linux-kernel - [PATCH AUTOSEL 5.17 20/60] soundwire: qcom: adjust autoenumeration timeout

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Message-Id: <20220607175259.478835-20-sashal@kernel.org>
Date:   Tue,  7 Jun 2022 13:52:17 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>,
        agross@...nel.org, bjorn.andersson@...aro.org,
        yung-chuan.liao@...ux.intel.com, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 5.17 20/60] soundwire: qcom: adjust autoenumeration timeout

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

[ Upstream commit 74da272400b46f2e898f115d1b1cd60828766919 ]

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>
Link: https://lore.kernel.org/r/20220506084705.18525-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 54813417ef8e..249f1b69ec94 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -99,7 +99,7 @@
 
 #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
-- 
2.35.1