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authorSudeep Holla <sudeep.holla@arm.com>2017-07-21 11:42:24 +0100
committerSudeep Holla <sudeep.holla@arm.com>2018-02-28 16:37:57 +0000
commit5c4ba3cc85296398855d621bf90b78866ea80444 (patch)
tree327682b15c2d4d18659b4215efa5781b0a767f96 /drivers/firmware
parentd4c3751a8de2deeaae546b97650f895b62bbd1b4 (diff)
downloadlinux-5c4ba3cc85296398855d621bf90b78866ea80444.tar.bz2
firmware: arm_scmi: add option for polling based performance domain operations
In order to implement fast CPU DVFS switching, we need to perform all DVFS operations atomically. Since SCMI transfer already provide option to choose between pooling vs interrupt driven(default), we can opt for polling based transfers for set,get performance domain operations. This patch adds option to choose between polling vs interrupt driven SCMI transfers for set,get performance level operations. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/arm_scmi/perf.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 9c56ea503890..987c64d19801 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -292,8 +292,8 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
-static int
-scmi_perf_level_set(const struct scmi_handle *handle, u32 domain, u32 level)
+static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
+ u32 level, bool poll)
{
int ret;
struct scmi_xfer *t;
@@ -304,6 +304,7 @@ scmi_perf_level_set(const struct scmi_handle *handle, u32 domain, u32 level)
if (ret)
return ret;
+ t->hdr.poll_completion = poll;
lvl = t->tx.buf;
lvl->domain = cpu_to_le32(domain);
lvl->level = cpu_to_le32(level);
@@ -314,8 +315,8 @@ scmi_perf_level_set(const struct scmi_handle *handle, u32 domain, u32 level)
return ret;
}
-static int
-scmi_perf_level_get(const struct scmi_handle *handle, u32 domain, u32 *level)
+static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
+ u32 *level, bool poll)
{
int ret;
struct scmi_xfer *t;
@@ -325,6 +326,7 @@ scmi_perf_level_get(const struct scmi_handle *handle, u32 domain, u32 *level)
if (ret)
return ret;
+ t->hdr.poll_completion = poll;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
ret = scmi_do_xfer(handle, t);
@@ -400,23 +402,24 @@ static int scmi_dvfs_get_transition_latency(const struct scmi_handle *handle,
}
static int scmi_dvfs_freq_set(const struct scmi_handle *handle, u32 domain,
- unsigned long freq)
+ unsigned long freq, bool poll)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
- return scmi_perf_level_set(handle, domain, freq / dom->mult_factor);
+ return scmi_perf_level_set(handle, domain, freq / dom->mult_factor,
+ poll);
}
static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain,
- unsigned long *freq)
+ unsigned long *freq, bool poll)
{
int ret;
u32 level;
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
- ret = scmi_perf_level_get(handle, domain, &level);
+ ret = scmi_perf_level_get(handle, domain, &level, poll);
if (!ret)
*freq = level * dom->mult_factor;