- 根目录:
- drivers
- gpu
- drm
- sti
- sti_dvo.c
/*
* Copyright (C) STMicroelectronics SA 2014
* Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
* License terms: GNU General Public License (GPL), version 2
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>
#include "sti_awg_utils.h"
#include "sti_mixer.h"
/* DVO registers */
#define DVO_AWG_DIGSYNC_CTRL 0x0000
#define DVO_DOF_CFG 0x0004
#define DVO_LUT_PROG_LOW 0x0008
#define DVO_LUT_PROG_MID 0x000C
#define DVO_LUT_PROG_HIGH 0x0010
#define DVO_DIGSYNC_INSTR_I 0x0100
#define DVO_AWG_CTRL_EN BIT(0)
#define DVO_AWG_FRAME_BASED_SYNC BIT(2)
#define DVO_DOF_EN_LOWBYTE BIT(0)
#define DVO_DOF_EN_MIDBYTE BIT(1)
#define DVO_DOF_EN_HIGHBYTE BIT(2)
#define DVO_DOF_EN BIT(6)
#define DVO_DOF_MOD_COUNT_SHIFT 8
#define DVO_LUT_ZERO 0
#define DVO_LUT_Y_G 1
#define DVO_LUT_Y_G_DEL 2
#define DVO_LUT_CB_B 3
#define DVO_LUT_CB_B_DEL 4
#define DVO_LUT_CR_R 5
#define DVO_LUT_CR_R_DEL 6
#define DVO_LUT_HOLD 7
struct dvo_config {
u32 flags;
u32 lowbyte;
u32 midbyte;
u32 highbyte;
int (*awg_fwgen_fct)(
struct awg_code_generation_params *fw_gen_params,
struct awg_timing *timing);
};
static struct dvo_config rgb_24bit_de_cfg = {
.flags = (0L << DVO_DOF_MOD_COUNT_SHIFT),
.lowbyte = DVO_LUT_CR_R,
.midbyte = DVO_LUT_Y_G,
.highbyte = DVO_LUT_CB_B,
.awg_fwgen_fct = sti_awg_generate_code_data_enable_mode,
};
/**
* STI digital video output structure
*
* @dev: driver device
* @drm_dev: pointer to drm device
* @mode: current display mode selected
* @regs: dvo registers
* @clk_pix: pixel clock for dvo
* @clk: clock for dvo
* @clk_main_parent: dvo parent clock if main path used
* @clk_aux_parent: dvo parent clock if aux path used
* @panel_node: panel node reference from device tree
* @panel: reference to the panel connected to the dvo
* @enabled: true if dvo is enabled else false
* @encoder: drm_encoder it is bound
*/
struct sti_dvo {
struct device dev;
struct drm_device *drm_dev;
struct drm_display_mode mode;
void __iomem *regs;
struct clk *clk_pix;
struct clk *clk;
struct clk *clk_main_parent;
struct clk *clk_aux_parent;
struct device_node *panel_node;
struct drm_panel *panel;
struct dvo_config *config;
bool enabled;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
};
struct sti_dvo_connector {
struct drm_connector drm_connector;
struct drm_encoder *encoder;
struct sti_dvo *dvo;
};
#define to_sti_dvo_connector(x) \
container_of(x, struct sti_dvo_connector, drm_connector)
#define BLANKING_LEVEL 16
int dvo_awg_generate_code(struct sti_dvo *dvo, u8 *ram_size, u32 *ram_code)
{
struct drm_display_mode *mode = &dvo->mode;
struct dvo_config *config = dvo->config;
struct awg_code_generation_params fw_gen_params;
struct awg_timing timing;
fw_gen_params.ram_code = ram_code;
fw_gen_params.instruction_offset = 0;
timing.total_lines = mode->vtotal;
timing.active_lines = mode->vdisplay;
timing.blanking_lines = mode->vsync_start - mode->vdisplay;
timing.trailing_lines = mode->vtotal - mode->vsync_start;
timing.total_pixels = mode->htotal;
timing.active_pixels = mode->hdisplay;
timing.blanking_pixels = mode->hsync_start - mode->hdisplay;
timing.trailing_pixels = mode->htotal - mode->hsync_start;
timing.blanking_level = BLANKING_LEVEL;
if (config->awg_fwgen_fct(&fw_gen_params, &timing)) {
DRM_ERROR("AWG firmware not properly generated\n");
return -EINVAL;
}
*ram_size = fw_gen_params.instruction_offset;
return 0;
}
/* Configure AWG, writing instructions
*
* @dvo: pointer to DVO structure
* @awg_ram_code: pointer to AWG instructions table
* @nb: nb of AWG instructions
*/
static void dvo_awg_configure(struct sti_dvo *dvo, u32 *awg_ram_code, int nb)
{
int i;
DRM_DEBUG_DRIVER("\n");
for (i = 0; i < nb; i++)
writel(awg_ram_code[i],
dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4);
for (i = nb; i < AWG_MAX_INST; i++)
writel(0, dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4);
writel(DVO_AWG_CTRL_EN, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
}
static void sti_dvo_disable(struct drm_bridge *bridge)
{
struct sti_dvo *dvo = bridge->driver_private;
if (!dvo->enabled)
return;
DRM_DEBUG_DRIVER("\n");
if (dvo->config->awg_fwgen_fct)
writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
writel(0x00000000, dvo->regs + DVO_DOF_CFG);
if (dvo->panel)
dvo->panel->funcs->disable(dvo->panel);
/* Disable/unprepare dvo clock */
clk_disable_unprepare(dvo->clk_pix);
clk_disable_unprepare(dvo->clk);
dvo->enabled = false;
}
static void sti_dvo_pre_enable(struct drm_bridge *bridge)
{
struct sti_dvo *dvo = bridge->driver_private;
struct dvo_config *config = dvo->config;
u32 val;
DRM_DEBUG_DRIVER("\n");
if (dvo->enabled)
return;
/* Make sure DVO is disabled */
writel(0x00000000, dvo->regs + DVO_DOF_CFG);
writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
if (config->awg_fwgen_fct) {
u8 nb_instr;
u32 awg_ram_code[AWG_MAX_INST];
/* Configure AWG */
if (!dvo_awg_generate_code(dvo, &nb_instr, awg_ram_code))
dvo_awg_configure(dvo, awg_ram_code, nb_instr);
else
return;
}
/* Prepare/enable clocks */
if (clk_prepare_enable(dvo->clk_pix))
DRM_ERROR("Failed to prepare/enable dvo_pix clk\n");
if (clk_prepare_enable(dvo->clk))
DRM_ERROR("Failed to prepare/enable dvo clk\n");
if (dvo->panel)
dvo->panel->funcs->enable(dvo->panel);
/* Set LUT */
writel(config->lowbyte, dvo->regs + DVO_LUT_PROG_LOW);
writel(config->midbyte, dvo->regs + DVO_LUT_PROG_MID);
writel(config->highbyte, dvo->regs + DVO_LUT_PROG_HIGH);
/* Digital output formatter config */
val = (config->flags | DVO_DOF_EN);
writel(val, dvo->regs + DVO_DOF_CFG);
dvo->enabled = true;
}
static void sti_dvo_set_mode(struct drm_bridge *bridge,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct sti_dvo *dvo = bridge->driver_private;
struct sti_mixer *mixer = to_sti_mixer(dvo->encoder->crtc);
int rate = mode->clock * 1000;
struct clk *clkp;
int ret;
DRM_DEBUG_DRIVER("\n");
memcpy(&dvo->mode, mode, sizeof(struct drm_display_mode));
/* According to the path used (main or aux), the dvo clocks should
* have a different parent clock. */
if (mixer->id == STI_MIXER_MAIN)
clkp = dvo->clk_main_parent;
else
clkp = dvo->clk_aux_parent;
if (clkp) {
clk_set_parent(dvo->clk_pix, clkp);
clk_set_parent(dvo->clk, clkp);
}
/* DVO clocks = compositor clock */
ret = clk_set_rate(dvo->clk_pix, rate);
if (ret < 0) {
DRM_ERROR("Cannot set rate (%dHz) for dvo_pix clk\n", rate);
return;
}
ret = clk_set_rate(dvo->clk, rate);
if (ret < 0) {
DRM_ERROR("Cannot set rate (%dHz) for dvo clk\n", rate);
return;
}
/* For now, we only support 24bit data enable (DE) synchro format */
dvo->config = &rgb_24bit_de_cfg;
}
static void sti_dvo_bridge_nope(struct drm_bridge *bridge)
{
/* do nothing */
}
static const struct drm_bridge_funcs sti_dvo_bridge_funcs = {
.pre_enable = sti_dvo_pre_enable,
.enable = sti_dvo_bridge_nope,
.disable = sti_dvo_disable,
.post_disable = sti_dvo_bridge_nope,
.mode_set = sti_dvo_set_mode,
};
static int sti_dvo_connector_get_modes(struct drm_connector *connector)
{
struct sti_dvo_connector *dvo_connector
= to_sti_dvo_connector(connector);
struct sti_dvo *dvo = dvo_connector->dvo;
if (dvo->panel)
return dvo->panel->funcs->get_modes(dvo->panel);
return 0;
}
#define CLK_TOLERANCE_HZ 50
static int sti_dvo_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
int target = mode->clock * 1000;
int target_min = target - CLK_TOLERANCE_HZ;
int target_max = target + CLK_TOLERANCE_HZ;
int result;
struct sti_dvo_connector *dvo_connector
= to_sti_dvo_connector(connector);
struct sti_dvo *dvo = dvo_connector->dvo;
result = clk_round_rate(dvo->clk_pix, target);
DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n",
target, result);
if ((result < target_min) || (result > target_max)) {
DRM_DEBUG_DRIVER("dvo pixclk=%d not supported\n", target);
return MODE_BAD;
}
return MODE_OK;
}
struct drm_encoder *sti_dvo_best_encoder(struct drm_connector *connector)
{
struct sti_dvo_connector *dvo_connector
= to_sti_dvo_connector(connector);
/* Best encoder is the one associated during connector creation */
return dvo_connector->encoder;
}
static struct drm_connector_helper_funcs sti_dvo_connector_helper_funcs = {
.get_modes = sti_dvo_connector_get_modes,
.mode_valid = sti_dvo_connector_mode_valid,
.best_encoder = sti_dvo_best_encoder,
};
static enum drm_connector_status
sti_dvo_connector_detect(struct drm_connector *connector, bool force)
{
struct sti_dvo_connector *dvo_connector
= to_sti_dvo_connector(connector);
struct sti_dvo *dvo = dvo_connector->dvo;
DRM_DEBUG_DRIVER("\n");
if (!dvo->panel)
dvo->panel = of_drm_find_panel(dvo->panel_node);
if (dvo->panel)
if (!drm_panel_attach(dvo->panel, connector))
return connector_status_connected;
return connector_status_disconnected;
}
static void sti_dvo_connector_destroy(struct drm_connector *connector)
{
struct sti_dvo_connector *dvo_connector
= to_sti_dvo_connector(connector);
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
kfree(dvo_connector);
}
static struct drm_connector_funcs sti_dvo_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.fill_modes = drm_helper_probe_single_connector_modes,
.detect = sti_dvo_connector_detect,
.destroy = sti_dvo_connector_destroy,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static struct drm_encoder *sti_dvo_find_encoder(struct drm_device *dev)
{
struct drm_encoder *encoder;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS)
return encoder;
}
return NULL;
}
static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
{
struct sti_dvo *dvo = dev_get_drvdata(dev);
struct drm_device *drm_dev = data;
struct drm_encoder *encoder;
struct sti_dvo_connector *connector;
struct drm_connector *drm_connector;
struct drm_bridge *bridge;
int err;
/* Set the drm device handle */
dvo->drm_dev = drm_dev;
encoder = sti_dvo_find_encoder(drm_dev);
if (!encoder)
return -ENOMEM;
connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
if (!connector)
return -ENOMEM;
connector->dvo = dvo;
bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return -ENOMEM;
bridge->driver_private = dvo;
bridge->funcs = &sti_dvo_bridge_funcs;
bridge->of_node = dvo->dev.of_node;
err = drm_bridge_add(bridge);
if (err) {
DRM_ERROR("Failed to add bridge\n");
return err;
}
err = drm_bridge_attach(drm_dev, bridge);
if (err) {
DRM_ERROR("Failed to attach bridge\n");
return err;
}
dvo->bridge = bridge;
encoder->bridge = bridge;
connector->encoder = encoder;
dvo->encoder = encoder;
drm_connector = (struct drm_connector *)connector;
drm_connector->polled = DRM_CONNECTOR_POLL_HPD;
drm_connector_init(drm_dev, drm_connector,
&sti_dvo_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
drm_connector_helper_add(drm_connector,
&sti_dvo_connector_helper_funcs);
err = drm_connector_register(drm_connector);
if (err)
goto err_connector;
err = drm_mode_connector_attach_encoder(drm_connector, encoder);
if (err) {
DRM_ERROR("Failed to attach a connector to a encoder\n");
goto err_sysfs;
}
return 0;
err_sysfs:
drm_connector_unregister(drm_connector);
err_connector:
drm_bridge_remove(bridge);
drm_connector_cleanup(drm_connector);
return -EINVAL;
}
static void sti_dvo_unbind(struct device *dev,
struct device *master, void *data)
{
struct sti_dvo *dvo = dev_get_drvdata(dev);
drm_bridge_remove(dvo->bridge);
}
static const struct component_ops sti_dvo_ops = {
.bind = sti_dvo_bind,
.unbind = sti_dvo_unbind,
};
static int sti_dvo_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sti_dvo *dvo;
struct resource *res;
struct device_node *np = dev->of_node;
DRM_INFO("%s\n", __func__);
dvo = devm_kzalloc(dev, sizeof(*dvo), GFP_KERNEL);
if (!dvo) {
DRM_ERROR("Failed to allocate memory for DVO\n");
return -ENOMEM;
}
dvo->dev = pdev->dev;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dvo-reg");
if (!res) {
DRM_ERROR("Invalid dvo resource\n");
return -ENOMEM;
}
dvo->regs = devm_ioremap_nocache(dev, res->start,
resource_size(res));
if (IS_ERR(dvo->regs))
return PTR_ERR(dvo->regs);
dvo->clk_pix = devm_clk_get(dev, "dvo_pix");
if (IS_ERR(dvo->clk_pix)) {
DRM_ERROR("Cannot get dvo_pix clock\n");
return PTR_ERR(dvo->clk_pix);
}
dvo->clk = devm_clk_get(dev, "dvo");
if (IS_ERR(dvo->clk)) {
DRM_ERROR("Cannot get dvo clock\n");
return PTR_ERR(dvo->clk);
}
dvo->clk_main_parent = devm_clk_get(dev, "main_parent");
if (IS_ERR(dvo->clk_main_parent)) {
DRM_DEBUG_DRIVER("Cannot get main_parent clock\n");
dvo->clk_main_parent = NULL;
}
dvo->clk_aux_parent = devm_clk_get(dev, "aux_parent");
if (IS_ERR(dvo->clk_aux_parent)) {
DRM_DEBUG_DRIVER("Cannot get aux_parent clock\n");
dvo->clk_aux_parent = NULL;
}
dvo->panel_node = of_parse_phandle(np, "sti,panel", 0);
if (!dvo->panel_node)
DRM_ERROR("No panel associated to the dvo output\n");
platform_set_drvdata(pdev, dvo);
return component_add(&pdev->dev, &sti_dvo_ops);
}
static int sti_dvo_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sti_dvo_ops);
return 0;
}
static struct of_device_id dvo_of_match[] = {
{ .compatible = "st,stih407-dvo", },
{ /* end node */ }
};
MODULE_DEVICE_TABLE(of, dvo_of_match);
struct platform_driver sti_dvo_driver = {
.driver = {
.name = "sti-dvo",
.owner = THIS_MODULE,
.of_match_table = dvo_of_match,
},
.probe = sti_dvo_probe,
.remove = sti_dvo_remove,
};
module_platform_driver(sti_dvo_driver);
MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");