drm/i915: Add support for integrated HDMI on G4X hardware.

This is ported directly from the userland 2D driver code.  The HDMI audio bits
aren't hooked up yet.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 280 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
new file mode 100644
index 000000000000..b06a4a3ff08d
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright 2006 Dave Airlie <airlied@linux.ie>
+ * Copyright © 2006-2009 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *      Eric Anholt <eric@anholt.net>
+ *      Jesse Barnes <jesse.barnes@intel.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include "drmP.h"
+#include "drm.h"
+#include "drm_crtc.h"
+#include "intel_drv.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+struct intel_hdmi_priv {
+        u32 sdvox_reg;
+        u32 save_SDVOX;
+        int has_hdmi_sink;
+};
+
+static void intel_hdmi_mode_set(struct drm_encoder *encoder,
+                                struct drm_display_mode *mode,
+                                struct drm_display_mode *adjusted_mode)
+{
+        struct drm_device *dev = encoder->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct drm_crtc *crtc = encoder->crtc;
+        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+        struct intel_output *intel_output = enc_to_intel_output(encoder);
+        struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
+        u32 sdvox;
+
+        sdvox = SDVO_ENCODING_HDMI |
+                SDVO_BORDER_ENABLE |
+                SDVO_VSYNC_ACTIVE_HIGH |
+                SDVO_HSYNC_ACTIVE_HIGH;
+
+        if (hdmi_priv->has_hdmi_sink)
+                sdvox |= SDVO_AUDIO_ENABLE;
+
+        if (intel_crtc->pipe == 1)
+                sdvox |= SDVO_PIPE_B_SELECT;
+
+        I915_WRITE(hdmi_priv->sdvox_reg, sdvox);
+        POSTING_READ(hdmi_priv->sdvox_reg);
+}
+
+static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
+{
+        struct drm_device *dev = encoder->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_output *intel_output = enc_to_intel_output(encoder);
+        struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
+        u32 temp;
+
+        if (mode != DRM_MODE_DPMS_ON) {
+                temp = I915_READ(hdmi_priv->sdvox_reg);
+                I915_WRITE(hdmi_priv->sdvox_reg, temp & ~SDVO_ENABLE);
+        } else {
+                temp = I915_READ(hdmi_priv->sdvox_reg);
+                I915_WRITE(hdmi_priv->sdvox_reg, temp | SDVO_ENABLE);
+        }
+        POSTING_READ(hdmi_priv->sdvox_reg);
+}
+
+static void intel_hdmi_save(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_output *intel_output = to_intel_output(connector);
+        struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
+
+        hdmi_priv->save_SDVOX = I915_READ(hdmi_priv->sdvox_reg);
+}
+
+static void intel_hdmi_restore(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_output *intel_output = to_intel_output(connector);
+        struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
+
+        I915_WRITE(hdmi_priv->sdvox_reg, hdmi_priv->save_SDVOX);
+        POSTING_READ(hdmi_priv->sdvox_reg);
+}
+
+static int intel_hdmi_mode_valid(struct drm_connector *connector,
+                                 struct drm_display_mode *mode)
+{
+        if (mode->clock > 165000)
+                return MODE_CLOCK_HIGH;
+        if (mode->clock < 20000)
+                return MODE_CLOCK_HIGH;
+
+        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+                return MODE_NO_DBLESCAN;
+
+        return MODE_OK;
+}
+
+static bool intel_hdmi_mode_fixup(struct drm_encoder *encoder,
+                                  struct drm_display_mode *mode,
+                                  struct drm_display_mode *adjusted_mode)
+{
+        return true;
+}
+
+static enum drm_connector_status
+intel_hdmi_detect(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_output *intel_output = to_intel_output(connector);
+        struct intel_hdmi_priv *hdmi_priv = intel_output->dev_priv;
+        u32 temp, bit;
+
+        temp = I915_READ(PORT_HOTPLUG_EN);
+
+        I915_WRITE(PORT_HOTPLUG_EN,
+                   temp |
+                   HDMIB_HOTPLUG_INT_EN |
+                   HDMIC_HOTPLUG_INT_EN |
+                   HDMID_HOTPLUG_INT_EN);
+
+        POSTING_READ(PORT_HOTPLUG_EN);
+
+        switch (hdmi_priv->sdvox_reg) {
+        case SDVOB:
+                bit = HDMIB_HOTPLUG_INT_STATUS;
+                break;
+        case SDVOC:
+                bit = HDMIC_HOTPLUG_INT_STATUS;
+                break;
+        default:
+                return connector_status_unknown;
+        }
+
+        if ((I915_READ(PORT_HOTPLUG_STAT) & bit) != 0)
+                return connector_status_connected;
+        else
+                return connector_status_disconnected;
+}
+
+static int intel_hdmi_get_modes(struct drm_connector *connector)
+{
+        struct intel_output *intel_output = to_intel_output(connector);
+
+        /* We should parse the EDID data and find out if it's an HDMI sink so
+         * we can send audio to it.
+         */
+
+        return intel_ddc_get_modes(intel_output);
+}
+
+static void intel_hdmi_destroy(struct drm_connector *connector)
+{
+        struct intel_output *intel_output = to_intel_output(connector);
+
+        if (intel_output->i2c_bus)
+                intel_i2c_destroy(intel_output->i2c_bus);
+        drm_sysfs_connector_remove(connector);
+        drm_connector_cleanup(connector);
+        kfree(intel_output);
+}
+
+static const struct drm_encoder_helper_funcs intel_hdmi_helper_funcs = {
+        .dpms = intel_hdmi_dpms,
+        .mode_fixup = intel_hdmi_mode_fixup,
+        .prepare = intel_encoder_prepare,
+        .mode_set = intel_hdmi_mode_set,
+        .commit = intel_encoder_commit,
+};
+
+static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
+        .save = intel_hdmi_save,
+        .restore = intel_hdmi_restore,
+        .detect = intel_hdmi_detect,
+        .fill_modes = drm_helper_probe_single_connector_modes,
+        .destroy = intel_hdmi_destroy,
+};
+
+static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
+        .get_modes = intel_hdmi_get_modes,
+        .mode_valid = intel_hdmi_mode_valid,
+        .best_encoder = intel_best_encoder,
+};
+
+static void intel_hdmi_enc_destroy(struct drm_encoder *encoder)
+{
+        drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
+        .destroy = intel_hdmi_enc_destroy,
+};
+
+
+void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct drm_connector *connector;
+        struct intel_output *intel_output;
+        struct intel_hdmi_priv *hdmi_priv;
+
+        intel_output = kcalloc(sizeof(struct intel_output) +
+                               sizeof(struct intel_hdmi_priv), 1, GFP_KERNEL);
+        if (!intel_output)
+                return;
+        hdmi_priv = (struct intel_hdmi_priv *)(intel_output + 1);
+
+        connector = &intel_output->base;
+        drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
+                           DRM_MODE_CONNECTOR_DVID);
+        drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
+
+        intel_output->type = INTEL_OUTPUT_HDMI;
+
+        connector->interlace_allowed = 0;
+        connector->doublescan_allowed = 0;
+
+        /* Set up the DDC bus. */
+        if (sdvox_reg == SDVOB)
+                intel_output->ddc_bus = intel_i2c_create(dev, GPIOE, "HDMIB");
+        else
+                intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "HDMIC");
+
+        if (!intel_output->ddc_bus)
+                goto err_connector;
+
+        hdmi_priv->sdvox_reg = sdvox_reg;
+        intel_output->dev_priv = hdmi_priv;
+
+        drm_encoder_init(dev, &intel_output->enc, &intel_hdmi_enc_funcs,
+                         DRM_MODE_ENCODER_TMDS);
+        drm_encoder_helper_add(&intel_output->enc, &intel_hdmi_helper_funcs);
+
+        drm_mode_connector_attach_encoder(&intel_output->base,
+                                          &intel_output->enc);
+        drm_sysfs_connector_add(connector);
+
+        /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
+         * 0xd.  Failure to do so will result in spurious interrupts being
+         * generated on the port when a cable is not attached.
+         */
+        if (IS_G4X(dev) && !IS_GM45(dev)) {
+                u32 temp = I915_READ(PEG_BAND_GAP_DATA);
+                I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
+        }
+
+        return;
+
+err_connector:
+        drm_connector_cleanup(connector);
+        kfree(intel_output);
+
+        return;
+}