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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2026 Raspberry Pi */
#include <linux/clk.h>
#include <drm/drm_print.h>
#include "v3d_drv.h"
#include "v3d_regs.h"
static int
v3d_resume_sms(struct v3d_dev *v3d)
{
if (v3d->ver < V3D_GEN_71)
return 0;
V3D_SMS_WRITE(V3D_SMS_TEE_CS, V3D_SMS_CLEAR_POWER_OFF);
if (wait_for((V3D_GET_FIELD(V3D_SMS_READ(V3D_SMS_TEE_CS),
V3D_SMS_STATE) == V3D_SMS_IDLE), 100)) {
drm_err(&v3d->drm, "Failed to power up SMS\n");
return -ETIMEDOUT;
}
v3d_reset_sms(v3d);
return 0;
}
static int
v3d_suspend_sms(struct v3d_dev *v3d)
{
if (v3d->ver < V3D_GEN_71)
return 0;
V3D_SMS_WRITE(V3D_SMS_TEE_CS, V3D_SMS_POWER_OFF);
if (wait_for((V3D_GET_FIELD(V3D_SMS_READ(V3D_SMS_TEE_CS),
V3D_SMS_STATE) == V3D_SMS_POWER_OFF_STATE), 100)) {
drm_err(&v3d->drm, "Failed to power off SMS\n");
return -ETIMEDOUT;
}
return 0;
}
int v3d_power_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct v3d_dev *v3d = to_v3d_dev(drm);
int ret;
v3d_irq_disable(v3d);
v3d_clean_caches(v3d);
/* Wait until V3D has no active or pending AXI transactions. */
v3d_idle_axi(v3d, 0);
v3d_idle_gca(v3d);
ret = v3d_suspend_sms(v3d);
if (ret) {
/* Staying active: undo the GMP STOP_REQ from v3d_idle_axi(). */
V3D_WRITE(V3D_GMP_CFG(v3d->ver),
V3D_READ(V3D_GMP_CFG(v3d->ver)) & ~V3D_GMP_CFG_STOP_REQ);
v3d_irq_enable(v3d);
return ret;
}
clk_disable_unprepare(v3d->clk);
return 0;
}
int v3d_power_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct v3d_dev *v3d = to_v3d_dev(drm);
int ret;
ret = clk_prepare_enable(v3d->clk);
if (ret)
return ret;
ret = v3d_resume_sms(v3d);
if (ret) {
clk_disable_unprepare(v3d->clk);
return ret;
}
v3d_init_hw_state(v3d);
v3d_mmu_set_page_table(v3d);
v3d_irq_enable(v3d);
return 0;
}
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