From 0d667d01c40b2cb9141108951890b9b27ea32584 Mon Sep 17 00:00:00 2001
From: Rander Wang <rander.wang@intel.com>
Date: Tue, 17 Mar 2020 11:33:18 -0500
Subject: [PATCH] soundwire: cadence: fix a io timeout issue in S3 test
Git-commit: 0d667d01c40b2cb9141108951890b9b27ea32584
Patch-mainline: v5.7-rc1
References: jsc#SLE-16518
After system resumes from S3, io timeout occurs when setting one
unused master on Comet Lake platform. In this case, the master is
reset to default state, and FIFOLEVEL is reset to default value,
but msg_count used for tracing FIFOLEVEL is still with old value,
so FIFOLEVEL will not be set if a new msg FIFO usage is equal to
the old msg_count.
This patch updates msg_count to default value of FIFOLEVEL when
resetting master.
Tested on Comet Lake platform.
Signed-off-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200317163329.25501-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/soundwire/cadence_master.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index dc29556eaf94..37e16199933c 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1068,6 +1068,9 @@ int sdw_cdns_init(struct sdw_cdns *cdns)
cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
+ /* reset msg_count to default value of FIFOLEVEL */
+ cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
+
/* flush command FIFOs */
cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
CDNS_MCP_CONTROL_CMD_RST);
--
2.16.4