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gpu: nvgpu: modify nvgpu_writel check and loop

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Currently, nvgpu_writel_loop() writes to a register and immediately
checks if register value is updated. It might take some time for
hardware registers to get updated with value written by software.
Modify nvgpu_writel_loop() to accept number of retries to check if
register value is updated and assert with nvgpu_assert().
Also, move nvgpu_writel_loop() to common code and use generic
nvgpu_readl() and nvgpu_writel() APIs.

JIRA NVGPU-5490

Change-Id: Iaaf24203a91eee3d05de7d0c7dea18113367de5f
Signed-off-by: Vedashree Vidwans <vvidwans@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2348628
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
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Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
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Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
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This commit is contained in:
Vedashree Vidwans
2020-05-21 16:06:04 -07:00
committed by Alex Waterman
parent 86b31c4f7c
commit 2ad015f7a5
5 changed files with 33 additions and 31 deletions
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5
drivers/gpu/nvgpu/os/posix/posix-io.c
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@@ -107,11 +107,6 @@ u32 nvgpu_readl(struct gk20a *g, u32 r)
return access.value;
}
void nvgpu_writel_loop(struct gk20a *g, u32 r, u32 v)
{
BUG();
}
u32 nvgpu_readl_impl(struct gk20a *g, u32 r)
{
struct nvgpu_posix_io_callbacks *callbacks =