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alistair23-linux/drivers/gpu/drm/sti/sti_hdmi.c
Vladimir Zapolskiy 4d5821a71c drm/sti: hdmi use of_get_i2c_adapter_by_node interface 
This change is needed to properly lock I2C bus device and driver,
which serve DDC lines. Without this change I2C bus driver module
may gone in runtime and this won't be noticed by the driver.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Vincent Abriou <vincent.abriou@st.com>
2015-11-03 13:04:54 +01:00

916 lines
24 KiB
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/*
* 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/hdmi.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include "sti_hdmi.h"
#include "sti_hdmi_tx3g4c28phy.h"
#include "sti_hdmi_tx3g0c55phy.h"
#include "sti_vtg.h"
#define HDMI_CFG 0x0000
#define HDMI_INT_EN 0x0004
#define HDMI_INT_STA 0x0008
#define HDMI_INT_CLR 0x000C
#define HDMI_STA 0x0010
#define HDMI_ACTIVE_VID_XMIN 0x0100
#define HDMI_ACTIVE_VID_XMAX 0x0104
#define HDMI_ACTIVE_VID_YMIN 0x0108
#define HDMI_ACTIVE_VID_YMAX 0x010C
#define HDMI_DFLT_CHL0_DAT 0x0110
#define HDMI_DFLT_CHL1_DAT 0x0114
#define HDMI_DFLT_CHL2_DAT 0x0118
#define HDMI_SW_DI_1_HEAD_WORD 0x0210
#define HDMI_SW_DI_1_PKT_WORD0 0x0214
#define HDMI_SW_DI_1_PKT_WORD1 0x0218
#define HDMI_SW_DI_1_PKT_WORD2 0x021C
#define HDMI_SW_DI_1_PKT_WORD3 0x0220
#define HDMI_SW_DI_1_PKT_WORD4 0x0224
#define HDMI_SW_DI_1_PKT_WORD5 0x0228
#define HDMI_SW_DI_1_PKT_WORD6 0x022C
#define HDMI_SW_DI_CFG 0x0230
#define HDMI_SW_DI_2_HEAD_WORD 0x0600
#define HDMI_SW_DI_2_PKT_WORD0 0x0604
#define HDMI_SW_DI_2_PKT_WORD1 0x0608
#define HDMI_SW_DI_2_PKT_WORD2 0x060C
#define HDMI_SW_DI_2_PKT_WORD3 0x0610
#define HDMI_SW_DI_2_PKT_WORD4 0x0614
#define HDMI_SW_DI_2_PKT_WORD5 0x0618
#define HDMI_SW_DI_2_PKT_WORD6 0x061C
#define HDMI_IFRAME_SLOT_AVI 1
#define HDMI_IFRAME_SLOT_AUDIO 2
#define XCAT(prefix, x, suffix) prefix ## x ## suffix
#define HDMI_SW_DI_N_HEAD_WORD(x) XCAT(HDMI_SW_DI_, x, _HEAD_WORD)
#define HDMI_SW_DI_N_PKT_WORD0(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD0)
#define HDMI_SW_DI_N_PKT_WORD1(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD1)
#define HDMI_SW_DI_N_PKT_WORD2(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD2)
#define HDMI_SW_DI_N_PKT_WORD3(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD3)
#define HDMI_SW_DI_N_PKT_WORD4(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD4)
#define HDMI_SW_DI_N_PKT_WORD5(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD5)
#define HDMI_SW_DI_N_PKT_WORD6(x) XCAT(HDMI_SW_DI_, x, _PKT_WORD6)
#define HDMI_IFRAME_DISABLED 0x0
#define HDMI_IFRAME_SINGLE_SHOT 0x1
#define HDMI_IFRAME_FIELD 0x2
#define HDMI_IFRAME_FRAME 0x3
#define HDMI_IFRAME_MASK 0x3
#define HDMI_IFRAME_CFG_DI_N(x, n) ((x) << ((n-1)*4)) /* n from 1 to 6 */
#define HDMI_CFG_DEVICE_EN BIT(0)
#define HDMI_CFG_HDMI_NOT_DVI BIT(1)
#define HDMI_CFG_HDCP_EN BIT(2)
#define HDMI_CFG_ESS_NOT_OESS BIT(3)
#define HDMI_CFG_H_SYNC_POL_NEG BIT(4)
#define HDMI_CFG_SINK_TERM_DET_EN BIT(5)
#define HDMI_CFG_V_SYNC_POL_NEG BIT(6)
#define HDMI_CFG_422_EN BIT(8)
#define HDMI_CFG_FIFO_OVERRUN_CLR BIT(12)
#define HDMI_CFG_FIFO_UNDERRUN_CLR BIT(13)
#define HDMI_CFG_SW_RST_EN BIT(31)
#define HDMI_INT_GLOBAL BIT(0)
#define HDMI_INT_SW_RST BIT(1)
#define HDMI_INT_PIX_CAP BIT(3)
#define HDMI_INT_HOT_PLUG BIT(4)
#define HDMI_INT_DLL_LCK BIT(5)
#define HDMI_INT_NEW_FRAME BIT(6)
#define HDMI_INT_GENCTRL_PKT BIT(7)
#define HDMI_INT_SINK_TERM_PRESENT BIT(11)
#define HDMI_DEFAULT_INT (HDMI_INT_SINK_TERM_PRESENT \
| HDMI_INT_DLL_LCK \
| HDMI_INT_HOT_PLUG \
| HDMI_INT_GLOBAL)
#define HDMI_WORKING_INT (HDMI_INT_SINK_TERM_PRESENT \
| HDMI_INT_GENCTRL_PKT \
| HDMI_INT_NEW_FRAME \
| HDMI_INT_DLL_LCK \
| HDMI_INT_HOT_PLUG \
| HDMI_INT_PIX_CAP \
| HDMI_INT_SW_RST \
| HDMI_INT_GLOBAL)
#define HDMI_STA_SW_RST BIT(1)
#define HDMI_INFOFRAME_HEADER_TYPE(x) (((x) & 0xff) << 0)
#define HDMI_INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) << 8)
#define HDMI_INFOFRAME_HEADER_LEN(x) (((x) & 0x0f) << 16)
struct sti_hdmi_connector {
struct drm_connector drm_connector;
struct drm_encoder *encoder;
struct sti_hdmi *hdmi;
};
#define to_sti_hdmi_connector(x) \
container_of(x, struct sti_hdmi_connector, drm_connector)
u32 hdmi_read(struct sti_hdmi *hdmi, int offset)
{
return readl(hdmi->regs + offset);
}
void hdmi_write(struct sti_hdmi *hdmi, u32 val, int offset)
{
writel(val, hdmi->regs + offset);
}
/**
* HDMI interrupt handler threaded
*
* @irq: irq number
* @arg: connector structure
*/
static irqreturn_t hdmi_irq_thread(int irq, void *arg)
{
struct sti_hdmi *hdmi = arg;
/* Hot plug/unplug IRQ */
if (hdmi->irq_status & HDMI_INT_HOT_PLUG) {
hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
if (hdmi->drm_dev)
drm_helper_hpd_irq_event(hdmi->drm_dev);
}
/* Sw reset and PLL lock are exclusive so we can use the same
* event to signal them
*/
if (hdmi->irq_status & (HDMI_INT_SW_RST | HDMI_INT_DLL_LCK)) {
hdmi->event_received = true;
wake_up_interruptible(&hdmi->wait_event);
}
return IRQ_HANDLED;
}
/**
* HDMI interrupt handler
*
* @irq: irq number
* @arg: connector structure
*/
static irqreturn_t hdmi_irq(int irq, void *arg)
{
struct sti_hdmi *hdmi = arg;
/* read interrupt status */
hdmi->irq_status = hdmi_read(hdmi, HDMI_INT_STA);
/* clear interrupt status */
hdmi_write(hdmi, hdmi->irq_status, HDMI_INT_CLR);
/* force sync bus write */
hdmi_read(hdmi, HDMI_INT_STA);
return IRQ_WAKE_THREAD;
}
/**
* Set hdmi active area depending on the drm display mode selected
*
* @hdmi: pointer on the hdmi internal structure
*/
static void hdmi_active_area(struct sti_hdmi *hdmi)
{
u32 xmin, xmax;
u32 ymin, ymax;
xmin = sti_vtg_get_pixel_number(hdmi->mode, 1);
xmax = sti_vtg_get_pixel_number(hdmi->mode, hdmi->mode.hdisplay);
ymin = sti_vtg_get_line_number(hdmi->mode, 0);
ymax = sti_vtg_get_line_number(hdmi->mode, hdmi->mode.vdisplay - 1);
hdmi_write(hdmi, xmin, HDMI_ACTIVE_VID_XMIN);
hdmi_write(hdmi, xmax, HDMI_ACTIVE_VID_XMAX);
hdmi_write(hdmi, ymin, HDMI_ACTIVE_VID_YMIN);
hdmi_write(hdmi, ymax, HDMI_ACTIVE_VID_YMAX);
}
/**
* Overall hdmi configuration
*
* @hdmi: pointer on the hdmi internal structure
*/
static void hdmi_config(struct sti_hdmi *hdmi)
{
u32 conf;
DRM_DEBUG_DRIVER("\n");
/* Clear overrun and underrun fifo */
conf = HDMI_CFG_FIFO_OVERRUN_CLR | HDMI_CFG_FIFO_UNDERRUN_CLR;
/* Enable HDMI mode not DVI */
conf |= HDMI_CFG_HDMI_NOT_DVI | HDMI_CFG_ESS_NOT_OESS;
/* Enable sink term detection */
conf |= HDMI_CFG_SINK_TERM_DET_EN;
/* Set Hsync polarity */
if (hdmi->mode.flags & DRM_MODE_FLAG_NHSYNC) {
DRM_DEBUG_DRIVER("H Sync Negative\n");
conf |= HDMI_CFG_H_SYNC_POL_NEG;
}
/* Set Vsync polarity */
if (hdmi->mode.flags & DRM_MODE_FLAG_NVSYNC) {
DRM_DEBUG_DRIVER("V Sync Negative\n");
conf |= HDMI_CFG_V_SYNC_POL_NEG;
}
/* Enable HDMI */
conf |= HDMI_CFG_DEVICE_EN;
hdmi_write(hdmi, conf, HDMI_CFG);
}
/**
* Helper to concatenate infoframe in 32 bits word
*
* @ptr: pointer on the hdmi internal structure
* @data: infoframe to write
* @size: size to write
*/
static inline unsigned int hdmi_infoframe_subpack(const u8 *ptr, size_t size)
{
unsigned long value = 0;
size_t i;
for (i = size; i > 0; i--)
value = (value << 8) | ptr[i - 1];
return value;
}
/**
* Helper to write info frame
*
* @hdmi: pointer on the hdmi internal structure
* @data: infoframe to write
* @size: size to write
*/
static void hdmi_infoframe_write_infopack(struct sti_hdmi *hdmi, const u8 *data)
{
const u8 *ptr = data;
u32 val, slot, mode, i;
u32 head_offset, pack_offset;
size_t size;
switch (*ptr) {
case HDMI_INFOFRAME_TYPE_AVI:
slot = HDMI_IFRAME_SLOT_AVI;
mode = HDMI_IFRAME_FIELD;
head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
size = HDMI_AVI_INFOFRAME_SIZE;
break;
case HDMI_INFOFRAME_TYPE_AUDIO:
slot = HDMI_IFRAME_SLOT_AUDIO;
mode = HDMI_IFRAME_FRAME;
head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
size = HDMI_AUDIO_INFOFRAME_SIZE;
break;
default:
DRM_ERROR("unsupported infoframe type: %#x\n", *ptr);
return;
}
/* Disable transmission slot for updated infoframe */
val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
val = HDMI_INFOFRAME_HEADER_TYPE(*ptr++);
val |= HDMI_INFOFRAME_HEADER_VERSION(*ptr++);
val |= HDMI_INFOFRAME_HEADER_LEN(*ptr++);
writel(val, hdmi->regs + head_offset);
/*
* Each subpack contains 4 bytes
* The First Bytes of the first subpacket must contain the checksum
* Packet size in increase by one.
*/
for (i = 0; i < size; i += sizeof(u32)) {
size_t num;
num = min_t(size_t, size - i, sizeof(u32));
val = hdmi_infoframe_subpack(ptr, num);
ptr += sizeof(u32);
writel(val, hdmi->regs + pack_offset + i);
}
/* Enable transmission slot for updated infoframe */
val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
val |= HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_FIELD, slot);
hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
}
/**
* Prepare and configure the AVI infoframe
*
* AVI infoframe are transmitted at least once per two video field and
* contains information about HDMI transmission mode such as color space,
* colorimetry, ...
*
* @hdmi: pointer on the hdmi internal structure
*
* Return negative value if error occurs
*/
static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
{
struct drm_display_mode *mode = &hdmi->mode;
struct hdmi_avi_infoframe infoframe;
u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
int ret;
DRM_DEBUG_DRIVER("\n");
ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe, mode);
if (ret < 0) {
DRM_ERROR("failed to setup AVI infoframe: %d\n", ret);
return ret;
}
/* fixed infoframe configuration not linked to the mode */
infoframe.colorspace = HDMI_COLORSPACE_RGB;
infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
infoframe.colorimetry = HDMI_COLORIMETRY_NONE;
ret = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
if (ret < 0) {
DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
return ret;
}
hdmi_infoframe_write_infopack(hdmi, buffer);
return 0;
}
/**
* Prepare and configure the AUDIO infoframe
*
* AUDIO infoframe are transmitted once per frame and
* contains information about HDMI transmission mode such as audio codec,
* sample size, ...
*
* @hdmi: pointer on the hdmi internal structure
*
* Return negative value if error occurs
*/
static int hdmi_audio_infoframe_config(struct sti_hdmi *hdmi)
{
struct hdmi_audio_infoframe infofame;
u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
int ret;
ret = hdmi_audio_infoframe_init(&infofame);
if (ret < 0) {
DRM_ERROR("failed to setup audio infoframe: %d\n", ret);
return ret;
}
infofame.channels = 2;
ret = hdmi_audio_infoframe_pack(&infofame, buffer, sizeof(buffer));
if (ret < 0) {
DRM_ERROR("failed to pack audio infoframe: %d\n", ret);
return ret;
}
hdmi_infoframe_write_infopack(hdmi, buffer);
return 0;
}
/**
* Software reset of the hdmi subsystem
*
* @hdmi: pointer on the hdmi internal structure
*
*/
#define HDMI_TIMEOUT_SWRESET 100 /*milliseconds */
static void hdmi_swreset(struct sti_hdmi *hdmi)
{
u32 val;
DRM_DEBUG_DRIVER("\n");
/* Enable hdmi_audio clock only during hdmi reset */
if (clk_prepare_enable(hdmi->clk_audio))
DRM_INFO("Failed to prepare/enable hdmi_audio clk\n");
/* Sw reset */
hdmi->event_received = false;
val = hdmi_read(hdmi, HDMI_CFG);
val |= HDMI_CFG_SW_RST_EN;
hdmi_write(hdmi, val, HDMI_CFG);
/* Wait reset completed */
wait_event_interruptible_timeout(hdmi->wait_event,
hdmi->event_received == true,
msecs_to_jiffies
(HDMI_TIMEOUT_SWRESET));
/*
* HDMI_STA_SW_RST bit is set to '1' when SW_RST bit in HDMI_CFG is
* set to '1' and clk_audio is running.
*/
if ((hdmi_read(hdmi, HDMI_STA) & HDMI_STA_SW_RST) == 0)
DRM_DEBUG_DRIVER("Warning: HDMI sw reset timeout occurs\n");
val = hdmi_read(hdmi, HDMI_CFG);
val &= ~HDMI_CFG_SW_RST_EN;
hdmi_write(hdmi, val, HDMI_CFG);
/* Disable hdmi_audio clock. Not used anymore for drm purpose */
clk_disable_unprepare(hdmi->clk_audio);
}
static void sti_hdmi_disable(struct drm_bridge *bridge)
{
struct sti_hdmi *hdmi = bridge->driver_private;
u32 val = hdmi_read(hdmi, HDMI_CFG);
if (!hdmi->enabled)
return;
DRM_DEBUG_DRIVER("\n");
/* Disable HDMI */
val &= ~HDMI_CFG_DEVICE_EN;
hdmi_write(hdmi, val, HDMI_CFG);
hdmi_write(hdmi, 0xffffffff, HDMI_INT_CLR);
/* Stop the phy */
hdmi->phy_ops->stop(hdmi);
/* Set the default channel data to be a dark red */
hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL0_DAT);
hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL1_DAT);
hdmi_write(hdmi, 0x0060, HDMI_DFLT_CHL2_DAT);
/* Disable/unprepare hdmi clock */
clk_disable_unprepare(hdmi->clk_phy);
clk_disable_unprepare(hdmi->clk_tmds);
clk_disable_unprepare(hdmi->clk_pix);
hdmi->enabled = false;
}
static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
{
struct sti_hdmi *hdmi = bridge->driver_private;
DRM_DEBUG_DRIVER("\n");
if (hdmi->enabled)
return;
/* Prepare/enable clocks */
if (clk_prepare_enable(hdmi->clk_pix))
DRM_ERROR("Failed to prepare/enable hdmi_pix clk\n");
if (clk_prepare_enable(hdmi->clk_tmds))
DRM_ERROR("Failed to prepare/enable hdmi_tmds clk\n");
if (clk_prepare_enable(hdmi->clk_phy))
DRM_ERROR("Failed to prepare/enable hdmi_rejec_pll clk\n");
hdmi->enabled = true;
/* Program hdmi serializer and start phy */
if (!hdmi->phy_ops->start(hdmi)) {
DRM_ERROR("Unable to start hdmi phy\n");
return;
}
/* Program hdmi active area */
hdmi_active_area(hdmi);
/* Enable working interrupts */
hdmi_write(hdmi, HDMI_WORKING_INT, HDMI_INT_EN);
/* Program hdmi config */
hdmi_config(hdmi);
/* Program AVI infoframe */
if (hdmi_avi_infoframe_config(hdmi))
DRM_ERROR("Unable to configure AVI infoframe\n");
/* Program AUDIO infoframe */
if (hdmi_audio_infoframe_config(hdmi))
DRM_ERROR("Unable to configure AUDIO infoframe\n");
/* Sw reset */
hdmi_swreset(hdmi);
}
static void sti_hdmi_set_mode(struct drm_bridge *bridge,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct sti_hdmi *hdmi = bridge->driver_private;
int ret;
DRM_DEBUG_DRIVER("\n");
/* Copy the drm display mode in the connector local structure */
memcpy(&hdmi->mode, mode, sizeof(struct drm_display_mode));
/* Update clock framerate according to the selected mode */
ret = clk_set_rate(hdmi->clk_pix, mode->clock * 1000);
if (ret < 0) {
DRM_ERROR("Cannot set rate (%dHz) for hdmi_pix clk\n",
mode->clock * 1000);
return;
}
ret = clk_set_rate(hdmi->clk_phy, mode->clock * 1000);
if (ret < 0) {
DRM_ERROR("Cannot set rate (%dHz) for hdmi_rejection_pll clk\n",
mode->clock * 1000);
return;
}
}
static void sti_hdmi_bridge_nope(struct drm_bridge *bridge)
{
/* do nothing */
}
static const struct drm_bridge_funcs sti_hdmi_bridge_funcs = {
.pre_enable = sti_hdmi_pre_enable,
.enable = sti_hdmi_bridge_nope,
.disable = sti_hdmi_disable,
.post_disable = sti_hdmi_bridge_nope,
.mode_set = sti_hdmi_set_mode,
};
static int sti_hdmi_connector_get_modes(struct drm_connector *connector)
{
struct sti_hdmi_connector *hdmi_connector
= to_sti_hdmi_connector(connector);
struct sti_hdmi *hdmi = hdmi_connector->hdmi;
struct edid *edid;
int count;
DRM_DEBUG_DRIVER("\n");
edid = drm_get_edid(connector, hdmi->ddc_adapt);
if (!edid)
goto fail;
count = drm_add_edid_modes(connector, edid);
drm_mode_connector_update_edid_property(connector, edid);
kfree(edid);
return count;
fail:
DRM_ERROR("Can't read HDMI EDID\n");
return 0;
}
#define CLK_TOLERANCE_HZ 50
static int sti_hdmi_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_hdmi_connector *hdmi_connector
= to_sti_hdmi_connector(connector);
struct sti_hdmi *hdmi = hdmi_connector->hdmi;
result = clk_round_rate(hdmi->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("hdmi pixclk=%d not supported\n", target);
return MODE_BAD;
}
return MODE_OK;
}
struct drm_encoder *sti_hdmi_best_encoder(struct drm_connector *connector)
{
struct sti_hdmi_connector *hdmi_connector
= to_sti_hdmi_connector(connector);
/* Best encoder is the one associated during connector creation */
return hdmi_connector->encoder;
}
static const
struct drm_connector_helper_funcs sti_hdmi_connector_helper_funcs = {
.get_modes = sti_hdmi_connector_get_modes,
.mode_valid = sti_hdmi_connector_mode_valid,
.best_encoder = sti_hdmi_best_encoder,
};
/* get detection status of display device */
static enum drm_connector_status
sti_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
struct sti_hdmi_connector *hdmi_connector
= to_sti_hdmi_connector(connector);
struct sti_hdmi *hdmi = hdmi_connector->hdmi;
DRM_DEBUG_DRIVER("\n");
if (hdmi->hpd) {
DRM_DEBUG_DRIVER("hdmi cable connected\n");
return connector_status_connected;
}
DRM_DEBUG_DRIVER("hdmi cable disconnected\n");
return connector_status_disconnected;
}
static void sti_hdmi_connector_destroy(struct drm_connector *connector)
{
struct sti_hdmi_connector *hdmi_connector
= to_sti_hdmi_connector(connector);
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
kfree(hdmi_connector);
}
static const struct drm_connector_funcs sti_hdmi_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.fill_modes = drm_helper_probe_single_connector_modes,
.detect = sti_hdmi_connector_detect,
.destroy = sti_hdmi_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_hdmi_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_TMDS)
return encoder;
}
return NULL;
}
static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
{
struct sti_hdmi *hdmi = dev_get_drvdata(dev);
struct drm_device *drm_dev = data;
struct drm_encoder *encoder;
struct sti_hdmi_connector *connector;
struct drm_connector *drm_connector;
struct drm_bridge *bridge;
int err;
/* Set the drm device handle */
hdmi->drm_dev = drm_dev;
encoder = sti_hdmi_find_encoder(drm_dev);
if (!encoder)
return -EINVAL;
connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
if (!connector)
return -EINVAL;
connector->hdmi = hdmi;
bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return -EINVAL;
bridge->driver_private = hdmi;
bridge->funcs = &sti_hdmi_bridge_funcs;
drm_bridge_attach(drm_dev, bridge);
encoder->bridge = bridge;
connector->encoder = encoder;
drm_connector = (struct drm_connector *)connector;
drm_connector->polled = DRM_CONNECTOR_POLL_HPD;
drm_connector_init(drm_dev, drm_connector,
&sti_hdmi_connector_funcs, DRM_MODE_CONNECTOR_HDMIA);
drm_connector_helper_add(drm_connector,
&sti_hdmi_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;
}
/* Enable default interrupts */
hdmi_write(hdmi, HDMI_DEFAULT_INT, HDMI_INT_EN);
return 0;
err_sysfs:
drm_connector_unregister(drm_connector);
err_connector:
drm_connector_cleanup(drm_connector);
return -EINVAL;
}
static void sti_hdmi_unbind(struct device *dev,
struct device *master, void *data)
{
/* do nothing */
}
static const struct component_ops sti_hdmi_ops = {
.bind = sti_hdmi_bind,
.unbind = sti_hdmi_unbind,
};
static const struct of_device_id hdmi_of_match[] = {
{
.compatible = "st,stih416-hdmi",
.data = &tx3g0c55phy_ops,
}, {
.compatible = "st,stih407-hdmi",
.data = &tx3g4c28phy_ops,
}, {
/* end node */
}
};
MODULE_DEVICE_TABLE(of, hdmi_of_match);
static int sti_hdmi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sti_hdmi *hdmi;
struct device_node *np = dev->of_node;
struct resource *res;
struct device_node *ddc;
int ret;
DRM_INFO("%s\n", __func__);
hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
return -ENOMEM;
ddc = of_parse_phandle(pdev->dev.of_node, "ddc", 0);
if (ddc) {
hdmi->ddc_adapt = of_get_i2c_adapter_by_node(ddc);
of_node_put(ddc);
if (!hdmi->ddc_adapt)
return -EPROBE_DEFER;
}
hdmi->dev = pdev->dev;
/* Get resources */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hdmi-reg");
if (!res) {
DRM_ERROR("Invalid hdmi resource\n");
ret = -ENOMEM;
goto release_adapter;
}
hdmi->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
if (!hdmi->regs) {
ret = -ENOMEM;
goto release_adapter;
}
if (of_device_is_compatible(np, "st,stih416-hdmi")) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"syscfg");
if (!res) {
DRM_ERROR("Invalid syscfg resource\n");
ret = -ENOMEM;
goto release_adapter;
}
hdmi->syscfg = devm_ioremap_nocache(dev, res->start,
resource_size(res));
if (!hdmi->syscfg) {
ret = -ENOMEM;
goto release_adapter;
}
}
hdmi->phy_ops = (struct hdmi_phy_ops *)
of_match_node(hdmi_of_match, np)->data;
/* Get clock resources */
hdmi->clk_pix = devm_clk_get(dev, "pix");
if (IS_ERR(hdmi->clk_pix)) {
DRM_ERROR("Cannot get hdmi_pix clock\n");
ret = PTR_ERR(hdmi->clk_pix);
goto release_adapter;
}
hdmi->clk_tmds = devm_clk_get(dev, "tmds");
if (IS_ERR(hdmi->clk_tmds)) {
DRM_ERROR("Cannot get hdmi_tmds clock\n");
ret = PTR_ERR(hdmi->clk_tmds);
goto release_adapter;
}
hdmi->clk_phy = devm_clk_get(dev, "phy");
if (IS_ERR(hdmi->clk_phy)) {
DRM_ERROR("Cannot get hdmi_phy clock\n");
ret = PTR_ERR(hdmi->clk_phy);
goto release_adapter;
}
hdmi->clk_audio = devm_clk_get(dev, "audio");
if (IS_ERR(hdmi->clk_audio)) {
DRM_ERROR("Cannot get hdmi_audio clock\n");
ret = PTR_ERR(hdmi->clk_audio);
goto release_adapter;
}
hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
init_waitqueue_head(&hdmi->wait_event);
hdmi->irq = platform_get_irq_byname(pdev, "irq");
ret = devm_request_threaded_irq(dev, hdmi->irq, hdmi_irq,
hdmi_irq_thread, IRQF_ONESHOT, dev_name(dev), hdmi);
if (ret) {
DRM_ERROR("Failed to register HDMI interrupt\n");
goto release_adapter;
}
hdmi->reset = devm_reset_control_get(dev, "hdmi");
/* Take hdmi out of reset */
if (!IS_ERR(hdmi->reset))
reset_control_deassert(hdmi->reset);
platform_set_drvdata(pdev, hdmi);
return component_add(&pdev->dev, &sti_hdmi_ops);
release_adapter:
i2c_put_adapter(hdmi->ddc_adapt);
return ret;
}
static int sti_hdmi_remove(struct platform_device *pdev)
{
struct sti_hdmi *hdmi = dev_get_drvdata(&pdev->dev);
i2c_put_adapter(hdmi->ddc_adapt);
component_del(&pdev->dev, &sti_hdmi_ops);
return 0;
}
struct platform_driver sti_hdmi_driver = {
.driver = {
.name = "sti-hdmi",
.owner = THIS_MODULE,
.of_match_table = hdmi_of_match,
},
.probe = sti_hdmi_probe,
.remove = sti_hdmi_remove,
};
MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");
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