linux-kernel - [PATCH 24/27] ALSA: hda/cs8409: Use timeout rather than retries for I2C transaction waits

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Date:   Mon, 26 Jul 2021 18:46:37 +0100
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH 24/27] ALSA: hda/cs8409: Use timeout rather than retries for I2C transaction waits

From: Stefan Binding <sbinding@...nsource.cirrus.com>

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
---
 sound/pci/hda/patch_cs8409.c | 16 +++-------------
 sound/pci/hda/patch_cs8409.h |  2 ++
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/sound/pci/hda/patch_cs8409.c b/sound/pci/hda/patch_cs8409.c
index 1dd55bf66a06..e0ea27124985 100644
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -116,24 +116,14 @@ static void cs8409_enable_i2c_clock(struct hda_codec *codec)
  * @codec: the codec instance
  *
  * Wait for I2C transaction to complete.
- * Return -1 if transaction wait times out.
+ * Return -ETIMEDOUT if transaction wait times out.
  */
 static int cs8409_i2c_wait_complete(struct hda_codec *codec)
 {
-	int repeat = 5;
 	unsigned int retval;
 
-	do {
-		retval = cs8409_vendor_coef_get(codec, CS8409_I2C_STS);
-		if ((retval & 0x18) != 0x18) {
-			usleep_range(2000, 4000);
-			--repeat;
-		} else
-			return 0;
-
-	} while (repeat);
-
-	return -1;
+	return read_poll_timeout(cs8409_vendor_coef_get, retval, retval & 0x18,
+		CS42L42_I2C_SLEEP_US, CS42L42_I2C_TIMEOUT_US, false, codec, CS8409_I2C_STS);
 }
 
 /**
diff --git a/sound/pci/hda/patch_cs8409.h b/sound/pci/hda/patch_cs8409.h
index 2208be2ffad1..71dbbd8e2f3b 100644
--- a/sound/pci/hda/patch_cs8409.h
+++ b/sound/pci/hda/patch_cs8409.h
@@ -231,6 +231,8 @@ enum cs8409_coefficient_index_registers {
 #define CS42L42_HSTYPE_MASK			(0x03)
 #define CS42L42_JACK_INSERTED			(0x0C)
 #define CS42L42_JACK_REMOVED			(0x00)
+#define CS42L42_I2C_TIMEOUT_US			(20000)
+#define CS42L42_I2C_SLEEP_US			(2000)
 
 /* Dell BULLSEYE / WARLOCK / CYBORG Specific Definitions */
 
-- 
2.25.1