/* 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_reset(struct a6xx_gpu *a6xx_gpu)
{
struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
int ret;
u32 val;
/* Flush all the queues */
a6xx_hfi_stop(gmu);
/* Stop the interrupts */
a6xx_gmu_irq_disable(gmu);
/* Force off SPTP in case the GMU is managing it */
a6xx_sptprac_disable(gmu);
/* Make sure there are no outstanding RPMh votes */
gmu_poll_timeout(gmu, REG_A6XX_RSCC_TCS0_DRV0_STATUS, val,
(val & 1), 100, 10000);
gmu_poll_timeout(gmu, REG_A6XX_RSCC_TCS1_DRV0_STATUS, val,
(val & 1), 100, 10000);
gmu_poll_timeout(gmu, REG_A6XX_RSCC_TCS2_DRV0_STATUS, val,
(val & 1), 100, 10000);
gmu_poll_timeout(gmu, REG_A6XX_RSCC_TCS3_DRV0_STATUS, val,
(val & 1), 100, 1000);
/* Force off the GX GSDC */
regulator_force_disable(gmu->gx);
/* Disable the resources */
clk_bulk_disable_unprepare(gmu->nr_clocks, gmu->clocks);
pm_runtime_put_sync(gmu->dev);
/* Re-enable the resources */
pm_runtime_get_sync(gmu->dev);
/* Use a known rate to bring up the GMU */
clk_set_rate(gmu->core_clk, 200000000);
ret = clk_bulk_prepare_enable(gmu->nr_clocks, gmu->clocks);
if (ret)
goto out;
a6xx_gmu_irq_enable(gmu);
ret = a6xx_gmu_fw_start(gmu, GMU_RESET);
if (!ret)
ret = a6xx_hfi_start(gmu, GMU_COLD_BOOT);
/* Set the GPU back to the highest power frequency */
a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
out:
if (ret)
a6xx_gmu_clear_oob(gmu, GMU_OOB_BOOT_SLUMBER);
return ret;
}
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;
}
/* Force the GMU off in case it isn't responsive */
static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
{
/* Flush all the queues */
a6xx_hfi_stop(gmu);
/* Stop the interrupts */
a6xx_gmu_irq_disable(gmu);
/* Force off SPTP in case the GMU is managing it */
a6xx_sptprac_disable(gmu);
/* Make sure there are no outstanding RPMh votes */
a6xx_gmu_rpmh_off(gmu);
}
