Dear Sudhakar (and Kevin)
I'm sorry, I have forgotten to apply a patch of mine to file
sound/oss/davinci-audio-aic33.c
I developed this patch because on our custom board the MCLK clock frequency is
always
256*Fs, where Fs denotes the audio sampling frequency, and Fs can be 32000,
44100 or 48000.
The patch is
Index: linux-davinci-2.6.25/sound/oss/davinci-audio-aic33.c
===================================================================
--- linux-davinci-2.6.25.orig/sound/oss/davinci-audio-aic33.c
+++ linux-davinci-2.6.25/sound/oss/davinci-audio-aic33.c
@@ -16,6 +16,7 @@
* History:
* -------
* 2005-10-18 Rishi Bhattacharya - Support for AIC33 codec and Davinci DM644x
Processor
+ * 2008-09-08 Gabriele Filosofi - Support for IPvPhone Digital Module (ADFL
Consulting s.r.l.)
*/
#include <linux/module.h>
@@ -635,8 +636,17 @@ int davinci_set_samplerate(long sample_r
/* If PLL is to be used for generation of Fsref
Generate the Fsref using the PLL */
-#if(MCLK==33)
-
+#ifdef CONFIG_MACH_DAVINCI_IPVP
+ /*
+ * For this board we know MCLK = 256*Fsref,
+ * so the register programming is Fsres independent
+ */
+ /*Enable the PLL | Q-value | P-value */
+ audio_aic33_write(3, PLL_ENABLE | 0x10 | 0x02);
+ audio_aic33_write(4, (16 << 2)); /* J-value */
+ audio_aic33_write(5, 0x00); /* D-value 8-MSB's */
+ audio_aic33_write(6, 0x00); /* D-value 6-LSB's */
+#elif(MCLK==33)
if ((reg_info[count].Fsref == 96000) | (reg_info[count].Fsref ==
48000)) {
/* For MCLK = 33.8688 MHz and to get Fsref = 48kHz
Fsref = (MCLK * k * R)/(2048 * p);
Now I've re-applied the patch and the playback works good.
I apologize for the inconvenience my help request may have caused.
Gabriele
Da: Rajashekhara, Sudhakar [mailto:[EMAIL PROTECTED]
Inviato: giovedì 13 novembre 2008 13.51
A: Gabriele Filosofi; [email protected]
Oggetto: RE: DM6446: audio slowness on 2.6.27
Gabriele,
Even Kevin had reported the same issue, but we could not reproduce this on our
setup. Can you please send us your kernel Image (uImage) so that we can test it
again on our EVM?
Regards, Sudhakar
________________________________
From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of Gabriele Filosofi [EMAIL
PROTECTED]
Sent: Thursday, November 13, 2008 1:16 PM
To: [email protected]
Subject: I: DM6446: audio slowness on 2.6.27
Hi all,
I've ported our dm644x-based system from git kernel v2.6.25-davinci1 to
v2.6.27-davinci1, and I've noticed the audio playback slowed down, as
previously reported from you. This can be easily verified with
cp file.wav /dev/dsp
Is there anybody out there who faced this issue and/or can give an explanation?
Thanks a lot in advance.
Regards,
Gabriele
_____________________________________________
Da: Gabriele Filosofi
Inviato: mercoledì 12 novembre 2008 9.20
A: '[EMAIL PROTECTED]'
Cc: '[email protected]'
Oggetto: DM6446: audio slowness on 2.6.27
Hi Kevin,
I've ported our dm644x-based system from git kernel v2.6.25-davinci1 to
v2.6.27-davinci1, and I've noticed the audio playback slowed down, as
previously reported from you. This can be easily verified with
cp file.wav /dev/dsp
Did you find something that could be the cause this strange behavior?
Gabriele
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