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 v3d_clean_caches(v3d); 56 57 /* Wait until V3D has no active or pending AXI transactions. */ 58 v3d_idle_axi(v3d, 0); 59 v3d_idle_gca(v3d); 60 61 ret = v3d_suspend_sms(v3d); 62 if (ret) { 63 /* Staying active: undo the GMP STOP_REQ from v3d_idle_axi(). */ 64 V3D_WRITE(V3D_GMP_CFG(v3d->ver), 65 V3D_READ(V3D_GMP_CFG(v3d->ver)) & ~V3D_GMP_CFG_STOP_REQ); 66 v3d_irq_enable(v3d); 67 return ret; 68 } 69 70 clk_disable_unprepare(v3d->clk); 71 72 return 0; 73 } 74 75 int v3d_power_resume(struct device *dev) 76 { 77 struct drm_device *drm = dev_get_drvdata(dev); 78 struct v3d_dev *v3d = to_v3d_dev(drm); 79 int ret; 80 81 ret = clk_prepare_enable(v3d->clk); 82 if (ret) 83 return ret; 84 85 ret = v3d_resume_sms(v3d); 86 if (ret) { 87 clk_disable_unprepare(v3d->clk); 88 return ret; 89 } 90 91 v3d_init_hw_state(v3d); 92 v3d_mmu_set_page_table(v3d); 93 v3d_irq_enable(v3d); 94 95 return 0; 96 } 97