--- /dev/null
+/*
+ * Copyright © 2006 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 "dvo.h"
+
+/*
+ * register definitions for the i82807aa.
+ *
+ * Documentation on this chipset can be found in datasheet #29069001 at
+ * intel.com.
+ */
+
+/*
+ * VCH Revision & GMBus Base Addr
+ */
+#define VR00 0x00
+# define VR00_BASE_ADDRESS_MASK 0x007f
+
+/*
+ * Functionality Enable
+ */
+#define VR01 0x01
+
+/*
+ * Enable the panel fitter
+ */
+# define VR01_PANEL_FIT_ENABLE (1 << 3)
+/*
+ * Enables the LCD display.
+ *
+ * This must not be set while VR01_DVO_BYPASS_ENABLE is set.
+ */
+# define VR01_LCD_ENABLE (1 << 2)
+/** Enables the DVO repeater. */
+# define VR01_DVO_BYPASS_ENABLE (1 << 1)
+/** Enables the DVO clock */
+# define VR01_DVO_ENABLE (1 << 0)
+
+/*
+ * LCD Interface Format
+ */
+#define VR10 0x10
+/** Enables LVDS output instead of CMOS */
+# define VR10_LVDS_ENABLE (1 << 4)
+/** Enables 18-bit LVDS output. */
+# define VR10_INTERFACE_1X18 (0 << 2)
+/** Enables 24-bit LVDS or CMOS output */
+# define VR10_INTERFACE_1X24 (1 << 2)
+/** Enables 2x18-bit LVDS or CMOS output. */
+# define VR10_INTERFACE_2X18 (2 << 2)
+/** Enables 2x24-bit LVDS output */
+# define VR10_INTERFACE_2X24 (3 << 2)
+
+/*
+ * VR20 LCD Horizontal Display Size
+ */
+#define VR20 0x20
+
+/*
+ * LCD Vertical Display Size
+ */
+#define VR21 0x20
+
+/*
+ * Panel power down status
+ */
+#define VR30 0x30
+/** Read only bit indicating that the panel is not in a safe poweroff state. */
+# define VR30_PANEL_ON (1 << 15)
+
+#define VR40 0x40
+# define VR40_STALL_ENABLE (1 << 13)
+# define VR40_VERTICAL_INTERP_ENABLE (1 << 12)
+# define VR40_ENHANCED_PANEL_FITTING (1 << 11)
+# define VR40_HORIZONTAL_INTERP_ENABLE (1 << 10)
+# define VR40_AUTO_RATIO_ENABLE (1 << 9)
+# define VR40_CLOCK_GATING_ENABLE (1 << 8)
+
+/*
+ * Panel Fitting Vertical Ratio
+ * (((image_height - 1) << 16) / ((panel_height - 1))) >> 2
+ */
+#define VR41 0x41
+
+/*
+ * Panel Fitting Horizontal Ratio
+ * (((image_width - 1) << 16) / ((panel_width - 1))) >> 2
+ */
+#define VR42 0x42
+
+/*
+ * Horizontal Image Size
+ */
+#define VR43 0x43
+
+/* VR80 GPIO 0
+ */
+#define VR80 0x80
+#define VR81 0x81
+#define VR82 0x82
+#define VR83 0x83
+#define VR84 0x84
+#define VR85 0x85
+#define VR86 0x86
+#define VR87 0x87
+
+/* VR88 GPIO 8
+ */
+#define VR88 0x88
+
+/* Graphics BIOS scratch 0
+ */
+#define VR8E 0x8E
+# define VR8E_PANEL_TYPE_MASK (0xf << 0)
+# define VR8E_PANEL_INTERFACE_CMOS (0 << 4)
+# define VR8E_PANEL_INTERFACE_LVDS (1 << 4)
+# define VR8E_FORCE_DEFAULT_PANEL (1 << 5)
+
+/* Graphics BIOS scratch 1
+ */
+#define VR8F 0x8F
+# define VR8F_VCH_PRESENT (1 << 0)
+# define VR8F_DISPLAY_CONN (1 << 1)
+# define VR8F_POWER_MASK (0x3c)
+# define VR8F_POWER_POS (2)
+
+
+struct ivch_priv {
+ bool quiet;
+
+ uint16_t width, height;
+};
+
+
+static void ivch_dump_regs(struct intel_dvo_device *dvo);
+
+/**
+ * Reads a register on the ivch.
+ *
+ * Each of the 256 registers are 16 bits long.
+ */
+static bool ivch_read(struct intel_dvo_device *dvo, int addr, uint16_t *data)
+{
+ struct ivch_priv *priv = dvo->dev_priv;
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ u8 out_buf[1];
+ u8 in_buf[2];
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = dvo->slave_addr,
+ .flags = I2C_M_RD,
+ .len = 0,
+ },
+ {
+ .addr = 0,
+ .flags = I2C_M_NOSTART,
+ .len = 1,
+ .buf = out_buf,
+ },
+ {
+ .addr = dvo->slave_addr,
+ .flags = I2C_M_RD | I2C_M_NOSTART,
+ .len = 2,
+ .buf = in_buf,
+ }
+ };
+
+ out_buf[0] = addr;
+
+ if (i2c_transfer(adapter, msgs, 3) == 3) {
+ *data = (in_buf[1] << 8) | in_buf[0];
+ return true;
+ }
+
+ if (!priv->quiet) {
+ DRM_DEBUG_KMS("Unable to read register 0x%02x from "
+ "%s:%02x.\n",
+ addr, adapter->name, dvo->slave_addr);
+ }
+ return false;
+}
+
+/** Writes a 16-bit register on the ivch */
+static bool ivch_write(struct intel_dvo_device *dvo, int addr, uint16_t data)
+{
+ struct ivch_priv *priv = dvo->dev_priv;
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ u8 out_buf[3];
+ struct i2c_msg msg = {
+ .addr = dvo->slave_addr,
+ .flags = 0,
+ .len = 3,
+ .buf = out_buf,
+ };
+
+ out_buf[0] = addr;
+ out_buf[1] = data & 0xff;
+ out_buf[2] = data >> 8;
+
+ if (i2c_transfer(adapter, &msg, 1) == 1)
+ return true;
+
+ if (!priv->quiet) {
+ DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
+ addr, adapter->name, dvo->slave_addr);
+ }
+
+ return false;
+}
+
+/** Probes the given bus and slave address for an ivch */
+static bool ivch_init(struct intel_dvo_device *dvo,
+ struct i2c_adapter *adapter)
+{
+ struct ivch_priv *priv;
+ uint16_t temp;
+
+ priv = kzalloc(sizeof(struct ivch_priv), GFP_KERNEL);
+ if (priv == NULL)
+ return false;
+
+ dvo->i2c_bus = adapter;
+ dvo->dev_priv = priv;
+ priv->quiet = true;
+
+ if (!ivch_read(dvo, VR00, &temp))
+ goto out;
+ priv->quiet = false;
+
+ /* Since the identification bits are probably zeroes, which doesn't seem
+ * very unique, check that the value in the base address field matches
+ * the address it's responding on.
+ */
+ if ((temp & VR00_BASE_ADDRESS_MASK) != dvo->slave_addr) {
+ DRM_DEBUG_KMS("ivch detect failed due to address mismatch "
+ "(%d vs %d)\n",
+ (temp & VR00_BASE_ADDRESS_MASK), dvo->slave_addr);
+ goto out;
+ }
+
+ ivch_read(dvo, VR20, &priv->width);
+ ivch_read(dvo, VR21, &priv->height);
+
+ return true;
+
+out:
+ kfree(priv);
+ return false;
+}
+
+static enum drm_connector_status ivch_detect(struct intel_dvo_device *dvo)
+{
+ return connector_status_connected;
+}
+
+static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo,
+ struct drm_display_mode *mode)
+{
+ if (mode->clock > 112000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+/** Sets the power state of the panel connected to the ivch */
+static void ivch_dpms(struct intel_dvo_device *dvo, bool enable)
+{
+ int i;
+ uint16_t vr01, vr30, backlight;
+
+ /* Set the new power state of the panel. */
+ if (!ivch_read(dvo, VR01, &vr01))
+ return;
+
+ if (enable)
+ backlight = 1;
+ else
+ backlight = 0;
+ ivch_write(dvo, VR80, backlight);
+
+ if (enable)
+ vr01 |= VR01_LCD_ENABLE | VR01_DVO_ENABLE;
+ else
+ vr01 &= ~(VR01_LCD_ENABLE | VR01_DVO_ENABLE);
+
+ ivch_write(dvo, VR01, vr01);
+
+ /* Wait for the panel to make its state transition */
+ for (i = 0; i < 100; i++) {
+ if (!ivch_read(dvo, VR30, &vr30))
+ break;
+
+ if (((vr30 & VR30_PANEL_ON) != 0) == enable)
+ break;
+ udelay(1000);
+ }
+ /* wait some more; vch may fail to resync sometimes without this */
+ udelay(16 * 1000);
+}
+
+static bool ivch_get_hw_state(struct intel_dvo_device *dvo)
+{
+ uint16_t vr01;
+
+ /* Set the new power state of the panel. */
+ if (!ivch_read(dvo, VR01, &vr01))
+ return false;
+
+ if (vr01 & VR01_LCD_ENABLE)
+ return true;
+ else
+ return false;
+}
+
+static void ivch_mode_set(struct intel_dvo_device *dvo,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ uint16_t vr40 = 0;
+ uint16_t vr01;
+
+ vr01 = 0;
+ vr40 = (VR40_STALL_ENABLE | VR40_VERTICAL_INTERP_ENABLE |
+ VR40_HORIZONTAL_INTERP_ENABLE);
+
+ if (mode->hdisplay != adjusted_mode->hdisplay ||
+ mode->vdisplay != adjusted_mode->vdisplay) {
+ uint16_t x_ratio, y_ratio;
+
+ vr01 |= VR01_PANEL_FIT_ENABLE;
+ vr40 |= VR40_CLOCK_GATING_ENABLE;
+ x_ratio = (((mode->hdisplay - 1) << 16) /
+ (adjusted_mode->hdisplay - 1)) >> 2;
+ y_ratio = (((mode->vdisplay - 1) << 16) /
+ (adjusted_mode->vdisplay - 1)) >> 2;
+ ivch_write(dvo, VR42, x_ratio);
+ ivch_write(dvo, VR41, y_ratio);
+ } else {
+ vr01 &= ~VR01_PANEL_FIT_ENABLE;
+ vr40 &= ~VR40_CLOCK_GATING_ENABLE;
+ }
+ vr40 &= ~VR40_AUTO_RATIO_ENABLE;
+
+ ivch_write(dvo, VR01, vr01);
+ ivch_write(dvo, VR40, vr40);
+
+ ivch_dump_regs(dvo);
+}
+
+static void ivch_dump_regs(struct intel_dvo_device *dvo)
+{
+ uint16_t val;
+
+ ivch_read(dvo, VR00, &val);
+ DRM_DEBUG_KMS("VR00: 0x%04x\n", val);
+ ivch_read(dvo, VR01, &val);
+ DRM_DEBUG_KMS("VR01: 0x%04x\n", val);
+ ivch_read(dvo, VR30, &val);
+ DRM_DEBUG_KMS("VR30: 0x%04x\n", val);
+ ivch_read(dvo, VR40, &val);
+ DRM_DEBUG_KMS("VR40: 0x%04x\n", val);
+
+ /* GPIO registers */
+ ivch_read(dvo, VR80, &val);
+ DRM_DEBUG_KMS("VR80: 0x%04x\n", val);
+ ivch_read(dvo, VR81, &val);
+ DRM_DEBUG_KMS("VR81: 0x%04x\n", val);
+ ivch_read(dvo, VR82, &val);
+ DRM_DEBUG_KMS("VR82: 0x%04x\n", val);
+ ivch_read(dvo, VR83, &val);
+ DRM_DEBUG_KMS("VR83: 0x%04x\n", val);
+ ivch_read(dvo, VR84, &val);
+ DRM_DEBUG_KMS("VR84: 0x%04x\n", val);
+ ivch_read(dvo, VR85, &val);
+ DRM_DEBUG_KMS("VR85: 0x%04x\n", val);
+ ivch_read(dvo, VR86, &val);
+ DRM_DEBUG_KMS("VR86: 0x%04x\n", val);
+ ivch_read(dvo, VR87, &val);
+ DRM_DEBUG_KMS("VR87: 0x%04x\n", val);
+ ivch_read(dvo, VR88, &val);
+ DRM_DEBUG_KMS("VR88: 0x%04x\n", val);
+
+ /* Scratch register 0 - AIM Panel type */
+ ivch_read(dvo, VR8E, &val);
+ DRM_DEBUG_KMS("VR8E: 0x%04x\n", val);
+
+ /* Scratch register 1 - Status register */
+ ivch_read(dvo, VR8F, &val);
+ DRM_DEBUG_KMS("VR8F: 0x%04x\n", val);
+}
+
+static void ivch_destroy(struct intel_dvo_device *dvo)
+{
+ struct ivch_priv *priv = dvo->dev_priv;
+
+ if (priv) {
+ kfree(priv);
+ dvo->dev_priv = NULL;
+ }
+}
+
+struct intel_dvo_dev_ops ivch_ops = {
+ .init = ivch_init,
+ .dpms = ivch_dpms,
+ .get_hw_state = ivch_get_hw_state,
+ .mode_valid = ivch_mode_valid,
+ .mode_set = ivch_mode_set,
+ .detect = ivch_detect,
+ .dump_regs = ivch_dump_regs,
+ .destroy = ivch_destroy,
+};
Code Review / kvmfornfv.git / blobdiff