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_perfmon_suspend(v3d); 54 55 v3d_irq_disable(v3d); 56 57 v3d_clean_caches(v3d); 58 59 /* Wait until V3D has no active or pending AXI transactions. */ 60 v3d_idle_axi(v3d, 0); 61 v3d_idle_gca(v3d); 62 63 ret = v3d_suspend_sms(v3d); 64 if (ret) { 65 /* Staying active: undo the GMP STOP_REQ from v3d_idle_axi(). */ 66 V3D_WRITE(V3D_GMP_CFG(v3d->ver), 67 V3D_READ(V3D_GMP_CFG(v3d->ver)) & ~V3D_GMP_CFG_STOP_REQ); 68 v3d_irq_enable(v3d); 69 return ret; 70 } 71 72 clk_disable_unprepare(v3d->clk); 73 74 return 0; 75 } 76 77 int v3d_power_resume(struct device *dev) 78 { 79 struct drm_device *drm = dev_get_drvdata(dev); 80 struct v3d_dev *v3d = to_v3d_dev(drm); 81 int ret; 82 83 ret = clk_prepare_enable(v3d->clk); 84 if (ret) 85 return ret; 86 87 ret = v3d_resume_sms(v3d); 88 if (ret) { 89 clk_disable_unprepare(v3d->clk); 90 return ret; 91 } 92 93 v3d_init_hw_state(v3d); 94 v3d_mmu_set_page_table(v3d); 95 v3d_irq_enable(v3d); 96 97 v3d_perfmon_resume(v3d); 98 99 return 0; 100 } 101