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gpu: nvgpu: gm20b: write gpccs start only once

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Writing start bit twice can confuse falcon and
results in random behavior.

Bug 200040021

Change-Id: I62eb8e4632ac4fc471d931155471084ee0f9d0a4
Signed-off-by: Vijayakumar <vsubbu@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Vijayakumar
2014-10-17 12:30:03 +05:30
committed by Dan Willemsen
parent c414d4128d
commit c0b619c3cd
1 changed files with 5 additions and 3 deletions
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4
drivers/gpu/nvgpu/gm20b/gr_gm20b.c
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@@ -666,9 +666,11 @@ static int gr_gm20b_load_ctxsw_ucode_segments(struct gk20a *g, u64 addr_base,
gk20a_writel(g, reg_offset + gr_fecs_bootvec_r(), gk20a_writel(g, reg_offset + gr_fecs_bootvec_r(),
gr_fecs_bootvec_vec_f(segments->boot_entry)); gr_fecs_bootvec_vec_f(segments->boot_entry));
/* Write to CPUCTL to start the falcon */ /* start the falcon immediately if PRIV security is disabled*/
if (!g->ops.privsecurity) {
gk20a_writel(g, reg_offset + gr_fecs_cpuctl_r(), gk20a_writel(g, reg_offset + gr_fecs_cpuctl_r(),
gr_fecs_cpuctl_startcpu_f(0x01)); gr_fecs_cpuctl_startcpu_f(0x01));
}
return 0; return 0;
} }