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| author | Sudeep Holla <sudeep.holla@arm.com> | 2022-04-28 13:29:13 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2022-04-28 18:22:52 +0100 |
| commit | 7ad6b6ccbafc1faa04ca9d26635bdd5e3e240a69 (patch) | |
| tree | 7679b54b5f5252d8e9f61f69223df2c9341620a4 /drivers/firmware/arm_scmi/clock.c | |
| parent | b260fccaebdc2c838e62aaef24fedf497f181d10 (diff) | |
| download | lwn-7ad6b6ccbafc1faa04ca9d26635bdd5e3e240a69.tar.gz lwn-7ad6b6ccbafc1faa04ca9d26635bdd5e3e240a69.zip | |
firmware: arm_scmi: Set clock latency to U32_MAX if it is not supported
As per the spec, the clock_enable_delay is the worst case latency
incurred by the platform to enable the clock. The value of 0 indicates
that the platform doesn't support the same and must be considered as
maximum latency for practical purposes.
Currently the value of 0 is assigned as is and is propogated to the clock
framework which can assume that the clock can support atomic enable operation.
Link: https://lore.kernel.org/r/20220428122913.1654821-1-sudeep.holla@arm.com
Fixes: 18f295b758b2 ("firmware: arm_scmi: Add support for clock_enable_latency")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware/arm_scmi/clock.c')
| -rw-r--r-- | drivers/firmware/arm_scmi/clock.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c index 7a031afff389..81f739700893 100644 --- a/drivers/firmware/arm_scmi/clock.c +++ b/drivers/firmware/arm_scmi/clock.c @@ -6,6 +6,7 @@ */ #include <linux/module.h> +#include <linux/limits.h> #include <linux/sort.h> #include "protocols.h" @@ -128,12 +129,13 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph, ret = ph->xops->do_xfer(ph, t); if (!ret) { + u32 latency = 0; attributes = le32_to_cpu(attr->attributes); strlcpy(clk->name, attr->name, SCMI_MAX_STR_SIZE); /* Is optional field clock_enable_latency provided ? */ if (t->rx.len == sizeof(*attr)) - clk->enable_latency = - le32_to_cpu(attr->clock_enable_latency); + latency = le32_to_cpu(attr->clock_enable_latency); + clk->enable_latency = latency ? : U32_MAX; } ph->xops->xfer_put(ph, t); |