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authorCharles Keepax <ckeepax@opensource.cirrus.com>2022-11-25 17:20:27 +0300
committerVinod Koul <vkoul@kernel.org>2023-01-09 19:16:27 +0300
commitb275bf45ba1da1681d75f6434637442f53bf3fa5 (patch)
treef2c90118831e84397dffcb9a9ac42d8feb030489 /drivers/soundwire
parent6726b47a2a60e3f2ef15ee7c4c6d9caa27770576 (diff)
downloadlinux-b275bf45ba1da1681d75f6434637442f53bf3fa5.tar.xz
soundwire: debugfs: Switch to sdw_read_no_pm
It is rather inefficient to be constantly playing with the runtime PM reference for each individual register, switch to holding a PM runtime reference across the whole register output. Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20221125142028.1118618-4-ckeepax@opensource.cirrus.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
-rw-r--r--drivers/soundwire/debugfs.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c
index 49900cd207bc..dea782e0edc4 100644
--- a/drivers/soundwire/debugfs.c
+++ b/drivers/soundwire/debugfs.c
@@ -4,6 +4,7 @@
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/mod_devicetable.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
@@ -35,7 +36,7 @@ static ssize_t sdw_sprintf(struct sdw_slave *slave,
{
int value;
- value = sdw_read(slave, reg);
+ value = sdw_read_no_pm(slave, reg);
if (value < 0)
return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
@@ -55,6 +56,12 @@ static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
if (!buf)
return -ENOMEM;
+ ret = pm_runtime_resume_and_get(&slave->dev);
+ if (ret < 0 && ret != -EACCES) {
+ kfree(buf);
+ return ret;
+ }
+
ret = scnprintf(buf, RD_BUF, "Register Value\n");
/* DP0 non-banked registers */
@@ -112,6 +119,10 @@ static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
}
seq_printf(s_file, "%s", buf);
+
+ pm_runtime_mark_last_busy(&slave->dev);
+ pm_runtime_put(&slave->dev);
+
kfree(buf);
return 0;