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Subject[PATCH 09/11] drm/sun4i: Implement A83T HDMI driver
Date
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>
---
drivers/gpu/drm/sun4i/Kconfig | 9 +
drivers/gpu/drm/sun4i/Makefile | 1 +
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 367 ++++++++++++++++++++++++++++++++++
3 files changed, 377 insertions(+)
create mode 100644 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
index 882d85db9053..7327da3bc94f 100644
--- a/drivers/gpu/drm/sun4i/Kconfig
+++ b/drivers/gpu/drm/sun4i/Kconfig
@@ -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
diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 2b37a6abbb1d..d633d2b816fd 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -26,4 +26,5 @@ obj-$(CONFIG_DRM_SUN4I) += sun6i_drc.o

obj-$(CONFIG_DRM_SUN4I_BACKEND) += sun4i-backend.o
obj-$(CONFIG_DRM_SUN4I_HDMI) += sun4i-drm-hdmi.o
+obj-$(CONFIG_DRM_SUN8I_DW_HDMI) += sun8i_dw_hdmi.o
obj-$(CONFIG_DRM_SUN8I_MIXER) += sun8i-mixer.o
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
new file mode 100644
index 000000000000..462bb81f11ed
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2017 Jernej Skrabec <jernej.skrabec@siol.net>
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include <drm/drm_of.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/bridge/dw_hdmi.h>
+
+#define SUN8I_HDMI_PHY_REG_UNK1 0x0000
+#define SUN8I_HDMI_PHY_REG_POL 0x0001
+#define SUN8I_HDMI_PHY_REG_UNK2 0x0002
+#define SUN8I_HDMI_PHY_REG_UNK3 0x0003
+#define SUN8I_HDMI_PHY_REG_UNK4 0x0007
+
+#define SUN8I_HDMI_PHY_REG_READ_EN 0x0010
+#define SUN8I_HDMI_PHY_REG_READ_EN_MAGIC 0x54524545
+
+#define SUN8I_HDMI_PHY_REG_UNSCRAMBLE 0x0014
+#define SUN8I_HDMI_PHY_REG_UNSCRAMBLE_MAGIC 0x42494E47
+
+#define to_sun8i_dw_hdmi(x) container_of(x, struct sun8i_dw_hdmi, x)
+
+struct sun8i_dw_hdmi {
+ struct clk *clk_ahb;
+ struct clk *clk_sfr;
+ struct clk *clk_tmds;
+ struct device *dev;
+ struct drm_encoder encoder;
+ void __iomem *phy_base;
+ struct dw_hdmi_plat_data plat_data;
+ struct reset_control *rst_ctrl;
+ struct reset_control *rst_phy;
+};
+
+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 = 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 void sun8i_dw_hdmi_init(struct sun8i_dw_hdmi *hdmi)
+{
+ /* enable read access to HDMI controller */
+ writel(SUN8I_HDMI_PHY_REG_READ_EN_MAGIC,
+ hdmi->phy_base + SUN8I_HDMI_PHY_REG_READ_EN);
+
+ /*
+ * HDMI PHY settings are taken as-is from Allwinner BSP code.
+ * There is no documentation.
+ */
+ writeb(0x01, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+ writeb(0x00, hdmi->phy_base + SUN8I_HDMI_PHY_REG_POL);
+ writeb(0x69, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+ writeb(0x00, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+
+ /* unscramble register offsets */
+ writel(SUN8I_HDMI_PHY_REG_UNSCRAMBLE_MAGIC,
+ hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNSCRAMBLE);
+}
+
+static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static int sun8i_dw_hdmi_phy_init(struct dw_hdmi *dw_hdmi, void *data,
+ struct drm_display_mode *mode)
+{
+ struct sun8i_dw_hdmi *hdmi = (struct sun8i_dw_hdmi *)data;
+ u8 val = 0;
+
+ if ((mode->flags & DRM_MODE_FLAG_NHSYNC) &&
+ (mode->flags & DRM_MODE_FLAG_NHSYNC)) {
+ val = 0x03;
+ }
+
+ writeb(0xa0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK4);
+
+ writeb(val, hdmi->phy_base + SUN8I_HDMI_PHY_REG_POL);
+
+ dw_hdmi_phy_gen2_reset(dw_hdmi, 1);
+
+ dw_hdmi_phy_gen2_txpwron(dw_hdmi, 0);
+ dw_hdmi_phy_gen2_pddq(dw_hdmi, 1);
+
+ dw_hdmi_phy_gen2_reset(dw_hdmi, 0);
+ dw_hdmi_phy_gen2_pddq(dw_hdmi, 0);
+
+ dw_hdmi_phy_set_slave_addr(dw_hdmi);
+
+ if (mode->crtc_clock <= 27000) {
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x01e0, 0x06);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x15);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x08da, 0x10);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0007, 0x19);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0318, 0x0e);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x8009, 0x09);
+ } else if (mode->crtc_clock <= 74250) {
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0540, 0x06);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0005, 0x15);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x10);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0007, 0x19);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x02b5, 0x0e);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x8009, 0x09);
+ } else if (mode->crtc_clock <= 148500) {
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x04a0, 0x06);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x000a, 0x15);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x10);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0002, 0x19);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0021, 0x0e);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x8029, 0x09);
+ } else {
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x06);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x000f, 0x15);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x10);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0002, 0x19);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x0e);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x802b, 0x09);
+ }
+
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x1e);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x13);
+ dw_hdmi_phy_i2c_write(dw_hdmi, 0x0000, 0x17);
+
+ dw_hdmi_phy_gen2_txpwron(dw_hdmi, 1);
+
+ return 0;
+};
+
+static void sun8i_dw_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
+{
+ struct sun8i_dw_hdmi *hdmi = (struct sun8i_dw_hdmi *)data;
+
+ dw_hdmi_phy_gen2_txpwron(dw_hdmi, 0);
+ dw_hdmi_phy_gen2_pddq(dw_hdmi, 1);
+
+ writeb(0x20, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK4);
+}
+
+static const struct dw_hdmi_phy_ops sun8i_dw_hdmi_phy_ops = {
+ .init = &sun8i_dw_hdmi_phy_init,
+ .disable = &sun8i_dw_hdmi_phy_disable,
+ .read_hpd = &dw_hdmi_phy_read_hpd,
+ .update_hpd = &dw_hdmi_phy_update_hpd,
+ .setup_hpd = &dw_hdmi_phy_setup_hpd,
+};
+
+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_BAD;
+
+ return MODE_OK;
+}
+
+static void sun8i_dw_hdmi_deinit(const struct dw_hdmi_plat_data *plat_data)
+{
+ struct sun8i_dw_hdmi *hdmi = to_sun8i_dw_hdmi(plat_data);
+
+ clk_disable_unprepare(hdmi->clk_tmds);
+ clk_disable_unprepare(hdmi->clk_sfr);
+ clk_disable_unprepare(hdmi->clk_ahb);
+
+ reset_control_assert(hdmi->rst_phy);
+ reset_control_assert(hdmi->rst_ctrl);
+}
+
+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 drm_encoder *encoder;
+ struct sun8i_dw_hdmi *hdmi;
+ struct resource *res;
+ 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;
+
+ /* resource 0 is the memory region for the core controller */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ hdmi->phy_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(hdmi->phy_base))
+ return PTR_ERR(hdmi->phy_base);
+
+ hdmi->clk_ahb = devm_clk_get(dev, "iahb");
+ if (IS_ERR(hdmi->clk_ahb)) {
+ dev_err(dev, "Could not get iahb clock\n");
+ return PTR_ERR(hdmi->clk_ahb);
+ }
+
+ hdmi->clk_sfr = devm_clk_get(dev, "isfr");
+ if (IS_ERR(hdmi->clk_sfr)) {
+ dev_err(dev, "Could not get isfr clock\n");
+ return PTR_ERR(hdmi->clk_sfr);
+ }
+
+ hdmi->clk_tmds = devm_clk_get(dev, "tmds");
+ if (IS_ERR(hdmi->clk_tmds)) {
+ dev_err(dev, "Could not get tmds clock\n");
+ return PTR_ERR(hdmi->clk_tmds);
+ }
+
+ 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->rst_phy = devm_reset_control_get(dev, "phy");
+ if (IS_ERR(hdmi->rst_phy)) {
+ dev_err(dev, "Could not get phy reset control\n");
+ return PTR_ERR(hdmi->rst_phy);
+ }
+
+ ret = reset_control_deassert(hdmi->rst_ctrl);
+ if (ret) {
+ dev_err(dev, "Could not deassert ctrl reset control\n");
+ return ret;
+ }
+
+ ret = reset_control_deassert(hdmi->rst_phy);
+ if (ret) {
+ dev_err(dev, "Could not deassert phy reset control\n");
+ goto err_assert_ctrl_reset;
+ }
+
+ ret = clk_prepare_enable(hdmi->clk_ahb);
+ if (ret) {
+ dev_err(dev, "Cannot enable ahb clock: %d\n", ret);
+ goto err_assert_phy_reset;
+ }
+
+ ret = clk_prepare_enable(hdmi->clk_sfr);
+ if (ret) {
+ dev_err(dev, "Cannot enable isfr clock: %d\n", ret);
+ goto err_ahb_clk;
+ }
+
+ /* A83T defaults to 1188 MHz, which is a bit high */
+ clk_set_rate(hdmi->clk_tmds, 297000000);
+
+ ret = clk_prepare_enable(hdmi->clk_tmds);
+ if (ret) {
+ dev_err(dev, "Cannot enable tmds clock: %d\n", ret);
+ goto err_sfr_clk;
+ }
+
+ 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_dw_hdmi_init(hdmi);
+
+ plat_data->deinit = &sun8i_dw_hdmi_deinit;
+ plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
+ plat_data->phy_ops = &sun8i_dw_hdmi_phy_ops;
+ plat_data->phy_name = "sun8i_dw_hdmi_phy";
+ plat_data->phy_data = hdmi;
+
+ ret = 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 (ret)
+ goto cleanup_encoder;
+
+ return 0;
+
+cleanup_encoder:
+ drm_encoder_cleanup(encoder);
+ clk_disable_unprepare(hdmi->clk_tmds);
+err_sfr_clk:
+ clk_disable_unprepare(hdmi->clk_sfr);
+err_ahb_clk:
+ clk_disable_unprepare(hdmi->clk_ahb);
+err_assert_phy_reset:
+ reset_control_assert(hdmi->rst_phy);
+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)
+{
+ return dw_hdmi_unbind(dev);
+}
+
+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");
--
2.15.1
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