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drm/tegra: Stop channel DMA during suspend

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When channels are kept open over a suspend cycle, we need to
re-initialize CDMA after resume.

Bug 4133027

Change-Id: I9a2737b377a9ffb37e5f98703b7928bfceab58e3
Signed-off-by: Mainak Sen <msen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2963164
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Mainak Sen
2023-08-17 09:06:57 +00:00
committed by mobile promotions
parent 7d1a687636
commit 420b84b69d
3 changed files with 20 additions and 1 deletions
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17
drivers/gpu/host1x/channel.c
View File

@@ -117,6 +117,23 @@ static struct host1x_channel *acquire_unused_channel(struct host1x *host)
return &chlist->channels[index]; return &chlist->channels[index];
} }
/**
* host1x_channel_list_stop() - disable cdma on allocated channels
* @chlist: list of host1x channels
*
* Stop DMA on the allocated channels during suspend
*/
void host1x_channel_list_stop(struct host1x_channel_list *chlist)
{
struct host1x *host = container_of(chlist, struct host1x, channel_list);
int i;
for (i = 0; i < host->info->nb_channels; i++) {
if (!test_bit(i, chlist->allocated_channels))
continue;
host1x_channel_stop(&chlist->channels[i]);
}
}
/** /**
* host1x_channel_request() - Allocate a channel * host1x_channel_request() - Allocate a channel
* @client: Host1x client this channel will be used to send commands to * @client: Host1x client this channel will be used to send commands to

1
drivers/gpu/host1x/channel.h
View File

@@ -37,5 +37,6 @@ int host1x_channel_list_init(struct host1x_channel_list *chlist,
void host1x_channel_list_free(struct host1x_channel_list *chlist); void host1x_channel_list_free(struct host1x_channel_list *chlist);
struct host1x_channel *host1x_channel_get_index(struct host1x *host, struct host1x_channel *host1x_channel_get_index(struct host1x *host,
unsigned int index); unsigned int index);
void host1x_channel_list_stop(struct host1x_channel_list *chlist);
#endif #endif

3
drivers/gpu/host1x/dev.c
View File

@@ -1015,6 +1015,7 @@ static int __maybe_unused host1x_runtime_suspend(struct device *dev)
int err; int err;
host1x_hw_intr_disable_all_general_intrs(host); host1x_hw_intr_disable_all_general_intrs(host);
host1x_channel_list_stop(&host->channel_list);
host1x_intr_stop(host); host1x_intr_stop(host);
host1x_syncpt_save(host); host1x_syncpt_save(host);
@@ -1090,7 +1091,7 @@ release_reset:
static const struct dev_pm_ops host1x_pm_ops = { static const struct dev_pm_ops host1x_pm_ops = {
SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume, SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume,
NULL) NULL)
/* TODO: add system suspend-resume once driver will be ready for that */ SET_SYSTEM_SLEEP_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume)
}; };
static struct platform_driver tegra_host1x_driver = { static struct platform_driver tegra_host1x_driver = {