linux-kernel - [PATCH v2] soundwire: qcom: adjust autoenumeration timeout

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Date:   Fri,  6 May 2022 09:47:05 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     vkoul@...nel.org
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
Subject: [PATCH v2] soundwire: qcom: adjust autoenumeration timeout

Currently timeout for autoenumeration during probe and bus reset is set to
2 secs which is really a big value. This can have an adverse effect on
boot time if the slave device is not ready/reset.
This was the case with wcd938x which was not reset yet but we spent 2
secs waiting in the soundwire controller probe. Reduce this time to
1/10 of Hz which should be good enough time to finish autoenumeration
if any slaves are available on the bus.

Reported-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---

Changes since v1:
	replaced HZ/10 with 100 as suggested by Pierre

 drivers/soundwire/qcom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 7367aa88b8ac..d6111f69d320 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -105,7 +105,7 @@
 
 #define SWRM_SPECIAL_CMD_ID	0xF
 #define MAX_FREQ_NUM		1
-#define TIMEOUT_MS		(2 * HZ)
+#define TIMEOUT_MS		100
 #define QCOM_SWRM_MAX_RD_LEN	0x1
 #define QCOM_SDW_MAX_PORTS	14
 #define DEFAULT_CLK_FREQ	9600000
-- 
2.21.0