Hi Tarun, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on v4.18-rc1 next-20180622] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Tarun-Vyas/drm-i915-Wait-for-PSR-exit-before-checking-for-vblank-evasion/20180622-175933 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-x009-201824 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:10:0, from include/linux/list.h:9, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu//drm/i915/intel_sprite.c:32: drivers/gpu//drm/i915/intel_sprite.c: In function 'intel_pipe_update_start': drivers/gpu//drm/i915/intel_sprite.c:121:6: error: implicit declaration of function 'intel_psr_wait_for_idle'; did you mean 'i915_gem_wait_for_idle'? [-Werror=implicit-function-declaration] if (intel_psr_wait_for_idle(dev_priv)) ^ include/linux/compiler.h:58:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ >> drivers/gpu//drm/i915/intel_sprite.c:121:2: note: in expansion of macro 'if' if (intel_psr_wait_for_idle(dev_priv)) ^~ cc1: some warnings being treated as errors vim +/if +121 drivers/gpu//drm/i915/intel_sprite.c > 32 #include <drm/drmP.h> 33 #include <drm/drm_atomic_helper.h> 34 #include <drm/drm_crtc.h> 35 #include <drm/drm_fourcc.h> 36 #include <drm/drm_rect.h> 37 #include <drm/drm_atomic.h> 38 #include <drm/drm_plane_helper.h> 39 #include "intel_drv.h" 40 #include "intel_frontbuffer.h" 41 #include <drm/i915_drm.h> 42 #include "i915_drv.h" 43 44 bool intel_format_is_yuv(u32 format) 45 { 46 switch (format) { 47 case DRM_FORMAT_YUYV: 48 case DRM_FORMAT_UYVY: 49 case DRM_FORMAT_VYUY: 50 case DRM_FORMAT_YVYU: 51 case DRM_FORMAT_NV12: 52 return true; 53 default: 54 return false; 55 } 56 } 57 58 int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode, 59 int usecs) 60 { 61 /* paranoia */ 62 if (!adjusted_mode->crtc_htotal) 63 return 1; 64 65 return DIV_ROUND_UP(usecs * adjusted_mode->crtc_clock, 66 1000 * adjusted_mode->crtc_htotal); 67 } 68 69 /* FIXME: We should instead only take spinlocks once for the entire update 70 * instead of once per mmio. */ 71 #if IS_ENABLED(CONFIG_PROVE_LOCKING) 72 #define VBLANK_EVASION_TIME_US 250 73 #else 74 #define VBLANK_EVASION_TIME_US 100 75 #endif 76 77 /** 78 * intel_pipe_update_start() - start update of a set of display registers 79 * @new_crtc_state: the new crtc state 80 * 81 * Mark the start of an update to pipe registers that should be updated 82 * atomically regarding vblank. If the next vblank will happens within 83 * the next 100 us, this function waits until the vblank passes. 84 * 85 * After a successful call to this function, interrupts will be disabled 86 * until a subsequent call to intel_pipe_update_end(). That is done to 87 * avoid random delays. 88 */ 89 void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state) 90 { 91 struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc); 92 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); 93 const struct drm_display_mode *adjusted_mode = &new_crtc_state->base.adjusted_mode; 94 long timeout = msecs_to_jiffies_timeout(1); 95 int scanline, min, max, vblank_start; 96 wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base); 97 bool need_vlv_dsi_wa = (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) && 98 intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI); 99 DEFINE_WAIT(wait); 100 101 vblank_start = adjusted_mode->crtc_vblank_start; 102 if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) 103 vblank_start = DIV_ROUND_UP(vblank_start, 2); 104 105 /* FIXME needs to be calibrated sensibly */ 106 min = vblank_start - intel_usecs_to_scanlines(adjusted_mode, 107 VBLANK_EVASION_TIME_US); 108 max = vblank_start - 1; 109 110 if (min <= 0 || max <= 0) 111 return; 112 113 if (WARN_ON(drm_crtc_vblank_get(&crtc->base))) 114 return; 115 116 /* 117 * Wait for psr to idle out after enabling the VBL interrupts 118 * VBL interrupts will start the PSR exit and prevent a PSR 119 * re-entry as well. 120 */ > 121 if (intel_psr_wait_for_idle(dev_priv)) 122 DRM_ERROR("PSR idle timed out, atomic update may fail\n"); 123 124 local_irq_disable(); 125 126 crtc->debug.min_vbl = min; 127 crtc->debug.max_vbl = max; 128 trace_i915_pipe_update_start(crtc); 129 130 for (;;) { 131 /* 132 * prepare_to_wait() has a memory barrier, which guarantees 133 * other CPUs can see the task state update by the time we 134 * read the scanline. 135 */ 136 prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE); 137 138 scanline = intel_get_crtc_scanline(crtc); 139 if (scanline < min || scanline > max) 140 break; 141 142 if (!timeout) { 143 DRM_ERROR("Potential atomic update failure on pipe %c\n", 144 pipe_name(crtc->pipe)); 145 break; 146 } 147 148 local_irq_enable(); 149 150 timeout = schedule_timeout(timeout); 151 152 local_irq_disable(); 153 } 154 155 finish_wait(wq, &wait); 156 157 drm_crtc_vblank_put(&crtc->base); 158 159 /* 160 * On VLV/CHV DSI the scanline counter would appear to 161 * increment approx. 1/3 of a scanline before start of vblank. 162 * The registers still get latched at start of vblank however. 163 * This means we must not write any registers on the first 164 * line of vblank (since not the whole line is actually in 165 * vblank). And unfortunately we can't use the interrupt to 166 * wait here since it will fire too soon. We could use the 167 * frame start interrupt instead since it will fire after the 168 * critical scanline, but that would require more changes 169 * in the interrupt code. So for now we'll just do the nasty 170 * thing and poll for the bad scanline to pass us by. 171 * 172 * FIXME figure out if BXT+ DSI suffers from this as well 173 */ 174 while (need_vlv_dsi_wa && scanline == vblank_start) 175 scanline = intel_get_crtc_scanline(crtc); 176 177 crtc->debug.scanline_start = scanline; 178 crtc->debug.start_vbl_time = ktime_get(); 179 crtc->debug.start_vbl_count = intel_crtc_get_vblank_counter(crtc); 180 181 trace_i915_pipe_update_vblank_evaded(crtc); 182 } 183 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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