From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org,
vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com,
srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com,
Bard liao <yung-chuan.liao@linux.intel.com>,
Rander Wang <rander.wang@linux.intel.com>,
Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
Sanyog Kale <sanyog.r.kale@intel.com>
Subject: [PATCH 1/3] soundwire: remove bitfield for unique_id, use u8
Date: Tue, 22 Oct 2019 18:48:06 -0500 [thread overview]
Message-ID: <20191022234808.17432-2-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <20191022234808.17432-1-pierre-louis.bossart@linux.intel.com>
There is no good reason why the unique_id needs to be stored as 4
bits. The code will work without changes with a u8 since all values
are already filtered while parsing the ACPI tables and Slave devID
registers.
Use u8 representation. This will allow us to encode a
"IGNORE_UNIQUE_ID" value to account for firmware/BIOS creativity.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
include/linux/soundwire/sdw.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 688b40e65c89..28745b9ba279 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -403,6 +403,8 @@ int sdw_slave_read_prop(struct sdw_slave *slave);
* SDW Slave Structures and APIs
*/
+#define SDW_IGNORED_UNIQUE_ID 0xFF
+
/**
* struct sdw_slave_id - Slave ID
* @mfg_id: MIPI Manufacturer ID
@@ -418,7 +420,7 @@ struct sdw_slave_id {
__u16 mfg_id;
__u16 part_id;
__u8 class_id;
- __u8 unique_id:4;
+ __u8 unique_id;
__u8 sdw_version:4;
};
--
2.20.1
next prev parent reply other threads:[~2019-10-22 23:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-22 23:48 [PATCH 0/3] soundwire: use UniqueID only when relevant Pierre-Louis Bossart
2019-10-22 23:48 ` Pierre-Louis Bossart [this message]
2019-10-24 11:29 ` [PATCH 1/3] soundwire: remove bitfield for unique_id, use u8 Vinod Koul
2019-10-24 12:42 ` [alsa-devel] " Pierre-Louis Bossart
2019-10-22 23:48 ` [PATCH 2/3] soundwire: slave: add helper to extract slave ID Pierre-Louis Bossart
2019-10-22 23:48 ` [PATCH 3/3] soundwire: ignore uniqueID when irrelevant Pierre-Louis Bossart
2019-10-24 11:39 ` Vinod Koul
2019-10-24 12:59 ` [alsa-devel] " Pierre-Louis Bossart
2019-11-06 19:30 ` [alsa-devel] [PATCH 0/3] soundwire: use UniqueID only when relevant Pierre-Louis Bossart
2019-11-09 11:18 ` Vinod Koul
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