[PATCH] V4L: Enables audio DMA setting on cx88 chips, even when dma not in use
- Enabled audio DMA transfer code even when DMA not in use to solve a
problem on some broken cx88 chips.
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index b18e7a3..bb6eb54 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -837,6 +837,29 @@
return -1;
}
+int cx88_start_audio_dma(struct cx88_core *core)
+{
+ /* setup fifo + format */
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
+
+ cx_write(MO_AUDD_LNGTH, 128); /* fifo bpl size */
+ cx_write(MO_AUDR_LNGTH, 128); /* fifo bpl size */
+
+ /* start dma */
+ cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
+
+ return 0;
+}
+
+int cx88_stop_audio_dma(struct cx88_core *core)
+{
+ /* stop dma */
+ cx_write(MO_AUD_DMACNTRL, 0x0000);
+
+ return 0;
+}
+
static int set_tvaudio(struct cx88_core *core)
{
struct cx88_tvnorm *norm = core->tvnorm;
@@ -877,9 +900,16 @@
cx88_set_tvaudio(core);
/* cx88_set_stereo(dev,V4L2_TUNER_MODE_STEREO); */
+/*
+ This should be needed only on cx88-alsa. It seems that some cx88 chips have
+ bugs and does require DMA enabled for it to work.
+ */
+ cx88_start_audio_dma(core);
return 0;
}
+
+
int cx88_set_tvnorm(struct cx88_core *core, struct cx88_tvnorm *norm)
{
u32 fsc8;
@@ -1201,6 +1231,8 @@
EXPORT_SYMBOL(cx88_vdev_init);
EXPORT_SYMBOL(cx88_core_get);
EXPORT_SYMBOL(cx88_core_put);
+EXPORT_SYMBOL(cx88_start_audio_dma);
+EXPORT_SYMBOL(cx88_stop_audio_dma);
/*
* Local variables: