drivers/gpu/drm/tidss/tidss_irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
   4  * Author: Tomi Valkeinen <[email protected]>
   5  */
   6
   7 #include <linux/platform_device.h>
   8
   9 #include <drm/drm_drv.h>
  10 #include <drm/drm_print.h>
  11
  12 #include "tidss_crtc.h"
  13 #include "tidss_dispc.h"
  14 #include "tidss_drv.h"
  15 #include "tidss_irq.h"
  16 #include "tidss_plane.h"
  17
  18 static void tidss_irq_update(struct tidss_device *tidss)
  19 {
  20         assert_spin_locked(&tidss->irq_lock);
  21
  22         dispc_set_irqenable(tidss->dispc, tidss->irq_mask);
  23 }
  24
  25 void tidss_irq_enable_vblank(struct drm_crtc *crtc)
  26 {
  27         struct drm_device *ddev = crtc->dev;
  28         struct tidss_device *tidss = to_tidss(ddev);
  29         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  30         u32 hw_videoport = tcrtc->hw_videoport;
  31         unsigned long flags;
  32
  33         spin_lock_irqsave(&tidss->irq_lock, flags);
  34         tidss->irq_mask |= DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
  35                            DSS_IRQ_VP_VSYNC_ODD(hw_videoport);
  36         tidss_irq_update(tidss);
  37         spin_unlock_irqrestore(&tidss->irq_lock, flags);
  38 }
  39
  40 void tidss_irq_disable_vblank(struct drm_crtc *crtc)
  41 {
  42         struct drm_device *ddev = crtc->dev;
  43         struct tidss_device *tidss = to_tidss(ddev);
  44         struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  45         u32 hw_videoport = tcrtc->hw_videoport;
  46         unsigned long flags;
  47
  48         spin_lock_irqsave(&tidss->irq_lock, flags);
  49         tidss->irq_mask &= ~(DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
  50                              DSS_IRQ_VP_VSYNC_ODD(hw_videoport));
  51         tidss_irq_update(tidss);
  52         spin_unlock_irqrestore(&tidss->irq_lock, flags);
  53 }
  54
  55 static irqreturn_t tidss_irq_handler(int irq, void *arg)
  56 {
  57         struct drm_device *ddev = (struct drm_device *)arg;
  58         struct tidss_device *tidss = to_tidss(ddev);
  59         unsigned int id;
  60         dispc_irq_t irqstatus;
  61
  62         spin_lock(&tidss->irq_lock);
  63         irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc);
  64         spin_unlock(&tidss->irq_lock);
  65
  66         for (id = 0; id < tidss->num_crtcs; id++) {
  67                 struct drm_crtc *crtc = tidss->crtcs[id];
  68                 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
  69                 u32 hw_videoport = tcrtc->hw_videoport;
  70
  71                 if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
  72                                  DSS_IRQ_VP_VSYNC_ODD(hw_videoport)))
  73                         tidss_crtc_vblank_irq(crtc);
  74
  75                 if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport)))
  76                         tidss_crtc_framedone_irq(crtc);
  77
  78                 if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport))
  79                         tidss_crtc_error_irq(crtc, irqstatus);
  80         }
  81
  82         for (unsigned int i = 0; i < tidss->num_planes; ++i) {
  83                 struct drm_plane *plane = tidss->planes[i];
  84                 struct tidss_plane *tplane = to_tidss_plane(plane);
  85
  86                 if (irqstatus & DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id))
  87                         tidss_plane_error_irq(plane, irqstatus);
  88         }
  89
  90         return IRQ_HANDLED;
  91 }
  92
  93 void tidss_irq_resume(struct tidss_device *tidss)
  94 {
  95         unsigned long flags;
  96
  97         spin_lock_irqsave(&tidss->irq_lock, flags);
  98         tidss_irq_update(tidss);
  99         spin_unlock_irqrestore(&tidss->irq_lock, flags);
 100 }
 101
 102 int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
 103 {
 104         struct tidss_device *tidss = to_tidss(ddev);
 105         int ret;
 106
 107         if (irq == IRQ_NOTCONNECTED)
 108                 return -ENOTCONN;
 109
 110         ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
 111         if (ret)
 112                 return ret;
 113
 114         tidss->irq_mask = 0;
 115
 116         for (unsigned int i = 0; i < tidss->num_crtcs; ++i) {
 117                 struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]);
 118
 119                 tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport);
 120
 121                 tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport);
 122         }
 123
 124         for (unsigned int i = 0; i < tidss->num_planes; ++i) {
 125                 struct tidss_plane *tplane = to_tidss_plane(tidss->planes[i]);
 126
 127                 tidss->irq_mask |= DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id);
 128         }
 129
 130         return 0;
 131 }
 132
 133 void tidss_irq_uninstall(struct drm_device *ddev)
 134 {
 135         struct tidss_device *tidss = to_tidss(ddev);
 136
 137         free_irq(tidss->irq, ddev);
 138 }