diff options
| -rw-r--r-- | drivers/media/video/sh_mobile_ceu_camera.c | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c index edb6ec3d2bcd..a4f3472d4db8 100644 --- a/drivers/media/video/sh_mobile_ceu_camera.c +++ b/drivers/media/video/sh_mobile_ceu_camera.c @@ -236,26 +236,45 @@ static void free_buffer(struct videobuf_queue *vq, #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */ #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */ #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */ +#define CEU_CEIER_VBP (1 << 20) /* vbp error */ #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */ +#define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP) -static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev) +/* + * return value doesn't reflex the success/failure to queue the new buffer, + * but rather the status of the previous buffer. + */ +static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev) { struct soc_camera_device *icd = pcdev->icd; dma_addr_t phys_addr_top, phys_addr_bottom; + u32 status; + int ret = 0; /* The hardware is _very_ picky about this sequence. Especially * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge * several not-so-well documented interrupt sources in CETCR. */ - ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_CPEIE); - ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & CEU_CETCR_MAGIC); - ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_CPEIE); + ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK); + status = ceu_read(pcdev, CETCR); + ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC); + ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK); ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP); ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW); + /* + * When a VBP interrupt occurs, a capture end interrupt does not occur + * and the image of that frame is not captured correctly. So, soft reset + * is needed here. + */ + if (status & CEU_CEIER_VBP) { + sh_mobile_ceu_soft_reset(pcdev); + ret = -EIO; + } + if (!pcdev->active) - return; + return ret; phys_addr_top = videobuf_to_dma_contig(pcdev->active); ceu_write(pcdev, CDAYR, phys_addr_top); @@ -281,6 +300,8 @@ static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev) pcdev->active->state = VIDEOBUF_ACTIVE; ceu_write(pcdev, CAPSR, 0x1); /* start capture */ + + return ret; } static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq, @@ -353,6 +374,11 @@ static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq, list_add_tail(&vb->queue, &pcdev->capture); if (!pcdev->active) { + /* + * Because there were no active buffer at this moment, + * we are not interested in the return value of + * sh_mobile_ceu_capture here. + */ pcdev->active = vb; sh_mobile_ceu_capture(pcdev); } @@ -413,9 +439,8 @@ static irqreturn_t sh_mobile_ceu_irq(int irq, void *data) else pcdev->active = NULL; - sh_mobile_ceu_capture(pcdev); - - vb->state = VIDEOBUF_DONE; + vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ? + VIDEOBUF_ERROR : VIDEOBUF_DONE; do_gettimeofday(&vb->ts); vb->field_count++; wake_up(&vb->done); |
