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gpu: host1x: Fix hang on Tegra186+ 

Tegra186+ hangs if host1x hardware is disabled at a kernel boot time
because we touch hardware before runtime PM is resumed. Move sync point
assignment initialization to the RPM-resume callback. Older SoCs were
unaffected because they skip that sync point initialization.

Tested-by: Jon Hunter <jonathanh@nvidia.com> # T186
Reported-by: Jon Hunter <jonathanh@nvidia.com> # T186
Fixes: 6b6776e2ab ("gpu: host1x: Add initial runtime PM and OPP support")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2021-12-23 17:46:50 +03:00 committed by Thierry Reding
parent e783362eb5
commit 22d7ee32f1
1 changed files with 8 additions and 8 deletions
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16
drivers/gpu/host1x/syncpt.c
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@ -137,8 +137,15 @@ void host1x_syncpt_restore(struct host1x *host)
struct host1x_syncpt *sp_base = host->syncpt;
unsigned int i;
for (i = 0; i < host1x_syncpt_nb_pts(host); i++)
for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {
/*
* Unassign syncpt from channels for purposes of Tegra186
* syncpoint protection. This prevents any channel from
* accessing it until it is reassigned.
*/
host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);
host1x_hw_syncpt_restore(host, sp_base + i);
}
for (i = 0; i < host1x_syncpt_nb_bases(host); i++)
host1x_hw_syncpt_restore_wait_base(host, sp_base + i);
@ -352,13 +359,6 @@ int host1x_syncpt_init(struct host1x *host)
for (i = 0; i < host->info->nb_pts; i++) {
syncpt[i].id = i;
syncpt[i].host = host;
/*
* Unassign syncpt from channels for purposes of Tegra186
* syncpoint protection. This prevents any channel from
* accessing it until it is reassigned.
*/
host1x_hw_syncpt_assign_to_channel(host, &syncpt[i], NULL);
}
for (i = 0; i < host->info->nb_bases; i++)