linux-kernel - [PATCH v2 04/17] soundwire: cadence: handle error cases with CONFIG

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Message-Id: <20200317163329.25501-5-pierre-louis.bossart@linux.intel.com>
Date:   Tue, 17 Mar 2020 11:33:16 -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 04/17] soundwire: cadence: handle error cases with CONFIG_UPDATE

config_update() may time out or cannot be use in ClockStopMode

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 1bfdc1d4fcb1..d7f01d39767b 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -239,6 +239,11 @@ static int cdns_config_update(struct sdw_cdns *cdns)
 {
 	int ret;
 
+	if (sdw_cdns_is_clock_stop(cdns)) {
+		dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
+		return -EINVAL;
+	}
+
 	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 			     CDNS_MCP_CONFIG_UPDATE_BIT);
 	if (ret < 0)
-- 
2.20.1