/* Gracefully try to shut down the GMU and by extension the GPU */
static void a6xx_gmu_shutdown(struct a6xx_gmu *gmu)
{
struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
struct msm_gpu *gpu = &adreno_gpu->base;
u32 val;
/*
* The GMU may still be in slumber unless the GPU started so check and
* skip putting it back into slumber if so
*/
val = gmu_read(gmu, REG_A6XX_GPU_GMU_CX_GMU_RPMH_POWER_STATE);
if (val != 0xf) {
int ret = a6xx_gmu_wait_for_idle(gmu);
/* If the GMU isn't responding assume it is hung */
if (ret) {
a6xx_gmu_force_off(gmu);
return;
}
/* Clear the VBIF pipe before shutting down */
gpu_write(gpu, REG_A6XX_VBIF_XIN_HALT_CTRL0, 0xf);
spin_until((gpu_read(gpu, REG_A6XX_VBIF_XIN_HALT_CTRL1) & 0xf)
== 0xf);
gpu_write(gpu, REG_A6XX_VBIF_XIN_HALT_CTRL0, 0);
/* tell the GMU we want to slumber */
a6xx_gmu_notify_slumber(gmu);
ret = gmu_poll_timeout(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS, val,
!(val & A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS_GPUBUSYIGNAHB),
100, 10000);
/*
* Let the user know we failed to slumber but don't worry too
* much because we are powering down anyway
*/
if (ret)
DRM_DEV_ERROR(gmu->dev,
"Unable to slumber GMU: status = 0%x/0%x\n",
gmu_read(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS),
gmu_read(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS2));
}
/* Turn off HFI */
a6xx_hfi_stop(gmu);
/* Stop the interrupts and mask the hardware */
a6xx_gmu_irq_disable(gmu);
/* Tell RPMh to power off the GPU */
a6xx_rpmh_stop(gmu);
}
int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu)
{
struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
u32 val;
/*
* The GMU may still be in slumber unless the GPU started so check and
* skip putting it back into slumber if so
*/
val = gmu_read(gmu, REG_A6XX_GPU_GMU_CX_GMU_RPMH_POWER_STATE);
if (val != 0xf) {
int ret = a6xx_gmu_wait_for_idle(a6xx_gpu);
/* Temporary until we can recover safely */
BUG_ON(ret);
/* tell the GMU we want to slumber */
a6xx_gmu_notify_slumber(gmu);
ret = gmu_poll_timeout(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS, val,
!(val & A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS_GPUBUSYIGNAHB),
100, 10000);
/*
* Let the user know we failed to slumber but don't worry too
* much because we are powering down anyway
*/
if (ret)
dev_err(gmu->dev,
"Unable to slumber GMU: status = 0%x/0%x\n",
gmu_read(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS),
gmu_read(gmu,
REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_STATUS2));
}
/* Turn off HFI */
a6xx_hfi_stop(gmu);
/* Stop the interrupts and mask the hardware */
a6xx_gmu_irq_disable(gmu);
/* Tell RPMh to power off the GPU */
a6xx_rpmh_stop(gmu);
clk_bulk_disable_unprepare(gmu->nr_clocks, gmu->clocks);
pm_runtime_put_sync(gmu->dev);
return 0;
}
