linux-kernel - [PATCH v3 14/27] ALSA: hda/cs8409: Avoid setting the same I2C address for every access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210730151844.7873-15-vitalyr@opensource.cirrus.com>
Date:   Fri, 30 Jul 2021 16:18:31 +0100
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Lucas Tanure <tanureal@...nsource.cirrus.com>
Subject: [PATCH v3 14/27] ALSA: hda/cs8409: Avoid setting the same I2C address for every access

From: Lucas Tanure <tanureal@...nsource.cirrus.com>

Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
---

Changes in v2:
- No changes

Changes in v3:
- No changes

 sound/pci/hda/patch_cs8409.c | 19 +++++++++++++++++--
 sound/pci/hda/patch_cs8409.h |  1 +
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/patch_cs8409.c b/sound/pci/hda/patch_cs8409.c
index 1c75aa262ebc..194d336cb060 100644
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -140,6 +140,21 @@ static int cs8409_i2c_wait_complete(struct hda_codec *codec)
 	return -1;
 }
 
+/**
+ * cs8409_set_i2c_dev_addr - Set i2c address for transaction
+ * @codec: the codec instance
+ * @addr: I2C Address
+ */
+static void cs8409_set_i2c_dev_addr(struct hda_codec *codec, unsigned int addr)
+{
+	struct cs8409_spec *spec = codec->spec;
+
+	if (spec->dev_addr != addr) {
+		cs8409_vendor_coef_set(codec, CS8409_I2C_ADDR, addr);
+		spec->dev_addr = addr;
+	}
+}
+
 /**
  * cs8409_i2c_read - CS8409 I2C Read.
  * @codec: the codec instance
@@ -161,7 +176,7 @@ static int cs8409_i2c_read(struct hda_codec *codec, unsigned int i2c_address, un
 		return -EPERM;
 
 	cs8409_enable_i2c_clock(codec);
-	cs8409_vendor_coef_set(codec, CS8409_I2C_ADDR, i2c_address);
+	cs8409_set_i2c_dev_addr(codec, i2c_address);
 
 	if (paged) {
 		cs8409_vendor_coef_set(codec, CS8409_I2C_QWRITE, i2c_reg >> 8);
@@ -207,7 +222,7 @@ static int cs8409_i2c_write(struct hda_codec *codec, unsigned int i2c_address, u
 		return -EPERM;
 
 	cs8409_enable_i2c_clock(codec);
-	cs8409_vendor_coef_set(codec, CS8409_I2C_ADDR, i2c_address);
+	cs8409_set_i2c_dev_addr(codec, i2c_address);
 
 	if (paged) {
 		cs8409_vendor_coef_set(codec, CS8409_I2C_QWRITE, i2c_reg >> 8);
diff --git a/sound/pci/hda/patch_cs8409.h b/sound/pci/hda/patch_cs8409.h
index 542582c213d2..c2c208218e34 100644
--- a/sound/pci/hda/patch_cs8409.h
+++ b/sound/pci/hda/patch_cs8409.h
@@ -281,6 +281,7 @@ struct cs8409_spec {
 
 	struct mutex cs8409_i2c_mux;
 	unsigned int i2c_clck_enabled;
+	unsigned int dev_addr;
 	struct delayed_work i2c_clk_work;
 
 	/* verb exec op override */
-- 
2.25.1