Dear Mark,
Thanks a lot for your help, and I have other questions needed your help below.
On Sun, May 16, 2010 at 11:34:01PM +0800, Wan ZongShun wrote:
This all looks pretty good. A few comments below but they're all fairly minor and should be easy to address.
index b1749bc..81d4848 100644 --- a/sound/soc/Kconfig +++ b/sound/soc/Kconfig @@ -36,6 +36,7 @@ source "sound/soc/s3c24xx/Kconfig" source "sound/soc/s6000/Kconfig" source "sound/soc/sh/Kconfig" source "sound/soc/txx9/Kconfig" +source "sound/soc/nuc900/Kconfig"
Please keep the Kconfig and Makefile sorted, this helps avoid merge issues.
+#define NUC900_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)SNDRV_PCM_RATE_8000_48000.
- if (!timeout)
dev_err(nuc900_audio->dev, "AC97 read register time out !\n");- val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
If the read timed out shouldn't we be returning rather than continuing?
- val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
- val &= (~AC_C_RES);
- AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
- udelay(1000);
- if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
dev_err(nuc900_audio->dev, "AC97 codec cold reset failed!\n");What is this actually checking in the hardware? Not all CODECs enable the AC97 link by default after a cold reset, the standard allows them to power up in a low power state which will
The bit 'CODEC_READY' indicates the external AC97 audio CODEC is ready, I just forget to implement the warm reset operation, if need, I will do it. In addition, Can I add the checking CODEC_READY operation to warm reset function?
On the other hand, given that there's no warm reset operation perhaps this isn't a big deal.
+static void nuc900_ac97_remove(struct platform_device *pdev,
struct snd_soc_dai *dai)+{
- struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
- /* Enable unit clock */
- clk_disable(nuc900_audio->clk);
Bit rot in the comments here.
+/* bit definition of REG_ACTL_CON register */ +#define AUDCLK_EN 0x8000 +#define PFIFO_EN 0x4000 +#define RFIFO_EN 0x2000
I rechecked the latest datasheet, and I find above bits has been removed, so I delete them here.
These constants (and the rest) really should be namespaced - they're likely to collide with other definitions in, for example, CODEC drivers used by machines.
+#define IIS_EN 0x0002
Looks like there's I2S support to come?
Yes,nuc900 supports both IIS and AC97,but my board only enable AC97 support, what's up here?
+static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id) +{
- snd_pcm_period_elapsed(substream);
- return IRQ_HANDLED;
This is done unconditionally - are you sure there can't be any spurious interrupts (eg, error interrupts). It shouldn't cause any harm, of course.
Wan .(Vincent)