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Commit 6aa966e6 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Paul Mundt
Browse files

fbdev: sh_mobile_hdmi: cosmetic improvements 



Improve comments, unify function names, replace pr_debug with dev_dbg.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 1c120deb

drivers/video/sh_mobile_hdmi.c

+45 −37
Original line number Diff line number Diff line
@@ -206,7 +206,7 @@ enum hotplug_state { 


struct sh_hdmi {

	void __iomem *base;

	enum hotplug_state hp_state;

	enum hotplug_state hp_state;	/* hot-plug status */

	bool preprogrammed_mode;	/* use a pre-programmed VIC or the external mode */

	struct clk *hdmi_clk;

	struct device *dev;
@@ -227,7 +227,7 @@ static u8 hdmi_read(struct sh_hdmi *hdmi, u8 reg) 
}



/* External video parameter settings */

static void hdmi_external_video_param(struct sh_hdmi *hdmi)

static void sh_hdmi_external_video_param(struct sh_hdmi *hdmi)

{

	struct fb_var_screeninfo *var = &hdmi->var;

	u16 htotal, hblank, hdelay, vtotal, vblank, vdelay, voffset;
@@ -259,7 +259,7 @@ static void hdmi_external_video_param(struct sh_hdmi *hdmi) 
	if (var->sync & FB_SYNC_VERT_HIGH_ACT)

		sync |= 8;



	pr_debug("H: %u, %u, %u, %u; V: %u, %u, %u, %u; sync 0x%x\n",

	dev_dbg(hdmi->dev, "H: %u, %u, %u, %u; V: %u, %u, %u, %u; sync 0x%x\n",

		htotal, hblank, hdelay, var->hsync_len,

		vtotal, vblank, vdelay, var->vsync_len, sync);
@@ -476,9 +476,9 @@ static void sh_hdmi_avi_infoframe_setup(struct sh_hdmi *hdmi) 
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB1);



	/*

	 * C = No Data

	 * M = 16:9 Picture Aspect Ratio

	 * R = Same as picture aspect ratio

	 * [7:6] C = Colorimetry: no data

	 * [5:4] M = 2: 16:9, 1: 4:3 Picture Aspect Ratio

	 * [3:0] R = 8: Active Frame Aspect Ratio: same as picture aspect ratio

	 */

	hdmi_write(hdmi, 0x28, HDMI_CTRL_PKT_BUF_ACCESS_PB2);
@@ -619,7 +619,7 @@ static void sh_hdmi_read_edid(struct sh_hdmi *hdmi) 
	u8 edid[128];



	/* Read EDID */

	pr_debug("Read back EDID code:");

	dev_dbg(hdmi->dev, "Read back EDID code:");

	for (i = 0; i < 128; i++) {

		edid[i] = hdmi_read(hdmi, HDMI_EDID_KSV_FIFO_ACCESS_WINDOW);

#ifdef DEBUG
@@ -635,7 +635,7 @@ static void sh_hdmi_read_edid(struct sh_hdmi *hdmi) 
	printk(KERN_CONT "\n");

#endif

	fb_parse_edid(edid, var);

	pr_debug("%u-%u-%u-%u x %u-%u-%u-%u @ %lu kHz monitor detected\n",

	dev_dbg(hdmi->dev, "%u-%u-%u-%u x %u-%u-%u-%u @ %lu kHz monitor detected\n",

		var->left_margin, var->xres, var->right_margin, var->hsync_len,

		var->upper_margin, var->yres, var->lower_margin, var->vsync_len,

		PICOS2KHZ(var->pixclock));
@@ -647,7 +647,7 @@ static void sh_hdmi_read_edid(struct sh_hdmi *hdmi) 
	else

		hdmi->preprogrammed_mode = false;



	hdmi_external_video_param(hdmi);

	sh_hdmi_external_video_param(hdmi);

}



static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id)
@@ -675,7 +675,7 @@ static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id) 
	hdmi_write(hdmi, 0xFF, HDMI_INTERRUPT_STATUS_2);



	if (printk_ratelimit())

		pr_debug("IRQ #%d: Status #1: 0x%x & 0x%x, #2: 0x%x & 0x%x\n",

		dev_dbg(hdmi->dev, "IRQ #%d: Status #1: 0x%x & 0x%x, #2: 0x%x & 0x%x\n",

			irq, status1, mask1, status2, mask2);



	if (!((status1 & mask1) | (status2 & mask2))) {
@@ -687,7 +687,7 @@ static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id) 
		udelay(500);



		msens = hdmi_read(hdmi, HDMI_HOT_PLUG_MSENS_STATUS);

		pr_debug("MSENS 0x%x\n", msens);

		dev_dbg(hdmi->dev, "MSENS 0x%x\n", msens);

		/* Check, if hot plug & MSENS pin status are both high */

		if ((msens & 0xC0) == 0xC0) {

			/* Display plug in */
@@ -724,7 +724,7 @@ static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id) 
}



/* locking:	called with info->lock held, or before register_framebuffer() */

static void hdmi_display_on(void *arg, struct fb_info *info)

static void sh_hdmi_display_on(void *arg, struct fb_info *info)

{

	/*

	 * info is guaranteed to be valid, when we are called, because our
@@ -734,16 +734,23 @@ static void hdmi_display_on(void *arg, struct fb_info *info) 
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;

	struct sh_mobile_lcdc_chan *ch = info->par;



	pr_debug("%s(%p): state %x\n", __func__, pdata->lcd_dev, info->state);

	dev_dbg(hdmi->dev, "%s(%p): state %x\n", __func__,

		pdata->lcd_dev, info->state);



	/* No need to lock */

	hdmi->info = info;



	/*

	 * hp_state can be set to

	 * HDMI_HOTPLUG_DISCONNECTED:	on monitor unplug

	 * HDMI_HOTPLUG_CONNECTED:	on monitor plug-in

	 * HDMI_HOTPLUG_EDID_DONE:	on EDID read completion

	 */

	switch (hdmi->hp_state) {

	case HDMI_HOTPLUG_EDID_DONE:

		/* PS mode d->e. All functions are active */

		hdmi_write(hdmi, 0x80, HDMI_SYSTEM_CTRL);

		pr_debug("HDMI running\n");

		dev_dbg(hdmi->dev, "HDMI running\n");

		break;

	case HDMI_HOTPLUG_DISCONNECTED:

		info->state = FBINFO_STATE_SUSPENDED;
@@ -753,24 +760,24 @@ static void hdmi_display_on(void *arg, struct fb_info *info) 
}



/* locking: called with info->lock held */

static void hdmi_display_off(void *arg)

static void sh_hdmi_display_off(void *arg)

{

	struct sh_hdmi *hdmi = arg;

	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;



	pr_debug("%s(%p)\n", __func__, pdata->lcd_dev);

	dev_dbg(hdmi->dev, "%s(%p)\n", __func__, pdata->lcd_dev);

	/* PS mode e->a */

	hdmi_write(hdmi, 0x10, HDMI_SYSTEM_CTRL);

}



/* Hotplug interrupt occurred, read EDID */

static void edid_work_fn(struct work_struct *work)

static void sh_hdmi_edid_work_fn(struct work_struct *work)

{

	struct sh_hdmi *hdmi = container_of(work, struct sh_hdmi, edid_work.work);

	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;

	struct sh_mobile_lcdc_chan *ch;



	pr_debug("%s(%p): begin, hotplug status %d\n", __func__,

	dev_dbg(hdmi->dev, "%s(%p): begin, hotplug status %d\n", __func__,

		pdata->lcd_dev, hdmi->hp_state);



	if (!pdata->lcd_dev)
@@ -800,7 +807,7 @@ static void edid_work_fn(struct work_struct *work) 
			fb_set_suspend(hdmi->info, 0);

		} else {

			if (lock_fb_info(hdmi->info)) {

				hdmi_display_on(hdmi, hdmi->info);

				sh_hdmi_display_on(hdmi, hdmi->info);

				unlock_fb_info(hdmi->info);

			}

		}
@@ -822,7 +829,7 @@ static void edid_work_fn(struct work_struct *work) 
out:

	mutex_unlock(&hdmi->mutex);



	pr_debug("%s(%p): end\n", __func__, pdata->lcd_dev);

	dev_dbg(hdmi->dev, "%s(%p): end\n", __func__, pdata->lcd_dev);

}



static int sh_hdmi_notify(struct notifier_block *nb,
@@ -846,18 +853,19 @@ static int sh_hdmi_notify(struct notifier_block *nb, 


	switch(action) {

	case FB_EVENT_FB_REGISTERED:

		/* Unneeded, activation taken care by hdmi_display_on() */

		/* Unneeded, activation taken care by sh_hdmi_display_on() */

		break;

	case FB_EVENT_FB_UNREGISTERED:

		/*

		 * We are called from unregister_framebuffer() with the

		 * info->lock held. This is bad for us, because we can race with

		 * the scheduled work, which has to call fb_set_suspend(), which

		 * takes info->lock internally, so, edid_work_fn() cannot take

		 * and hold info->lock for the whole function duration. Using an

		 * additional lock creates a classical AB-BA lock up. Therefore,

		 * we have to release the info->lock temporarily, synchronise

		 * with the work queue and re-acquire the info->lock.

		 * takes info->lock internally, so, sh_hdmi_edid_work_fn()

		 * cannot take and hold info->lock for the whole function

		 * duration. Using an additional lock creates a classical AB-BA

		 * lock up. Therefore, we have to release the info->lock

		 * temporarily, synchronise with the work queue and re-acquire

		 * the info->lock.

		 */

		unlock_fb_info(hdmi->info);

		mutex_lock(&hdmi->mutex);
@@ -913,7 +921,7 @@ static int __init sh_hdmi_probe(struct platform_device *pdev) 
		goto erate;

	}



	pr_debug("HDMI set frequency %lu\n", rate);

	dev_dbg(hdmi->dev, "HDMI set frequency %lu\n", rate);



	ret = clk_enable(hdmi->hdmi_clk);

	if (ret < 0) {
@@ -948,10 +956,10 @@ static int __init sh_hdmi_probe(struct platform_device *pdev) 
	board_cfg = &pdata->lcd_chan->board_cfg;

	board_cfg->owner = THIS_MODULE;

	board_cfg->board_data = hdmi;

	board_cfg->display_on = hdmi_display_on;

	board_cfg->display_off = hdmi_display_off;

	board_cfg->display_on = sh_hdmi_display_on;

	board_cfg->display_off = sh_hdmi_display_off;



	INIT_DELAYED_WORK(&hdmi->edid_work, edid_work_fn);

	INIT_DELAYED_WORK(&hdmi->edid_work, sh_hdmi_edid_work_fn);



	pm_runtime_enable(&pdev->dev);

	pm_runtime_resume(&pdev->dev);