sound/pci/hda/hda_i915.c

   1 /*
   2  *  hda_i915.c - routines for Haswell HDA controller power well support
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under the terms of the GNU General Public License as published by the Free
   6  *  Software Foundation; either version 2 of the License, or (at your option)
   7  *  any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful, but
  10  *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software Foundation,
  16  *  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/pci.h>
  22 #include <linux/component.h>
  23 #include <drm/i915_component.h>
  24 #include <sound/core.h>
  25 #include "hda_controller.h"
  26 #include "hda_intel.h"
  27
  28 /* Intel HSW/BDW display HDA controller Extended Mode registers.
  29  * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display
  30  * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N
  31  * The values will be lost when the display power well is disabled.
  32  */
  33 #define AZX_REG_EM4                     0x100c
  34 #define AZX_REG_EM5                     0x1010
  35
  36 int hda_display_power(struct hda_intel *hda, bool enable)
  37 {
  38         struct i915_audio_component *acomp = &hda->audio_component;
  39
  40         if (!acomp->ops)
  41                 return -ENODEV;
  42
  43         dev_dbg(&hda->chip.pci->dev, "display power %s\n",
  44                 enable ? "enable" : "disable");
  45         if (enable)
  46                 acomp->ops->get_power(acomp->dev);
  47         else
  48                 acomp->ops->put_power(acomp->dev);
  49
  50         return 0;
  51 }
  52
  53 void haswell_set_bclk(struct hda_intel *hda)
  54 {
  55         int cdclk_freq;
  56         unsigned int bclk_m, bclk_n;
  57         struct i915_audio_component *acomp = &hda->audio_component;
  58         struct pci_dev *pci = hda->chip.pci;
  59
  60         /* Only Haswell/Broadwell need set BCLK */
  61         if (pci->device != 0x0a0c && pci->device != 0x0c0c
  62            && pci->device != 0x0d0c && pci->device != 0x160c)
  63                 return;
  64
  65         if (!acomp->ops)
  66                 return;
  67
  68         cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
  69         switch (cdclk_freq) {
  70         case 337500:
  71                 bclk_m = 16;
  72                 bclk_n = 225;
  73                 break;
  74
  75         case 450000:
  76         default: /* default CDCLK 450MHz */
  77                 bclk_m = 4;
  78                 bclk_n = 75;
  79                 break;
  80
  81         case 540000:
  82                 bclk_m = 4;
  83                 bclk_n = 90;
  84                 break;
  85
  86         case 675000:
  87                 bclk_m = 8;
  88                 bclk_n = 225;
  89                 break;
  90         }
  91
  92         azx_writew(&hda->chip, EM4, bclk_m);
  93         azx_writew(&hda->chip, EM5, bclk_n);
  94 }
  95
  96 static int hda_component_master_bind(struct device *dev)
  97 {
  98         struct snd_card *card = dev_get_drvdata(dev);
  99         struct azx *chip = card->private_data;
 100         struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
 101         struct i915_audio_component *acomp = &hda->audio_component;
 102         int ret;
 103
 104         ret = component_bind_all(dev, acomp);
 105         if (ret < 0)
 106                 return ret;
 107
 108         if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
 109                       acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
 110                 ret = -EINVAL;
 111                 goto out_unbind;
 112         }
 113
 114         /*
 115          * Atm, we don't support dynamic unbinding initiated by the child
 116          * component, so pin its containing module until we unbind.
 117          */
 118         if (!try_module_get(acomp->ops->owner)) {
 119                 ret = -ENODEV;
 120                 goto out_unbind;
 121         }
 122
 123         return 0;
 124
 125 out_unbind:
 126         component_unbind_all(dev, acomp);
 127
 128         return ret;
 129 }
 130
 131 static void hda_component_master_unbind(struct device *dev)
 132 {
 133         struct snd_card *card = dev_get_drvdata(dev);
 134         struct azx *chip = card->private_data;
 135         struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
 136         struct i915_audio_component *acomp = &hda->audio_component;
 137
 138         module_put(acomp->ops->owner);
 139         component_unbind_all(dev, acomp);
 140         WARN_ON(acomp->ops || acomp->dev);
 141 }
 142
 143 static const struct component_master_ops hda_component_master_ops = {
 144         .bind = hda_component_master_bind,
 145         .unbind = hda_component_master_unbind,
 146 };
 147
 148 static int hda_component_master_match(struct device *dev, void *data)
 149 {
 150         /* i915 is the only supported component */
 151         return !strcmp(dev->driver->name, "i915");
 152 }
 153
 154 int hda_i915_init(struct hda_intel *hda)
 155 {
 156         struct component_match *match = NULL;
 157         struct device *dev = &hda->chip.pci->dev;
 158         struct i915_audio_component *acomp = &hda->audio_component;
 159         int ret;
 160
 161         component_match_add(dev, &match, hda_component_master_match, hda);
 162         ret = component_master_add_with_match(dev, &hda_component_master_ops,
 163                                               match);
 164         if (ret < 0)
 165                 goto out_err;
 166
 167         /*
 168          * Atm, we don't support deferring the component binding, so make sure
 169          * i915 is loaded and that the binding successfully completes.
 170          */
 171         request_module("i915");
 172
 173         if (!acomp->ops) {
 174                 ret = -ENODEV;
 175                 goto out_master_del;
 176         }
 177
 178         dev_dbg(dev, "bound to i915 component master\n");
 179
 180         return 0;
 181 out_master_del:
 182         component_master_del(dev, &hda_component_master_ops);
 183 out_err:
 184         dev_err(dev, "failed to add i915 component master (%d)\n", ret);
 185
 186         return ret;
 187 }
 188
 189 int hda_i915_exit(struct hda_intel *hda)
 190 {
 191         struct device *dev = &hda->chip.pci->dev;
 192
 193         component_master_del(dev, &hda_component_master_ops);
 194
 195         return 0;
 196 }