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V4L/DVB (5466): Fix up some Cafe CCIC delay issues 

Fix up unsociable Cafe CCIC delays.

The Cafe CCIC driver contains some lengthy delays, some of which are 
unnecessary and some of which are done under lock.  Some were marked
with comments, but the comments somehow failed to make the issue go
away.  So fix it for real.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Jonathan Corbet 2007-04-27 12:32:28 -03:00 committed by Mauro Carvalho Chehab
parent 76f4a12000
commit 5b50ed7ca2
1 changed files with 13 additions and 6 deletions
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19
drivers/media/video/cafe_ccic.c
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@ -705,7 +705,13 @@ static void cafe_ctlr_init(struct cafe_camera *cam)
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
/*
* Here we must wait a bit for the controller to come around.
*/
spin_unlock_irqrestore(&cam->dev_lock, flags);
mdelay(5); /* FIXME revisit this */
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
/*
@ -773,9 +779,9 @@ static void cafe_ctlr_power_up(struct cafe_camera *cam)
* Control 1 is power down, set to 0 to operate.
*/
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */
mdelay(1); /* Marvell says 1ms will do it */
// mdelay(1); /* Marvell says 1ms will do it */
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
mdelay(1); /* Enough? */
// mdelay(1); /* Enough? */
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
@ -1796,18 +1802,19 @@ static void cafe_frame_tasklet(unsigned long data)
if (list_empty(&cam->sb_avail))
break; /* Leave it valid, hope for better later */
clear_bit(bufno, &cam->flags);
/*
* We could perhaps drop the spinlock during this
* big copy. Something to consider.
*/
sbuf = list_entry(cam->sb_avail.next,
struct cafe_sio_buffer, list);
/*
* Drop the lock during the big copy. This *should* be safe...
*/
spin_unlock_irqrestore(&cam->dev_lock, flags);
memcpy(sbuf->buffer, cam->dma_bufs[bufno],
cam->pix_format.sizeimage);
sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
spin_lock_irqsave(&cam->dev_lock, flags);
list_move_tail(&sbuf->list, &cam->sb_full);
}
if (! list_empty(&cam->sb_full))