video: sh_mobile_lcdcfb suspend/resume support
This patch adds suspend/resume support to the LCDC
driver for SuperH Mobile - sh_mobile_lcdcfb.
We simply stop hardware on suspend and start it again
on resume. For RGB panels this is trivial, but for SYS
panels in deferred io mode this becomes a bit more
difficult - we need to wait for a frame end interrupt
to make sure the clocks are balanced before stopping
the actual hardware.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 2c5d069..b433b8a 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -33,6 +33,8 @@
struct fb_info info;
dma_addr_t dma_handle;
struct fb_deferred_io defio;
+ unsigned long frame_end;
+ wait_queue_head_t frame_end_wait;
};
struct sh_mobile_lcdc_priv {
@@ -226,7 +228,10 @@
static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
{
struct sh_mobile_lcdc_priv *priv = data;
+ struct sh_mobile_lcdc_chan *ch;
unsigned long tmp;
+ int is_sub;
+ int k;
/* acknowledge interrupt */
tmp = lcdc_read(priv, _LDINTR);
@@ -234,8 +239,24 @@
tmp |= 0x000000ff ^ LDINTR_FS; /* status in low 8 */
lcdc_write(priv, _LDINTR, tmp);
- /* disable clocks */
- sh_mobile_lcdc_clk_off(priv);
+ /* figure out if this interrupt is for main or sub lcd */
+ is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
+
+ /* wake up channel and disable clocks*/
+ for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
+ ch = &priv->ch[k];
+
+ if (!ch->enabled)
+ continue;
+
+ if (is_sub == lcdc_chan_is_sublcd(ch)) {
+ ch->frame_end = 1;
+ wake_up(&ch->frame_end_wait);
+
+ sh_mobile_lcdc_clk_off(priv);
+ }
+ }
+
return IRQ_HANDLED;
}
@@ -448,18 +469,27 @@
struct sh_mobile_lcdc_board_cfg *board_cfg;
int k;
- /* tell the board code to disable the panel */
+ /* clean up deferred io and ask board code to disable panel */
for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
ch = &priv->ch[k];
+
+ /* deferred io mode:
+ * flush frame, and wait for frame end interrupt
+ * clean up deferred io and enable clock
+ */
+ if (ch->info.fbdefio) {
+ ch->frame_end = 0;
+ schedule_delayed_work(&ch->info.deferred_work, 0);
+ wait_event(ch->frame_end_wait, ch->frame_end);
+ fb_deferred_io_cleanup(&ch->info);
+ ch->info.fbdefio = NULL;
+ sh_mobile_lcdc_clk_on(priv);
+ }
+
board_cfg = &ch->cfg.board_cfg;
if (board_cfg->display_off)
board_cfg->display_off(board_cfg->board_data);
- /* cleanup deferred io if enabled */
- if (ch->info.fbdefio) {
- fb_deferred_io_cleanup(&ch->info);
- ch->info.fbdefio = NULL;
- }
}
/* stop the lcdc */
@@ -652,6 +682,26 @@
return 0;
}
+static int sh_mobile_lcdc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
+ return 0;
+}
+
+static int sh_mobile_lcdc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
+}
+
+static struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
+ .suspend = sh_mobile_lcdc_suspend,
+ .resume = sh_mobile_lcdc_resume,
+};
+
static int sh_mobile_lcdc_remove(struct platform_device *pdev);
static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
@@ -707,6 +757,7 @@
dev_err(&pdev->dev, "unsupported interface type\n");
goto err1;
}
+ init_waitqueue_head(&priv->ch[i].frame_end_wait);
switch (pdata->ch[i].chan) {
case LCDC_CHAN_MAINLCD:
@@ -860,6 +911,7 @@
.driver = {
.name = "sh_mobile_lcdc_fb",
.owner = THIS_MODULE,
+ .pm = &sh_mobile_lcdc_dev_pm_ops,
},
.probe = sh_mobile_lcdc_probe,
.remove = sh_mobile_lcdc_remove,