linux-kernel - [PATCH v2 14/17] soundwire: cadence: remove automatic command retries

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Message-Id: <20200317163329.25501-15-pierre-louis.bossart@linux.intel.com>
Date:   Tue, 17 Mar 2020 11:33:26 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Hui Wang <hui.wang@...onical.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [PATCH v2 14/17] soundwire: cadence: remove automatic command retries

This is a good idea on paper, but it's not recommended at all when
operating in multi-master mode. It's also not recommended when doing
bank switches, since the retransmission would happen at the next SSP,
and the command protocol is stuck in the mean time.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 420ad23c5530..c9fdd4deb4f5 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1109,8 +1109,7 @@ int sdw_cdns_init(struct sdw_cdns *cdns)
 
 	/* leave frame delay to hardware default of 0x1F */
 
-	/* Set Max cmd retry to 15 */
-	val |= CDNS_MCP_CONFIG_MCMD_RETRY;
+	/* leave command retry to hardware default of 0 */
 
 	cdns_writel(cdns, CDNS_MCP_CONFIG, val);
 
-- 
2.20.1