--- /dev/null
+/*
+ * hda_i915.c - routines for Haswell HDA controller power well support
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/component.h>
+#include <drm/i915_component.h>
+#include <sound/core.h>
+#include "hda_controller.h"
+#include "hda_intel.h"
+
+/* Intel HSW/BDW display HDA controller Extended Mode registers.
+ * EM4 (M value) and EM5 (N Value) are used to convert CDClk (Core Display
+ * Clock) to 24MHz BCLK: BCLK = CDCLK * M / N
+ * The values will be lost when the display power well is disabled.
+ */
+#define AZX_REG_EM4 0x100c
+#define AZX_REG_EM5 0x1010
+
+int hda_display_power(struct hda_intel *hda, bool enable)
+{
+ struct i915_audio_component *acomp = &hda->audio_component;
+
+ if (!acomp->ops)
+ return -ENODEV;
+
+ dev_dbg(&hda->chip.pci->dev, "display power %s\n",
+ enable ? "enable" : "disable");
+ if (enable)
+ acomp->ops->get_power(acomp->dev);
+ else
+ acomp->ops->put_power(acomp->dev);
+
+ return 0;
+}
+
+void haswell_set_bclk(struct hda_intel *hda)
+{
+ int cdclk_freq;
+ unsigned int bclk_m, bclk_n;
+ struct i915_audio_component *acomp = &hda->audio_component;
+ struct pci_dev *pci = hda->chip.pci;
+
+ /* Only Haswell/Broadwell need set BCLK */
+ if (pci->device != 0x0a0c && pci->device != 0x0c0c
+ && pci->device != 0x0d0c && pci->device != 0x160c)
+ return;
+
+ if (!acomp->ops)
+ return;
+
+ cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
+ switch (cdclk_freq) {
+ case 337500:
+ bclk_m = 16;
+ bclk_n = 225;
+ break;
+
+ case 450000:
+ default: /* default CDCLK 450MHz */
+ bclk_m = 4;
+ bclk_n = 75;
+ break;
+
+ case 540000:
+ bclk_m = 4;
+ bclk_n = 90;
+ break;
+
+ case 675000:
+ bclk_m = 8;
+ bclk_n = 225;
+ break;
+ }
+
+ azx_writew(&hda->chip, EM4, bclk_m);
+ azx_writew(&hda->chip, EM5, bclk_n);
+}
+
+static int hda_component_master_bind(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ struct azx *chip = card->private_data;
+ struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
+ struct i915_audio_component *acomp = &hda->audio_component;
+ int ret;
+
+ ret = component_bind_all(dev, acomp);
+ if (ret < 0)
+ return ret;
+
+ if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
+ acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
+ ret = -EINVAL;
+ goto out_unbind;
+ }
+
+ /*
+ * Atm, we don't support dynamic unbinding initiated by the child
+ * component, so pin its containing module until we unbind.
+ */
+ if (!try_module_get(acomp->ops->owner)) {
+ ret = -ENODEV;
+ goto out_unbind;
+ }
+
+ return 0;
+
+out_unbind:
+ component_unbind_all(dev, acomp);
+
+ return ret;
+}
+
+static void hda_component_master_unbind(struct device *dev)
+{
+ struct snd_card *card = dev_get_drvdata(dev);
+ struct azx *chip = card->private_data;
+ struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
+ struct i915_audio_component *acomp = &hda->audio_component;
+
+ module_put(acomp->ops->owner);
+ component_unbind_all(dev, acomp);
+ WARN_ON(acomp->ops || acomp->dev);
+}
+
+static const struct component_master_ops hda_component_master_ops = {
+ .bind = hda_component_master_bind,
+ .unbind = hda_component_master_unbind,
+};
+
+static int hda_component_master_match(struct device *dev, void *data)
+{
+ /* i915 is the only supported component */
+ return !strcmp(dev->driver->name, "i915");
+}
+
+int hda_i915_init(struct hda_intel *hda)
+{
+ struct component_match *match = NULL;
+ struct device *dev = &hda->chip.pci->dev;
+ struct i915_audio_component *acomp = &hda->audio_component;
+ int ret;
+
+ component_match_add(dev, &match, hda_component_master_match, hda);
+ ret = component_master_add_with_match(dev, &hda_component_master_ops,
+ match);
+ if (ret < 0)
+ goto out_err;
+
+ /*
+ * Atm, we don't support deferring the component binding, so make sure
+ * i915 is loaded and that the binding successfully completes.
+ */
+ request_module("i915");
+
+ if (!acomp->ops) {
+ ret = -ENODEV;
+ goto out_master_del;
+ }
+
+ dev_dbg(dev, "bound to i915 component master\n");
+
+ return 0;
+out_master_del:
+ component_master_del(dev, &hda_component_master_ops);
+out_err:
+ dev_err(dev, "failed to add i915 component master (%d)\n", ret);
+
+ return ret;
+}
+
+int hda_i915_exit(struct hda_intel *hda)
+{
+ struct device *dev = &hda->chip.pci->dev;
+
+ component_master_del(dev, &hda_component_master_ops);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff