diff options
| author | Kuninori Morimoto <morimoto.kuninori@renesas.com> | 2009-10-05 19:48:20 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-05 23:40:27 +0300 |
| commit | b1de7aeba1d7592b97507c21ea986ec6243a4165 (patch) | |
| tree | df1d2e0c3388cc88b36f48a11fd9483de7bba214 | |
| parent | 56f6f5582f7f422f142035dd92b521e72ffdb348 (diff) | |
| download | linux-b1de7aeba1d7592b97507c21ea986ec6243a4165.tar.xz | |
V4L/DVB (13127): sh_mobile_ceu: add soft reset function
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/sh_mobile_ceu_camera.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c index 9c8b7c7b89ee..edb6ec3d2bcd 100644 --- a/drivers/media/video/sh_mobile_ceu_camera.c +++ b/drivers/media/video/sh_mobile_ceu_camera.c @@ -153,6 +153,40 @@ static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs) return ioread32(priv->base + reg_offs); } +static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev) +{ + int i, success = 0; + struct soc_camera_device *icd = pcdev->icd; + + ceu_write(pcdev, CAPSR, 1 << 16); /* reset */ + + /* wait CSTSR.CPTON bit */ + for (i = 0; i < 1000; i++) { + if (!(ceu_read(pcdev, CSTSR) & 1)) { + success++; + break; + } + udelay(1); + } + + /* wait CAPSR.CPKIL bit */ + for (i = 0; i < 1000; i++) { + if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) { + success++; + break; + } + udelay(1); + } + + + if (2 != success) { + dev_warn(&icd->dev, "soft reset time out\n"); + return -EIO; + } + + return 0; +} + /* * Videobuf operations */ @@ -407,13 +441,9 @@ static int sh_mobile_ceu_add_device(struct soc_camera_device *icd) pm_runtime_get_sync(ici->v4l2_dev.dev); - ceu_write(pcdev, CAPSR, 1 << 16); /* reset */ - while (ceu_read(pcdev, CSTSR) & 1) - msleep(1); - pcdev->icd = icd; - return 0; + return sh_mobile_ceu_soft_reset(pcdev); } /* Called with .video_lock held */ @@ -427,7 +457,7 @@ static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd) /* disable capture, disable interrupts */ ceu_write(pcdev, CEIER, 0); - ceu_write(pcdev, CAPSR, 1 << 16); /* reset */ + sh_mobile_ceu_soft_reset(pcdev); /* make sure active buffer is canceled */ spin_lock_irqsave(&pcdev->lock, flags); |