drivers/gpu/drm/msm/mdp/mdp5/mdp5_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 #include <linux/irq.h>
  19
  20 #include "msm_drv.h"
  21 #include "mdp5_kms.h"
  22
  23 void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
  24                 uint32_t old_irqmask)
  25 {
  26         mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_INTR_CLEAR,
  27                    irqmask ^ (irqmask & old_irqmask));
  28         mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_INTR_EN, irqmask);
  29 }
  30
  31 static void mdp5_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
  32 {
  33         DRM_ERROR_RATELIMITED("errors: %08x\n", irqstatus);
  34 }
  35
  36 void mdp5_irq_preinstall(struct msm_kms *kms)
  37 {
  38         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
  39         mdp5_enable(mdp5_kms);
  40         mdp5_write(mdp5_kms, REG_MDP5_INTR_CLEAR, 0xffffffff);
  41         mdp5_write(mdp5_kms, REG_MDP5_INTR_EN, 0x00000000);
  42         mdp5_disable(mdp5_kms);
  43 }
  44
  45 int mdp5_irq_postinstall(struct msm_kms *kms)
  46 {
  47         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  48         struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
  49         struct mdp_irq *error_handler = &mdp5_kms->error_handler;
  50
  51         error_handler->irq = mdp5_irq_error_handler;
  52         error_handler->irqmask = MDP5_IRQ_INTF0_UNDER_RUN |
  53                         MDP5_IRQ_INTF1_UNDER_RUN |
  54                         MDP5_IRQ_INTF2_UNDER_RUN |
  55                         MDP5_IRQ_INTF3_UNDER_RUN;
  56
  57         mdp5_enable(mdp5_kms);
  58         mdp_irq_register(mdp_kms, error_handler);
  59         mdp5_disable(mdp5_kms);
  60
  61         return 0;
  62 }
  63
  64 void mdp5_irq_uninstall(struct msm_kms *kms)
  65 {
  66         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
  67         mdp5_enable(mdp5_kms);
  68         mdp5_write(mdp5_kms, REG_MDP5_INTR_EN, 0x00000000);
  69         mdp5_disable(mdp5_kms);
  70 }
  71
  72 irqreturn_t mdp5_irq(struct msm_kms *kms)
  73 {
  74         struct mdp_kms *mdp_kms = to_mdp_kms(kms);
  75         struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
  76         struct drm_device *dev = mdp5_kms->dev;
  77         struct msm_drm_private *priv = dev->dev_private;
  78         unsigned int id;
  79         uint32_t status, enable;
  80
  81         enable = mdp5_read(mdp5_kms, REG_MDP5_INTR_EN);
  82         status = mdp5_read(mdp5_kms, REG_MDP5_INTR_STATUS) & enable;
  83         mdp5_write(mdp5_kms, REG_MDP5_INTR_CLEAR, status);
  84
  85         VERB("status=%08x", status);
  86
  87         mdp_dispatch_irqs(mdp_kms, status);
  88
  89         for (id = 0; id < priv->num_crtcs; id++)
  90                 if (status & mdp5_crtc_vblank(priv->crtcs[id]))
  91                         drm_handle_vblank(dev, id);
  92
  93         return IRQ_HANDLED;
  94 }
  95
  96 int mdp5_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
  97 {
  98         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
  99
 100         mdp5_enable(mdp5_kms);
 101         mdp_update_vblank_mask(to_mdp_kms(kms),
 102                         mdp5_crtc_vblank(crtc), true);
 103         mdp5_disable(mdp5_kms);
 104
 105         return 0;
 106 }
 107
 108 void mdp5_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 109 {
 110         struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
 111
 112         mdp5_enable(mdp5_kms);
 113         mdp_update_vblank_mask(to_mdp_kms(kms),
 114                         mdp5_crtc_vblank(crtc), false);
 115         mdp5_disable(mdp5_kms);
 116 }