > + clk_data->hws[CLK_TCON_TOP_TV0] =
>> > + sun8i_tcon_top_register_gate(dev, tcon_tv0, regs,
>> > + &tcon_top->reg_lock,
>> > + TCON_TOP_TCON_TV0_GATE, 0);
>> > +
>> > + clk_data->hws[CLK_TCON_TOP_TV1] =
>> > + sun8i_tcon_top_register_gate(dev, tcon_tv1, regs,
>> > + &tcon_top->reg_lock,
>> > + TCON_TOP_TCON_TV1_GATE, 1);
>> > +
>> > + clk_data->hws[CLK_TCON_TOP_DSI] =
>> > + sun8i_tcon_top_register_gate(dev, dsi, regs,
>> > + &tcon_top->reg_lock,
>> > + TCON_TOP_TCON_DSI_GATE, 2);
>> > +
>> > + for (i = 0; i < CLK_NUM; i++)
>> > + if (IS_ERR(clk_data->hws[i])) {
>> > + ret = PTR_ERR(clk_data->hws[i]);
>> > + goto err_unregister_gates;
>> > + }
>> > +
>> > + clk_data->num = CLK_NUM;
>> > +
>> > + ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
>> > + clk_data);
>> > + if (ret)
>> > + goto err_unregister_gates;
>> > +
>> > + dev_set_drvdata(dev, tcon_top);
>> > +
>> > + return 0;
>> > +
>> > +err_unregister_gates:
>> > + for (i = 0; i < CLK_NUM; i++)
>> > + if (clk_data->hws[i])
>> > + clk_hw_unregister_gate(clk_data->hws[i]);
>> > + clk_disable_unprepare(tcon_top->bus);
>> > +err_assert_reset:
>> > + reset_control_assert(tcon_top->rst);
>> > +
>> > + return ret;
>> > +}
>> > +
>> > +static void sun8i_tcon_top_unbind(struct device *dev, struct device
>> > *master, + void *data)
>> > +{
>> > + struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
>> > + struct clk_hw_onecell_data *clk_data = tcon_top->clk_data;
>> > + int i;
>> > +
>> > + of_clk_del_provider(dev->of_node);
>> > + for (i = 0; i < CLK_NUM; i++)
>> > + clk_hw_unregister_gate(clk_data->hws[i]);
>> > +
>> > + clk_disable_unprepare(tcon_top->bus);
>> > + reset_control_assert(tcon_top->rst);
>> > +}
>> > +
>> > +static const struct component_ops sun8i_tcon_top_ops = {
>> > + .bind = sun8i_tcon_top_bind,
>> > + .unbind = sun8i_tcon_top_unbind,
>> > +};
>> > +
>> > +static int sun8i_tcon_top_probe(struct platform_device *pdev)
>> > +{
>> > + return component_add(&pdev->dev, &sun8i_tcon_top_ops);
>> > +}
>> > +
>> > +static int sun8i_tcon_top_remove(struct platform_device *pdev)
>> > +{
>> > + component_del(&pdev->dev, &sun8i_tcon_top_ops);
>> > +
>> > + return 0;
>> > +}
>> > +
>> > +/* sun4i_drv uses this list to check if a device node is a TCON TOP */
>> > +const struct of_device_id sun8i_tcon_top_of_table[] = {
>> > + { .compatible = "allwinner,sun8i-r40-tcon-top" },
>> > + { /* sentinel */ }
>> > +};
>> > +MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table);
>> > +EXPORT_SYMBOL(sun8i_tcon_top_of_table);
>> > +
>> > +static struct platform_driver sun8i_tcon_top_platform_driver = {
>> > + .probe = sun8i_tcon_top_probe,
>> > + .remove = sun8i_tcon_top_remove,
>> > + .driver = {
>> > + .name = "sun8i-tcon-top",
>> > + .of_match_table = sun8i_tcon_top_of_table,
>> > + },
>> > +};
>> > +module_platform_driver(sun8i_tcon_top_platform_driver);
>> > +
>> > +MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@xxxxxxxx>");
>> > +MODULE_DESCRIPTION("Allwinner R40 TCON TOP driver");
>> > +MODULE_LICENSE("GPL");
>> > diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.h
>> > b/drivers/gpu/drm/sun4i/sun8i_tcon_top.h new file mode 100644
>> > index 000000000000..39838bbfeaee
>> > --- /dev/null
>> > +++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.h
>> > @@ -0,0 +1,40 @@
>> > +/* SPDX-License-Identifier: GPL-2.0+ */
>> > +/* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@xxxxxxxx> */
>> > +
>> > +#ifndef _SUN8I_TCON_TOP_H_
>> > +#define _SUN8I_TCON_TOP_H_
>> > +
>> > +#include <linux/clk.h>
>> > +#include <linux/clk-provider.h>
>> > +#include <linux/reset.h>
>> > +#include <linux/spinlock.h>
>> > +
>> > +#define TCON_TOP_TCON_TV_SETUP_REG 0x00
>> > +
>> > +#define TCON_TOP_PORT_SEL_REG 0x1C
>> > +#define TCON_TOP_PORT_DE0_MSK GENMASK(1, 0)
>> > +#define TCON_TOP_PORT_DE1_MSK GENMASK(5, 4)
>> > +
>> > +#define TCON_TOP_GATE_SRC_REG 0x20
>> > +#define TCON_TOP_HDMI_SRC_MSK GENMASK(29, 28)
>> > +#define TCON_TOP_TCON_TV1_GATE 24
>> > +#define TCON_TOP_TCON_TV0_GATE 20
>> > +#define TCON_TOP_TCON_DSI_GATE 16
>> > +
>> > +#define CLK_NUM 3
>> > +
>> > +struct sun8i_tcon_top {
>> > + struct clk *bus;
>> > + struct clk_hw_onecell_data *clk_data;
>> > + struct reset_control *rst;
>> > +
>> > + /*
>> > + * spinlock is used to synchronize access to same
>> > + * register where multiple clock gates can be set.
>> > + */
>> > + spinlock_t reg_lock;
>> > +};
>> > +
>> > +extern const struct of_device_id sun8i_tcon_top_of_table[];
>> > +
>> > +#endif /* _SUN8I_TCON_TOP_H_ */
>> > --
>> > 2.18.0
>
>
>
>
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Next message: Benjamin Herrenschmidt: "Re: [RFC PATCH 01/14] devres: Add devm_of_iomap()"
Previous message: Bjorn Helgaas: "Re: [PATCH V4] PCI: move early dump functionality from x86 arch into the common code"
In reply to: Jernej Åkrabec: "Re: [PATCH v3 05/24] drm/sun4i: Add TCON TOP driver"
Next in thread: Jernej Skrabec: "[PATCH v3 07/24] drm/sun4i: Split out code for enumerating endpoints in output port"
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