gpu: nvgpu: get voltage, current, power and temperature

Add ioctls to retrieve voltage, current, power and temperature.
Add flags in GPU characteristics to indicate if feature is supported.

Jira DNVGPU-166

Change-Id: Ifaafe2efdb6b09d7b28215b641814f28e894151e
Signed-off-by: David Martinez Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1241861
Tested-by: Thomas Fleury <tfleury@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-on: http://git-master/r/1267122

1 files changed, 2 insertions, 12 deletions

diff --git a/drivers/gpu/nvgpu/volt/volt_pmu.c b/drivers/gpu/nvgpu/volt/volt_pmu.c
index 4d451b65..a92eb777 100644
--- a/drivers/gpu/nvgpu/volt/volt_pmu.c
+++ b/drivers/gpu/nvgpu/volt/volt_pmu.c
@@ -227,17 +227,7 @@ u32 volt_set_voltage(struct gk20a *g, u32 logic_voltage_uv, u32 sram_voltage_uv)
 
 }
 
-u32 volt_get_voltage(struct gk20a *g, u32 volt_domain)
+u32 volt_get_voltage(struct gk20a *g, u32 volt_domain, u32 *voltage_uv)
 {
-        u32 status = 0;
-        u32 voltage_uv = 0;
-
-        status = volt_rail_get_voltage(g, volt_domain, &voltage_uv);
-        if (status) {
-                gk20a_err(dev_from_gk20a(g),
-                        "CTRL_VOLT_DOMAIN_LOGIC get voltage failed");
-                return 0;
-        }
-
-        return voltage_uv;
+        return volt_rail_get_voltage(g, volt_domain, voltage_uv);
 }