diff options
| author | Misael Lopez Cruz <misael.lopez@ti.com> | 2012-03-14 21:09:47 -0500 |
|---|---|---|
| committer | Dmytro Kedrovskyi <x0169235@ti.com> | 2012-05-03 16:14:31 +0300 |
| commit | d548e4e4172f2a39f15fbaad7aa6d2fcafe14681 (patch) | |
| tree | 08a2ec34757feb107bdc9b178f5777a0c2f5c4e7 | |
| parent | 90382d37b387065fa0d14c1caa0fe4115c5a482c (diff) | |
| download | kernel_samsung_espresso10-d548e4e4172f2a39f15fbaad7aa6d2fcafe14681.zip kernel_samsung_espresso10-d548e4e4172f2a39f15fbaad7aa6d2fcafe14681.tar.gz kernel_samsung_espresso10-d548e4e4172f2a39f15fbaad7aa6d2fcafe14681.tar.bz2 | |
ASoC: sdp4430: Control CDC CLK2 based on TWL6040 power mode
TWL6040 requires MCLK to be active as long as high-performance
mode is in use, as glitch-free mux cannot tolerate MCLK gating.
TWL6040 doesn't require MCLK for low-power mode as it uses 32k
clock. SDP4430 machine driver can control CDC CLK2 request by
driving it through internal request and controlling internal
request value depending on power-mode.
Change-Id: I7314bc35c2811a5a3d94b6317778bc05f807e755
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
| -rw-r--r-- | sound/soc/omap/Kconfig | 1 | ||||
| -rwxr-xr-x | sound/soc/omap/sdp4430.c | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig index c2d7ff3..e2958e4 100644 --- a/sound/soc/omap/Kconfig +++ b/sound/soc/omap/Kconfig @@ -124,6 +124,7 @@ config SND_OMAP_SOC_SDP4430 select SND_OMAP_SOC_DMIC select SND_OMAP_SOC_ABE_DSP select SND_OMAP_SOC_VXREC + select CDC_TCXO if (MACH_OMAP_4430SDP || MACH_OMAP4_TABLET) help Say Y if you want to add support for SoC audio on Texas Instruments SDP4430 or PandaBoard. diff --git a/sound/soc/omap/sdp4430.c b/sound/soc/omap/sdp4430.c index 7e7138d..2689514 100755 --- a/sound/soc/omap/sdp4430.c +++ b/sound/soc/omap/sdp4430.c @@ -25,6 +25,7 @@ #include <linux/i2c.h> #include <linux/i2c/twl.h> #include <linux/regulator/consumer.h> +#include <linux/cdc_tcxo.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> @@ -151,6 +152,17 @@ static int sdp4430_mcpdm_startup(struct snd_pcm_substream *substream) if (twl6040_power_mode) { clk_id = TWL6040_HPPLL_ID; freq = 38400000; + + /* + * TWL6040 requires MCLK to be active as long as + * high-performance mode is in use. Glitch-free mux + * cannot tolerate MCLK gating + */ + ret = cdc_tcxo_set_req_int(CDC_TCXO_CLK2, 1); + if (ret) { + printk(KERN_ERR "failed to enable twl6040 MCLK\n"); + goto err; + } } else { clk_id = TWL6040_LPPLL_ID; freq = 32768; @@ -164,6 +176,13 @@ static int sdp4430_mcpdm_startup(struct snd_pcm_substream *substream) goto err; } + /* low-power mode uses 32k clock, MCLK is not required */ + if (!twl6040_power_mode) { + ret = cdc_tcxo_set_req_int(CDC_TCXO_CLK2, 0); + if (ret) + printk(KERN_ERR "failed to disable twl6040 MCLK\n"); + } + return 0; err: @@ -1110,6 +1129,16 @@ static int __init sdp4430_soc_init(void) goto err_dev; } + /* Default mode is low-power, MCLK not required */ + twl6040_power_mode = 0; + cdc_tcxo_set_req_int(CDC_TCXO_CLK2, 0); + + /* + * CDC CLK2 supplies TWL6040 MCLK, drive it from REQ2INT to + * have full control of MCLK gating + */ + cdc_tcxo_set_req_prio(CDC_TCXO_CLK2, CDC_TCXO_PRIO_REQINT); + return ret; err_dev: @@ -1123,6 +1152,8 @@ module_init(sdp4430_soc_init); static void __exit sdp4430_soc_exit(void) { regulator_put(av_switch_reg); + cdc_tcxo_set_req_int(CDC_TCXO_CLK2, 0); + cdc_tcxo_set_req_prio(CDC_TCXO_CLK2, CDC_TCXO_PRIO_REQINT); platform_device_unregister(sdp4430_snd_device); snd_soc_unregister_dais(&sdp4430_snd_device->dev, ARRAY_SIZE(dai)); } |