drm/sun4i: Implement A83T HDMI driver

A83T has DW HDMI IP block with a custom PHY similar to Synopsys gen2
HDMI PHY.

Only video output was tested, while HW also supports audio and CEC.
Support for them will be added later.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214200906.31509-11-jernej.skrabec@siol.net
This commit is contained in:
Jernej Skrabec 2018-02-14 21:09:04 +01:00 committed by Maxime Ripard
parent 47095e1635
commit b7c7436a5f
No known key found for this signature in database
GPG Key ID: D2B4C094214DAF74
5 changed files with 523 additions and 0 deletions

View File

@ -40,6 +40,15 @@ config DRM_SUN4I_BACKEND
do some alpha blending and feed graphics to TCON. If M is
selected the module will be called sun4i-backend.
config DRM_SUN8I_DW_HDMI
tristate "Support for Allwinner version of DesignWare HDMI"
depends on DRM_SUN4I
select DRM_DW_HDMI
help
Choose this option if you have an Allwinner SoC with the
DesignWare HDMI controller with custom HDMI PHY. If M is
selected the module will be called sun8i_dw_hdmi.
config DRM_SUN8I_MIXER
tristate "Support for Allwinner Display Engine 2.0 Mixer"
default MACH_SUN8I

View File

@ -10,6 +10,9 @@ sun4i-drm-hdmi-y += sun4i_hdmi_enc.o
sun4i-drm-hdmi-y += sun4i_hdmi_i2c.o
sun4i-drm-hdmi-y += sun4i_hdmi_tmds_clk.o
sun8i-drm-hdmi-y += sun8i_dw_hdmi.o
sun8i-drm-hdmi-y += sun8i_hdmi_phy.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
@ -27,4 +30,5 @@ obj-$(CONFIG_DRM_SUN4I) += sun6i_drc.o
obj-$(CONFIG_DRM_SUN4I_BACKEND) += sun4i-backend.o sun4i-frontend.o
obj-$(CONFIG_DRM_SUN4I_HDMI) += sun4i-drm-hdmi.o
obj-$(CONFIG_DRM_SUN8I_DW_HDMI) += sun8i-drm-hdmi.o
obj-$(CONFIG_DRM_SUN8I_MIXER) += sun8i-mixer.o

View File

@ -0,0 +1,196 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
*/
#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/drm_of.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "sun8i_dw_hdmi.h"
static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adj_mode)
{
struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
}
static const struct drm_encoder_helper_funcs
sun8i_dw_hdmi_encoder_helper_funcs = {
.mode_set = sun8i_dw_hdmi_encoder_mode_set,
};
static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static enum drm_mode_status
sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
const struct drm_display_mode *mode)
{
if (mode->clock > 297000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_hdmi_plat_data *plat_data;
struct drm_device *drm = data;
struct device_node *phy_node;
struct drm_encoder *encoder;
struct sun8i_dw_hdmi *hdmi;
int ret;
if (!pdev->dev.of_node)
return -ENODEV;
hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
return -ENOMEM;
plat_data = &hdmi->plat_data;
hdmi->dev = &pdev->dev;
encoder = &hdmi->encoder;
encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
/*
* If we failed to find the CRTC(s) which this encoder is
* supposed to be connected to, it's because the CRTC has
* not been registered yet. Defer probing, and hope that
* the required CRTC is added later.
*/
if (encoder->possible_crtcs == 0)
return -EPROBE_DEFER;
hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
if (IS_ERR(hdmi->rst_ctrl)) {
dev_err(dev, "Could not get ctrl reset control\n");
return PTR_ERR(hdmi->rst_ctrl);
}
hdmi->clk_tmds = devm_clk_get(dev, "tmds");
if (IS_ERR(hdmi->clk_tmds)) {
dev_err(dev, "Couldn't get the tmds clock\n");
return PTR_ERR(hdmi->clk_tmds);
}
ret = reset_control_deassert(hdmi->rst_ctrl);
if (ret) {
dev_err(dev, "Could not deassert ctrl reset control\n");
return ret;
}
ret = clk_prepare_enable(hdmi->clk_tmds);
if (ret) {
dev_err(dev, "Could not enable tmds clock\n");
goto err_assert_ctrl_reset;
}
phy_node = of_parse_phandle(dev->of_node, "phys", 0);
if (!phy_node) {
dev_err(dev, "Can't found PHY phandle\n");
goto err_disable_clk_tmds;
}
ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
of_node_put(phy_node);
if (ret) {
dev_err(dev, "Couldn't get the HDMI PHY\n");
goto err_disable_clk_tmds;
}
drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
sun8i_hdmi_phy_init(hdmi->phy);
plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
plat_data->phy_name = "sun8i_dw_hdmi_phy";
plat_data->phy_data = hdmi->phy;
platform_set_drvdata(pdev, hdmi);
hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
/*
* If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
* which would have called the encoder cleanup. Do it manually.
*/
if (IS_ERR(hdmi->hdmi)) {
ret = PTR_ERR(hdmi->hdmi);
goto cleanup_encoder;
}
return 0;
cleanup_encoder:
drm_encoder_cleanup(encoder);
sun8i_hdmi_phy_remove(hdmi);
err_disable_clk_tmds:
clk_disable_unprepare(hdmi->clk_tmds);
err_assert_ctrl_reset:
reset_control_assert(hdmi->rst_ctrl);
return ret;
}
static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
dw_hdmi_unbind(hdmi->hdmi);
sun8i_hdmi_phy_remove(hdmi);
clk_disable_unprepare(hdmi->clk_tmds);
reset_control_assert(hdmi->rst_ctrl);
}
static const struct component_ops sun8i_dw_hdmi_ops = {
.bind = sun8i_dw_hdmi_bind,
.unbind = sun8i_dw_hdmi_unbind,
};
static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
}
static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
return 0;
}
static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
{ .compatible = "allwinner,sun8i-a83t-dw-hdmi" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
.probe = sun8i_dw_hdmi_probe,
.remove = sun8i_dw_hdmi_remove,
.driver = {
.name = "sun8i-dw-hdmi",
.of_match_table = sun8i_dw_hdmi_dt_ids,
},
};
module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
MODULE_LICENSE("GPL");

View File

@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
*/
#ifndef _SUN8I_DW_HDMI_H_
#define _SUN8I_DW_HDMI_H_
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_encoder.h>
#include <linux/clk.h>
#include <linux/regmap.h>
#include <linux/reset.h>
struct sun8i_hdmi_phy {
struct clk *clk_bus;
struct clk *clk_mod;
struct regmap *regs;
struct reset_control *rst_phy;
};
struct sun8i_dw_hdmi {
struct clk *clk_tmds;
struct device *dev;
struct dw_hdmi *hdmi;
struct drm_encoder encoder;
struct sun8i_hdmi_phy *phy;
struct dw_hdmi_plat_data plat_data;
struct reset_control *rst_ctrl;
};
static inline struct sun8i_dw_hdmi *
encoder_to_sun8i_dw_hdmi(struct drm_encoder *encoder)
{
return container_of(encoder, struct sun8i_dw_hdmi, encoder);
}
int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node);
void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi);
void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void);
#endif /* _SUN8I_DW_HDMI_H_ */

View File

@ -0,0 +1,270 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
*/
#include <linux/of_address.h>
#include "sun8i_dw_hdmi.h"
#define SUN8I_HDMI_PHY_DBG_CTRL_REG 0x0000
#define SUN8I_HDMI_PHY_DBG_CTRL_PX_LOCK BIT(0)
#define SUN8I_HDMI_PHY_DBG_CTRL_POL_MASK GENMASK(15, 8)
#define SUN8I_HDMI_PHY_DBG_CTRL_POL(val) (val << 8)
#define SUN8I_HDMI_PHY_DBG_CTRL_ADDR_MASK GENMASK(23, 16)
#define SUN8I_HDMI_PHY_DBG_CTRL_ADDR(addr) (addr << 16)
#define SUN8I_HDMI_PHY_REXT_CTRL_REG 0x0004
#define SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN BIT(31)
#define SUN8I_HDMI_PHY_READ_EN_REG 0x0010
#define SUN8I_HDMI_PHY_READ_EN_MAGIC 0x54524545
#define SUN8I_HDMI_PHY_UNSCRAMBLE_REG 0x0014
#define SUN8I_HDMI_PHY_UNSCRAMBLE_MAGIC 0x42494E47
/*
* Address can be actually any value. Here is set to same value as
* it is set in BSP driver.
*/
#define I2C_ADDR 0x69
static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
struct drm_display_mode *mode)
{
struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
u32 val = 0;
if ((mode->flags & DRM_MODE_FLAG_NHSYNC) &&
(mode->flags & DRM_MODE_FLAG_NHSYNC)) {
val = 0x03;
}
regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
SUN8I_HDMI_PHY_DBG_CTRL_POL_MASK,
SUN8I_HDMI_PHY_DBG_CTRL_POL(val));
regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_REXT_CTRL_REG,
SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN,
SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN);
/* power down */
dw_hdmi_phy_gen2_txpwron(hdmi, 0);
dw_hdmi_phy_gen2_pddq(hdmi, 1);
dw_hdmi_phy_reset(hdmi);
dw_hdmi_phy_gen2_pddq(hdmi, 0);
dw_hdmi_phy_i2c_set_addr(hdmi, I2C_ADDR);
/*
* Values are taken from BSP HDMI driver. Although AW didn't
* release any documentation, explanation of this values can
* be found in i.MX 6Dual/6Quad Reference Manual.
*/
if (mode->crtc_clock <= 27000) {
dw_hdmi_phy_i2c_write(hdmi, 0x01e0, 0x06);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x15);
dw_hdmi_phy_i2c_write(hdmi, 0x08da, 0x10);
dw_hdmi_phy_i2c_write(hdmi, 0x0007, 0x19);
dw_hdmi_phy_i2c_write(hdmi, 0x0318, 0x0e);
dw_hdmi_phy_i2c_write(hdmi, 0x8009, 0x09);
} else if (mode->crtc_clock <= 74250) {
dw_hdmi_phy_i2c_write(hdmi, 0x0540, 0x06);
dw_hdmi_phy_i2c_write(hdmi, 0x0005, 0x15);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x10);
dw_hdmi_phy_i2c_write(hdmi, 0x0007, 0x19);
dw_hdmi_phy_i2c_write(hdmi, 0x02b5, 0x0e);
dw_hdmi_phy_i2c_write(hdmi, 0x8009, 0x09);
} else if (mode->crtc_clock <= 148500) {
dw_hdmi_phy_i2c_write(hdmi, 0x04a0, 0x06);
dw_hdmi_phy_i2c_write(hdmi, 0x000a, 0x15);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x10);
dw_hdmi_phy_i2c_write(hdmi, 0x0002, 0x19);
dw_hdmi_phy_i2c_write(hdmi, 0x0021, 0x0e);
dw_hdmi_phy_i2c_write(hdmi, 0x8029, 0x09);
} else {
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x06);
dw_hdmi_phy_i2c_write(hdmi, 0x000f, 0x15);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x10);
dw_hdmi_phy_i2c_write(hdmi, 0x0002, 0x19);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x0e);
dw_hdmi_phy_i2c_write(hdmi, 0x802b, 0x09);
}
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x1e);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x13);
dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x17);
dw_hdmi_phy_gen2_txpwron(hdmi, 1);
return 0;
};
static void sun8i_hdmi_phy_disable(struct dw_hdmi *hdmi, void *data)
{
struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
dw_hdmi_phy_gen2_txpwron(hdmi, 0);
dw_hdmi_phy_gen2_pddq(hdmi, 1);
regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_REXT_CTRL_REG,
SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN, 0);
}
static const struct dw_hdmi_phy_ops sun8i_hdmi_phy_ops = {
.init = &sun8i_hdmi_phy_config,
.disable = &sun8i_hdmi_phy_disable,
.read_hpd = &dw_hdmi_phy_read_hpd,
.update_hpd = &dw_hdmi_phy_update_hpd,
.setup_hpd = &dw_hdmi_phy_setup_hpd,
};
void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
{
/* enable read access to HDMI controller */
regmap_write(phy->regs, SUN8I_HDMI_PHY_READ_EN_REG,
SUN8I_HDMI_PHY_READ_EN_MAGIC);
/* unscramble register offsets */
regmap_write(phy->regs, SUN8I_HDMI_PHY_UNSCRAMBLE_REG,
SUN8I_HDMI_PHY_UNSCRAMBLE_MAGIC);
regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
SUN8I_HDMI_PHY_DBG_CTRL_PX_LOCK,
SUN8I_HDMI_PHY_DBG_CTRL_PX_LOCK);
/*
* Set PHY I2C address. It must match to the address set by
* dw_hdmi_phy_set_slave_addr().
*/
regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
SUN8I_HDMI_PHY_DBG_CTRL_ADDR_MASK,
SUN8I_HDMI_PHY_DBG_CTRL_ADDR(I2C_ADDR));
}
const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void)
{
return &sun8i_hdmi_phy_ops;
}
static struct regmap_config sun8i_hdmi_phy_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = SUN8I_HDMI_PHY_UNSCRAMBLE_REG,
.name = "phy"
};
static const struct of_device_id sun8i_hdmi_phy_of_table[] = {
{ .compatible = "allwinner,sun8i-a83t-hdmi-phy" },
{ /* sentinel */ }
};
int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
{
struct device *dev = hdmi->dev;
struct sun8i_hdmi_phy *phy;
struct resource res;
void __iomem *regs;
int ret;
if (!of_match_node(sun8i_hdmi_phy_of_table, node)) {
dev_err(dev, "Incompatible HDMI PHY\n");
return -EINVAL;
}
phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
ret = of_address_to_resource(node, 0, &res);
if (ret) {
dev_err(dev, "phy: Couldn't get our resources\n");
return ret;
}
regs = devm_ioremap_resource(dev, &res);
if (IS_ERR(regs)) {
dev_err(dev, "Couldn't map the HDMI PHY registers\n");
return PTR_ERR(regs);
}
phy->regs = devm_regmap_init_mmio(dev, regs,
&sun8i_hdmi_phy_regmap_config);
if (IS_ERR(phy->regs)) {
dev_err(dev, "Couldn't create the HDMI PHY regmap\n");
return PTR_ERR(phy->regs);
}
phy->clk_bus = of_clk_get_by_name(node, "bus");
if (IS_ERR(phy->clk_bus)) {
dev_err(dev, "Could not get bus clock\n");
return PTR_ERR(phy->clk_bus);
}
phy->clk_mod = of_clk_get_by_name(node, "mod");
if (IS_ERR(phy->clk_mod)) {
dev_err(dev, "Could not get mod clock\n");
ret = PTR_ERR(phy->clk_mod);
goto err_put_clk_bus;
}
phy->rst_phy = of_reset_control_get_shared(node, "phy");
if (IS_ERR(phy->rst_phy)) {
dev_err(dev, "Could not get phy reset control\n");
ret = PTR_ERR(phy->rst_phy);
goto err_put_clk_mod;
}
ret = reset_control_deassert(phy->rst_phy);
if (ret) {
dev_err(dev, "Cannot deassert phy reset control: %d\n", ret);
goto err_put_rst_phy;
}
ret = clk_prepare_enable(phy->clk_bus);
if (ret) {
dev_err(dev, "Cannot enable bus clock: %d\n", ret);
goto err_deassert_rst_phy;
}
ret = clk_prepare_enable(phy->clk_mod);
if (ret) {
dev_err(dev, "Cannot enable mod clock: %d\n", ret);
goto err_disable_clk_bus;
}
hdmi->phy = phy;
return 0;
err_disable_clk_bus:
clk_disable_unprepare(phy->clk_bus);
err_deassert_rst_phy:
reset_control_assert(phy->rst_phy);
err_put_rst_phy:
reset_control_put(phy->rst_phy);
err_put_clk_mod:
clk_put(phy->clk_mod);
err_put_clk_bus:
clk_put(phy->clk_bus);
return ret;
}
void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
{
struct sun8i_hdmi_phy *phy = hdmi->phy;
clk_disable_unprepare(phy->clk_mod);
clk_disable_unprepare(phy->clk_bus);
reset_control_assert(phy->rst_phy);
reset_control_put(phy->rst_phy);
clk_put(phy->clk_mod);
clk_put(phy->clk_bus);
}