diff mbox series

[12/15] ASoC: cs42l42: Wait at least 150us after writing SCLK_PRESENT

Message ID 20210302170454.39679-13-tanureal@opensource.cirrus.com (mailing list archive)
State Superseded
Headers show
Series Report jack and button detection + Capture Support | expand

Commit Message

Lucas Tanure March 2, 2021, 5:04 p.m. UTC 
From: Richard Fitzgerald <rf@opensource.cirrus.com>

There must be a delay of at least 150us after writing SCLK_PRESENT
before issuing another I2C write.

This is done using struct reg_sequence because it can specify a delay
after the write and the whole sequence is written atomically.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
 sound/soc/codecs/cs42l42.c | 28 +++++++++++++++++++++++-----
 sound/soc/codecs/cs42l42.h |  1 +
 2 files changed, 24 insertions(+), 5 deletions(-)

Comments

Mark Brown March 2, 2021, 5:30 p.m. UTC | #1 
On Tue, Mar 02, 2021 at 05:04:51PM +0000, Lucas Tanure wrote:

> Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
> ---

You've not provided a Signed-off-by for this so I can't do anything with
it, please see Documentation/process/submitting-patches.rst for details
on what this is and why it's important.
kernel test robot March 2, 2021, 10:56 p.m. UTC | #2 
Hi Lucas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on asoc/for-next]
[also build test WARNING on v5.12-rc1 next-20210302]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Lucas-Tanure/Report-jack-and-button-detection-Capture-Support/20210303-012348
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: microblaze-randconfig-c003-20210303 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


"coccinelle warnings: (new ones prefixed by >>)"
>> sound/soc/codecs/cs42l42.c:811:2-3: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 7898a2d52a3b7..5755f8baddbcf 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -517,6 +517,24 @@  static const struct snd_soc_dapm_route cs42l42_audio_map[] = {
 	{ "SDOUT2", NULL, "ASP TX EN" },
 };
 
+/* Switch to SCLK. Atomic delay after the write to allow the switch to complete. */
+static const struct reg_sequence cs42l42_to_sclk_seq[] = {
+	{
+		.reg = CS42L42_OSC_SWITCH,
+		.def = CS42L42_SCLK_PRESENT_MASK,
+		.delay_us = CS42L42_CLOCK_SWITCH_DELAY_US,
+	},
+};
+
+/* Switch to OSC. Atomic delay after the write to allow the switch to complete. */
+static const struct reg_sequence cs42l42_to_osc_seq[] = {
+	{
+		.reg = CS42L42_OSC_SWITCH,
+		.def = 0,
+		.delay_us = CS42L42_CLOCK_SWITCH_DELAY_US,
+	},
+};
+
 struct cs42l42_pll_params {
 	u32 sclk;
 	u8 mclk_div;
@@ -809,6 +827,7 @@  static int cs42l42_set_sysclk(struct snd_soc_dai *dai,
 static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 {
 	struct snd_soc_component *component = dai->component;
+	struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component);
 	unsigned int regval;
 	u8 fullScaleVol;
 
@@ -828,8 +847,8 @@  static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 			 * SCLK must remain running until after this clock switch.
 			 * Without a source of clock the I2C bus doesn't work.
 			 */
-			snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
-						      CS42L42_SCLK_PRESENT_MASK, 0);
+			regmap_multi_reg_write(cs42l42->regmap, cs42l42_to_osc_seq,
+					       ARRAY_SIZE(cs42l42_to_osc_seq));
 			snd_soc_component_update_bits(component, CS42L42_PLL_CTL1,
 						      CS42L42_PLL_START_MASK, 0);
 		}
@@ -840,9 +859,8 @@  static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 						      CS42L42_PLL_START_MASK, 1);
 
 			/* Mark SCLK as present, turn off internal oscillator */
-			snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
-						      CS42L42_SCLK_PRESENT_MASK,
-						      CS42L42_SCLK_PRESENT_MASK);
+			regmap_multi_reg_write(cs42l42->regmap, cs42l42_to_sclk_seq,
+					       ARRAY_SIZE(cs42l42_to_sclk_seq));
 		}
 		cs42l42->stream_use |= 1 << stream;
 
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index 1df9577e367c1..a0c87f2326e69 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -755,6 +755,7 @@ 
 
 #define CS42L42_NUM_SUPPLIES	5
 #define CS42L42_BOOT_TIME_US	3000
+#define CS42L42_CLOCK_SWITCH_DELAY_US 150
 
 static const char *const cs42l42_supply_names[CS42L42_NUM_SUPPLIES] = {
 	"VA",