1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (C) 2026 Raspberry Pi */ 3 4 #include <linux/clk.h> 5 6 #include <drm/drm_print.h> 7 8 #include "v3d_drv.h" 9 #include "v3d_regs.h" 10 11 static int 12 v3d_resume_sms(struct v3d_dev *v3d) 13 { 14 if (v3d->ver < V3D_GEN_71) 15 return 0; 16 17 V3D_SMS_WRITE(V3D_SMS_TEE_CS, V3D_SMS_CLEAR_POWER_OFF); 18 19 if (wait_for((V3D_GET_FIELD(V3D_SMS_READ(V3D_SMS_TEE_CS), 20 V3D_SMS_STATE) == V3D_SMS_IDLE), 100)) { 21 drm_err(&v3d->drm, "Failed to power up SMS\n"); 22 return -ETIMEDOUT; 23 } 24 25 v3d_reset_sms(v3d); 26 27 return 0; 28 } 29 30 static int 31 v3d_suspend_sms(struct v3d_dev *v3d) 32 { 33 if (v3d->ver < V3D_GEN_71) 34 return 0; 35 36 V3D_SMS_WRITE(V3D_SMS_TEE_CS, V3D_SMS_POWER_OFF); 37 38 if (wait_for((V3D_GET_FIELD(V3D_SMS_READ(V3D_SMS_TEE_CS), 39 V3D_SMS_STATE) == V3D_SMS_POWER_OFF_STATE), 100)) { 40 drm_err(&v3d->drm, "Failed to power off SMS\n"); 41 return -ETIMEDOUT; 42 } 43 44 return 0; 45 } 46 47 int v3d_power_suspend(struct device *dev) 48 { 49 struct drm_device *drm = dev_get_drvdata(dev); 50 struct v3d_dev *v3d = to_v3d_dev(drm); 51 int ret; 52 53 v3d_irq_disable(v3d); 54 55 ret = v3d_suspend_sms(v3d); 56 if (ret) { 57 v3d_irq_enable(v3d); 58 return ret; 59 } 60 61 clk_disable_unprepare(v3d->clk); 62 63 return 0; 64 } 65 66 int v3d_power_resume(struct device *dev) 67 { 68 struct drm_device *drm = dev_get_drvdata(dev); 69 struct v3d_dev *v3d = to_v3d_dev(drm); 70 int ret; 71 72 ret = clk_prepare_enable(v3d->clk); 73 if (ret) 74 return ret; 75 76 ret = v3d_resume_sms(v3d); 77 if (ret) { 78 clk_disable_unprepare(v3d->clk); 79 return ret; 80 } 81 82 v3d_init_hw_state(v3d); 83 v3d_mmu_set_page_table(v3d); 84 v3d_irq_enable(v3d); 85 86 return 0; 87 } 88