linux-kernel - [RFC PATCH 30/40] soundwire: cadence_master: add kernel parameter to override interrupt mask

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Message-Id: <20190725234032.21152-31-pierre-louis.bossart@linux.intel.com>
Date:   Thu, 25 Jul 2019 18:40:22 -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,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [RFC PATCH 30/40] soundwire: cadence_master: add kernel parameter to override interrupt mask

The code has a set of defaults which may not be relevant in all cases,
add kernel parameter as a helper - mostly for early board bring-up.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 18c6ac026e85..dede55072191 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -20,6 +20,10 @@
 #include "bus.h"
 #include "cadence_master.h"
 
+static int interrupt_mask;
+module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
+MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
+
 #define CDNS_MCP_CONFIG				0x0
 
 #define CDNS_MCP_CONFIG_MCMD_RETRY		GENMASK(27, 24)
@@ -830,6 +834,9 @@ int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
 	/* now enable all of the above */
 	mask |= CDNS_MCP_INT_IRQ;
 
+	if (interrupt_mask) /* parameter override */
+		mask = interrupt_mask;
+
 	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 
 	return do_reset(cdns);
-- 
2.20.1