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fbdev: sh_mobile_hdmi: add support for E-EDID parsing 

Many HDMI clients implement enhanced EDID blocks, which often contain
additional supported video modes. This patch implements parsing of such
E-EDID blocks.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Guennadi Liakhovetski 2010-11-11 14:45:09 +00:00 committed by Paul Mundt
parent d8d776f3fb
commit 4232f60791
1 changed files with 49 additions and 11 deletions
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60
drivers/video/sh_mobile_hdmi.c
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@ -211,6 +211,9 @@ struct sh_hdmi {
enum hotplug_state hp_state; /* hot-plug status */
u8 preprogrammed_vic; /* use a pre-programmed VIC or
the external mode */
u8 edid_block_addr;
u8 edid_segment_nr;
u8 edid_blocks;
struct clk *hdmi_clk;
struct device *dev;
struct fb_info *info;
@ -756,7 +759,38 @@ static int sh_hdmi_read_edid(struct sh_hdmi *hdmi, unsigned long *hdmi_rate,
printk(KERN_CONT "\n");
#endif
fb_edid_to_monspecs(edid, &hdmi->monspec);
if (!hdmi->edid_blocks) {
fb_edid_to_monspecs(edid, &hdmi->monspec);
hdmi->edid_blocks = edid[126] + 1;
dev_dbg(hdmi->dev, "%d main modes, %d extension blocks\n",
hdmi->monspec.modedb_len, hdmi->edid_blocks - 1);
} else {
dev_dbg(hdmi->dev, "Extension %u detected, DTD start %u\n",
edid[0], edid[2]);
fb_edid_add_monspecs(edid, &hdmi->monspec);
}
if (hdmi->edid_blocks > hdmi->edid_segment_nr * 2 +
(hdmi->edid_block_addr >> 7) + 1) {
/* More blocks to read */
if (hdmi->edid_block_addr) {
hdmi->edid_block_addr = 0;
hdmi->edid_segment_nr++;
} else {
hdmi->edid_block_addr = 0x80;
}
/* Set EDID word address */
hdmi_write(hdmi, hdmi->edid_block_addr, HDMI_EDID_WORD_ADDRESS);
/* Enable EDID interrupt */
hdmi_write(hdmi, 0xC6, HDMI_INTERRUPT_MASK_1);
/* Set EDID segment pointer - starts reading EDID */
hdmi_write(hdmi, hdmi->edid_segment_nr, HDMI_EDID_SEGMENT_POINTER);
return -EAGAIN;
}
/* All E-EDID blocks ready */
dev_dbg(hdmi->dev, "%d main and extended modes\n", hdmi->monspec.modedb_len);
fb_get_options("sh_mobile_lcdc", &forced);
if (forced && *forced) {
@ -903,32 +937,34 @@ static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id)
/* Check, if hot plug & MSENS pin status are both high */
if ((msens & 0xC0) == 0xC0) {
/* Display plug in */
hdmi->edid_segment_nr = 0;
hdmi->edid_block_addr = 0;
hdmi->edid_blocks = 0;
hdmi->hp_state = HDMI_HOTPLUG_CONNECTED;
/* Set EDID word address */
hdmi_write(hdmi, 0x00, HDMI_EDID_WORD_ADDRESS);
/* Set EDID segment pointer */
hdmi_write(hdmi, 0x00, HDMI_EDID_SEGMENT_POINTER);
/* Enable EDID interrupt */
hdmi_write(hdmi, 0xC6, HDMI_INTERRUPT_MASK_1);
/* Set EDID segment pointer - starts reading EDID */
hdmi_write(hdmi, 0x00, HDMI_EDID_SEGMENT_POINTER);
} else if (!(status1 & 0x80)) {
/* Display unplug, beware multiple interrupts */
if (hdmi->hp_state != HDMI_HOTPLUG_DISCONNECTED)
if (hdmi->hp_state != HDMI_HOTPLUG_DISCONNECTED) {
hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED;
schedule_delayed_work(&hdmi->edid_work, 0);
hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED;
}
/* display_off will switch back to mode_a */
}
} else if (status1 & 2) {
/* EDID error interrupt: retry */
/* Set EDID word address */
hdmi_write(hdmi, 0x00, HDMI_EDID_WORD_ADDRESS);
hdmi_write(hdmi, hdmi->edid_block_addr, HDMI_EDID_WORD_ADDRESS);
/* Set EDID segment pointer */
hdmi_write(hdmi, 0x00, HDMI_EDID_SEGMENT_POINTER);
hdmi_write(hdmi, hdmi->edid_segment_nr, HDMI_EDID_SEGMENT_POINTER);
} else if (status1 & 4) {
/* Disable EDID interrupt */
hdmi_write(hdmi, 0xC0, HDMI_INTERRUPT_MASK_1);
hdmi->hp_state = HDMI_HOTPLUG_EDID_DONE;
schedule_delayed_work(&hdmi->edid_work, msecs_to_jiffies(10));
}
@ -1056,7 +1092,7 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work)
mutex_lock(&hdmi->mutex);
if (hdmi->hp_state == HDMI_HOTPLUG_EDID_DONE) {
if (hdmi->hp_state == HDMI_HOTPLUG_CONNECTED) {
unsigned long parent_rate = 0, hdmi_rate;
/* A device has been plugged in */
@ -1066,6 +1102,8 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work)
if (ret < 0)
goto out;
hdmi->hp_state = HDMI_HOTPLUG_EDID_DONE;
/* Reconfigure the clock */
ret = sh_hdmi_clk_configure(hdmi, hdmi_rate, parent_rate);
if (ret < 0)
@ -1119,7 +1157,7 @@ static void sh_hdmi_edid_work_fn(struct work_struct *work)
}
out:
if (ret < 0)
if (ret < 0 && ret != -EAGAIN)
hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED;
mutex_unlock(&hdmi->mutex);