DRM: i915: add mode setting support

This commit adds i915 driver support for the DRM mode setting APIs.
Currently, VGA, LVDS, SDVO DVI & VGA, TV and DVO LVDS outputs are
supported.  HDMI, DisplayPort and additional SDVO output support will
follow.

Support for the mode setting code is controlled by the new 'modeset'
module option.  A new config option, CONFIG_DRM_I915_KMS controls the
default behavior, and whether a PCI ID list is built into the module for
use by user level module utilities.

Note that if mode setting is enabled, user level drivers that access
display registers directly or that don't use the kernel graphics memory
manager will likely corrupt kernel graphics memory, disrupt output
configuration (possibly leading to hangs and/or blank displays), and
prevent panic/oops messages from appearing.  So use caution when
enabling this code; be sure your user level code supports the new
interfaces.

A new SysRq key, 'g', provides emergency support for switching back to
the kernel's framebuffer console; which is useful for testing.

Co-authors: Dave Airlie <airlied@linux.ie>, Hong Liu <hong.liu@intel.com>

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 284 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
new file mode 100644
index 00000000000..5d9c94eb705
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -0,0 +1,284 @@
+/*
+ * Copyright © 2006-2007 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>
+ */
+
+#include <linux/i2c.h>
+#include "drmP.h"
+#include "drm.h"
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+#include "intel_drv.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
+{
+        struct drm_device *dev = encoder->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 temp;
+
+        temp = I915_READ(ADPA);
+        temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
+        temp &= ~ADPA_DAC_ENABLE;
+
+        switch(mode) {
+        case DRM_MODE_DPMS_ON:
+                temp |= ADPA_DAC_ENABLE;
+                break;
+        case DRM_MODE_DPMS_STANDBY:
+                temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
+                break;
+        case DRM_MODE_DPMS_SUSPEND:
+                temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
+                break;
+        case DRM_MODE_DPMS_OFF:
+                temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
+                break;
+        }
+
+        I915_WRITE(ADPA, temp);
+}
+
+static int intel_crt_mode_valid(struct drm_connector *connector,
+                                struct drm_display_mode *mode)
+{
+        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+                return MODE_NO_DBLESCAN;
+
+        if (mode->clock > 400000 || mode->clock < 25000)
+                return MODE_CLOCK_RANGE;
+
+        return MODE_OK;
+}
+
+static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
+                                 struct drm_display_mode *mode,
+                                 struct drm_display_mode *adjusted_mode)
+{
+        return true;
+}
+
+static void intel_crt_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_crtc *crtc = encoder->crtc;
+        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        int dpll_md_reg;
+        u32 adpa, dpll_md;
+
+        if (intel_crtc->pipe == 0)
+                dpll_md_reg = DPLL_A_MD;
+        else
+                dpll_md_reg = DPLL_B_MD;
+
+        /*
+         * Disable separate mode multiplier used when cloning SDVO to CRT
+         * XXX this needs to be adjusted when we really are cloning
+         */
+        if (IS_I965G(dev)) {
+                dpll_md = I915_READ(dpll_md_reg);
+                I915_WRITE(dpll_md_reg,
+                           dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
+        }
+
+        adpa = 0;
+        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
+                adpa |= ADPA_HSYNC_ACTIVE_HIGH;
+        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
+                adpa |= ADPA_VSYNC_ACTIVE_HIGH;
+
+        if (intel_crtc->pipe == 0)
+                adpa |= ADPA_PIPE_A_SELECT;
+        else
+                adpa |= ADPA_PIPE_B_SELECT;
+
+        I915_WRITE(ADPA, adpa);
+}
+
+/**
+ * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
+ *
+ * Not for i915G/i915GM
+ *
+ * \return true if CRT is connected.
+ * \return false if CRT is disconnected.
+ */
+static bool intel_crt_detect_hotplug(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 temp;
+
+        unsigned long timeout = jiffies + msecs_to_jiffies(1000);
+
+        temp = I915_READ(PORT_HOTPLUG_EN);
+
+        I915_WRITE(PORT_HOTPLUG_EN,
+                   temp | CRT_HOTPLUG_FORCE_DETECT | (1 << 5));
+
+        do {
+                if (!(I915_READ(PORT_HOTPLUG_EN) & CRT_HOTPLUG_FORCE_DETECT))
+                        break;
+                msleep(1);
+        } while (time_after(timeout, jiffies));
+
+        if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) ==
+            CRT_HOTPLUG_MONITOR_COLOR)
+                return true;
+
+        return false;
+}
+
+static bool intel_crt_detect_ddc(struct drm_connector *connector)
+{
+        struct intel_output *intel_output = to_intel_output(connector);
+
+        /* CRT should always be at 0, but check anyway */
+        if (intel_output->type != INTEL_OUTPUT_ANALOG)
+                return false;
+
+        return intel_ddc_probe(intel_output);
+}
+
+static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+
+        if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
+                if (intel_crt_detect_hotplug(connector))
+                        return connector_status_connected;
+                else
+                        return connector_status_disconnected;
+        }
+
+        if (intel_crt_detect_ddc(connector))
+                return connector_status_connected;
+
+        /* TODO use load detect */
+        return connector_status_unknown;
+}
+
+static void intel_crt_destroy(struct drm_connector *connector)
+{
+        struct intel_output *intel_output = to_intel_output(connector);
+
+        intel_i2c_destroy(intel_output->ddc_bus);
+        drm_sysfs_connector_remove(connector);
+        drm_connector_cleanup(connector);
+        kfree(connector);
+}
+
+static int intel_crt_get_modes(struct drm_connector *connector)
+{
+        struct intel_output *intel_output = to_intel_output(connector);
+        return intel_ddc_get_modes(intel_output);
+}
+
+static int intel_crt_set_property(struct drm_connector *connector,
+                                  struct drm_property *property,
+                                  uint64_t value)
+{
+        struct drm_device *dev = connector->dev;
+
+        if (property == dev->mode_config.dpms_property && connector->encoder)
+                intel_crt_dpms(connector->encoder, (uint32_t)(value & 0xf));
+
+        return 0;
+}
+
+/*
+ * Routines for controlling stuff on the analog port
+ */
+
+static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
+        .dpms = intel_crt_dpms,
+        .mode_fixup = intel_crt_mode_fixup,
+        .prepare = intel_encoder_prepare,
+        .commit = intel_encoder_commit,
+        .mode_set = intel_crt_mode_set,
+};
+
+static const struct drm_connector_funcs intel_crt_connector_funcs = {
+        .detect = intel_crt_detect,
+        .fill_modes = drm_helper_probe_single_connector_modes,
+        .destroy = intel_crt_destroy,
+        .set_property = intel_crt_set_property,
+};
+
+static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
+        .mode_valid = intel_crt_mode_valid,
+        .get_modes = intel_crt_get_modes,
+        .best_encoder = intel_best_encoder,
+};
+
+void intel_crt_enc_destroy(struct drm_encoder *encoder)
+{
+        drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs intel_crt_enc_funcs = {
+        .destroy = intel_crt_enc_destroy,
+};
+
+void intel_crt_init(struct drm_device *dev)
+{
+        struct drm_connector *connector;
+        struct intel_output *intel_output;
+
+        intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
+        if (!intel_output)
+                return;
+
+        connector = &intel_output->base;
+        drm_connector_init(dev, &intel_output->base,
+                           &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
+
+        drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
+                         DRM_MODE_ENCODER_DAC);
+
+        drm_mode_connector_attach_encoder(&intel_output->base,
+                                          &intel_output->enc);
+
+        /* Set up the DDC bus. */
+        intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
+        if (!intel_output->ddc_bus) {
+                dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
+                           "failed.\n");
+                return;
+        }
+
+        intel_output->type = INTEL_OUTPUT_ANALOG;
+        connector->interlace_allowed = 0;
+        connector->doublescan_allowed = 0;
+
+        drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
+        drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
+
+        drm_sysfs_connector_add(connector);
+}