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video: tegra: host: Disable 3d powergating

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It is possible for the 3d block to generate an invalid memory
request during the power up sequence in some cases.  Workaround
is to disable 3d block power gating.

Change-Id: I10efad1f7d3dada7cd3fe18e268f06d60bdbab67
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross 2011-01-06 20:16:10 -08:00
parent 0a14acba78
commit 3fd40dad57
1 changed files with 17 additions and 0 deletions
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17
drivers/video/tegra/host/nvhost_acm.c
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@ -30,6 +30,8 @@
#define ACM_TIMEOUT 1*HZ
#define DISABLE_3D_POWERGATING
void nvhost_module_busy(struct nvhost_module *mod)
{
mutex_lock(&mod->lock);
@ -139,6 +141,21 @@ int nvhost_module_init(struct nvhost_module *mod, const char *name,
mod->parent = parent;
mod->powered = false;
mod->powergate_id = get_module_powergate_id(name);
#ifdef DISABLE_3D_POWERGATING
/*
* It is possible for the 3d block to generate an invalid memory
* request during the power up sequence in some cases. Workaround
* is to disable 3d block power gating.
*/
if (mod->powergate_id == TEGRA_POWERGATE_3D) {
tegra_powergate_sequence_power_up(mod->powergate_id,
mod->clk[0]);
clk_disable(mod->clk[0]);
mod->powergate_id = -1;
}
#endif
mutex_init(&mod->lock);
init_waitqueue_head(&mod->idle);
INIT_DELAYED_WORK(&mod->powerdown, powerdown_handler);