Initial import

1 files changed, 196 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_i915.c b/sound/pci/hda/hda_i915.c
new file mode 100644
index 000000000..3052a2b09
--- /dev/null
+++ b/sound/pci/hda/hda_i915.c
@@ -0,0 +1,196 @@
+/*
+ *  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;
+}