drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18
  19 #include "msm_drv.h"
  20 #include "mdp4_kms.h"
  21
  22 void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
  23                 uint32_t old_irqmask)
  24 {
  25         mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_CLEAR,
  26                 irqmask ^ (irqmask & old_irqmask));
  27         mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_ENABLE, irqmask);
  28 }
  29
  30 static void mdp4_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
  31 {
  32         DRM_ERROR_RATELIMITED("errors: %08x\n", irqstatus);
  33 }
  34
  35 void mdp4_irq_preinstall(struct msm_kms *kms)
  36 {
  37         struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  38         mdp4_enable(mdp4_kms);
  39         mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff);
  40         mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
  41         mdp4_disable(mdp4_kms);
  42 }
  43
  44 int mdp4_irq_postinstall(struct msm_kms *kms)
  45 {
  46         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  47         struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
  48         struct mdp_irq *error_handler = &mdp4_kms->error_handler;
  49
  50         error_handler->irq = mdp4_irq_error_handler;
  51         error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN |
  52                         MDP4_IRQ_EXTERNAL_INTF_UDERRUN;
  53
  54         mdp_irq_register(mdp_kms, error_handler);
  55
  56         return 0;
  57 }
  58
  59 void mdp4_irq_uninstall(struct msm_kms *kms)
  60 {
  61         struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  62         mdp4_enable(mdp4_kms);
  63         mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
  64         mdp4_disable(mdp4_kms);
  65 }
  66
  67 irqreturn_t mdp4_irq(struct msm_kms *kms)
  68 {
  69         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  70         struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
  71         struct drm_device *dev = mdp4_kms->dev;
  72         struct msm_drm_private *priv = dev->dev_private;
  73         unsigned int id;
  74         uint32_t status, enable;
  75
  76         enable = mdp4_read(mdp4_kms, REG_MDP4_INTR_ENABLE);
  77         status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS) & enable;
  78         mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
  79
  80         VERB("status=%08x", status);
  81
  82         mdp_dispatch_irqs(mdp_kms, status);
  83
  84         for (id = 0; id < priv->num_crtcs; id++)
  85                 if (status & mdp4_crtc_vblank(priv->crtcs[id]))
  86                         drm_handle_vblank(dev, id);
  87
  88         return IRQ_HANDLED;
  89 }
  90
  91 int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  92 {
  93         struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
  94
  95         mdp4_enable(mdp4_kms);
  96         mdp_update_vblank_mask(to_mdp_kms(kms),
  97                         mdp4_crtc_vblank(crtc), true);
  98         mdp4_disable(mdp4_kms);
  99
 100         return 0;
 101 }
 102
 103 void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 104 {
 105         struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
 106
 107         mdp4_enable(mdp4_kms);
 108         mdp_update_vblank_mask(to_mdp_kms(kms),
 109                         mdp4_crtc_vblank(crtc), false);
 110         mdp4_disable(mdp4_kms);
 111 }