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gpu: nvgpu: railgate returns early if no platform implementation

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If platform didn't set railgate/unrailgate callbacks, it means it does
not support railgate.

It avoids vgpu calling tegra_fuse_clock_disable/enable.

Bug 200436689
Jira EVLR-2983

Change-Id: I759dc23145429a59f40cec6e9c1de9536dcf43c4
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1821663
Reviewed-by: svc-misra-checker <svc-misra-checker@nvidia.com>
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vinod Gopalakrishnakurup <vinodg@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Richard Zhao
2018-09-12 10:21:58 -07:00
committed by mobile promotions
parent f4040bae95
commit bf14c2a0fa
1 changed files with 12 additions and 7 deletions
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11
drivers/gpu/nvgpu/os/linux/module.c
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@@ -766,6 +766,10 @@ static int gk20a_pm_railgate(struct device *dev)
int ret = 0;
struct gk20a *g = get_gk20a(dev);
/* return early if platform didn't implement railgate */
if (!platform->railgate)
return 0;
/* if platform is already railgated, then just return */
if (platform->is_railgated && platform->is_railgated(dev))
return ret;
@@ -780,7 +784,6 @@ static int gk20a_pm_railgate(struct device *dev)
g->pstats.last_rail_ungate_complete);
#endif
if (platform->railgate)
ret = platform->railgate(dev);
if (ret) {
nvgpu_err(g, "failed to railgate platform, err=%d", ret);
@@ -803,6 +806,10 @@ static int gk20a_pm_unrailgate(struct device *dev)
int ret = 0;
struct gk20a *g = get_gk20a(dev);
/* return early if platform didn't implement unrailgate */
if (!platform->unrailgate)
return 0;
ret = tegra_fuse_clock_enable();
if (ret) {
nvgpu_err(g, "failed to enable tegra fuse clock, err=%d", ret);
@@ -821,11 +828,9 @@ static int gk20a_pm_unrailgate(struct device *dev)
trace_gk20a_pm_unrailgate(dev_name(dev));
if (platform->unrailgate) {
nvgpu_mutex_acquire(&platform->railgate_lock);
ret = platform->unrailgate(dev);
nvgpu_mutex_release(&platform->railgate_lock);
}
#ifdef CONFIG_DEBUG_FS
g->pstats.last_rail_ungate_complete = jiffies;