linux-kernel - [PATCH] soundwire: intel: Make DEV_NUM_IDA

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Message-ID: <20230508103901.7840-1-rf@opensource.cirrus.com>
Date:   Mon, 8 May 2023 11:39:01 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <vkoul@...nel.org>, <pierre-louis.bossart@...ux.intel.com>
CC:     <yung-chuan.liao@...ux.intel.com>, <sanyog.r.kale@...el.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH] soundwire: intel: Make DEV_NUM_IDA_MIN a module param

Add a module param so that globally-unique peripheral ID
allocation is only enabled if wanted.

The globally-unique IDs were introduced by
commit c60561014257
("soundwire: bus: allow device number to be unique at system level")

and
commit 1f2dcf3a154a ("soundwire: intel: set dev_num_ida_min")

Assigning globally-unique IDs limits the total number of
peripherals in a system, and the above two commits limit to a
maximum of 8 peripherals. We now have hardware with more than
8 peripherals in total, so this limit is a problem. As the
original commit says that it is only for debug it can be made
optional.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 drivers/soundwire/intel_auxdevice.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c
index b21e86084f7b..9ebbf652e47a 100644
--- a/drivers/soundwire/intel_auxdevice.c
+++ b/drivers/soundwire/intel_auxdevice.c
@@ -23,8 +23,13 @@
 #include "intel.h"
 #include "intel_auxdevice.h"
 
-/* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */
-#define INTEL_DEV_NUM_IDA_MIN           4
+/*
+ * sdw_dev_num_min: Set to non-zero to enable globally-unique peripheral IDs.
+ * The value is the minimum ID that will be allocated.
+ */
+static int intel_dev_num_ida_min;
+module_param_named(sdw_dev_num_min, intel_dev_num_ida_min, int, 0444);
+MODULE_PARM_DESC(sdw_dev_num_min, "SoundWire Intel Master min globally-unique ID (0 to disable)");
 
 #define INTEL_MASTER_SUSPEND_DELAY_MS	3000
 
@@ -148,7 +153,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 	cdns->msg_count = 0;
 
 	bus->link_id = auxdev->id;
-	bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
+	bus->dev_num_ida_min = intel_dev_num_ida_min;
 	bus->clk_stop_timeout = 1;
 
 	sdw_cdns_probe(cdns);
-- 
2.30.2