From 2564a2d4418bac166a9db2d6ca2f8b99953b1df5 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Wed, 18 Aug 2021 11:01:30 +0800
Subject: [PATCH] soundwire: cadence: do not extend reset delay
Git-commit: 2564a2d4418bac166a9db2d6ca2f8b99953b1df5
Patch-mainline: v5.15-rc1
References: bsc#1192354
The duration of the hw_reset is defined as 4096 cycles. The Cadence IP
allows for an additional delay which doesn't seem necessary in
Practice: the actual reset sequence duration is defined by the sync_go
mechanism, not by the IP itself.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210818030130.17113-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/soundwire/cadence_master.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 0b7f037e6cd0..4fcc3ba93004 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1032,10 +1032,7 @@ EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
*/
int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
{
- /* program maximum length reset to be safe */
- cdns_updatel(cdns, CDNS_MCP_CONTROL,
- CDNS_MCP_CONTROL_RST_DELAY,
- CDNS_MCP_CONTROL_RST_DELAY);
+ /* keep reset delay unchanged to 4096 cycles */
/* use hardware generated reset */
cdns_updatel(cdns, CDNS_MCP_CONTROL,
--
2.26.2