[PATCH v3 10/32] drm/via: Add via_dac.c
Kevin Brace
kevinbrace at gmx.com
Mon Jul 25 23:51:05 UTC 2022
From: Kevin Brace <kevinbrace at bracecomputerlab.com>
Signed-off-by: Kevin Brace <kevinbrace at bracecomputerlab.com>
---
drivers/gpu/drm/via/via_dac.c | 504 ++++++++++++++++++++++++++++++++++
1 file changed, 504 insertions(+)
create mode 100644 drivers/gpu/drm/via/via_dac.c
diff --git a/drivers/gpu/drm/via/via_dac.c b/drivers/gpu/drm/via/via_dac.c
new file mode 100644
index 000000000000..0e133c6f6551
--- /dev/null
+++ b/drivers/gpu/drm/via/via_dac.c
@@ -0,0 +1,504 @@
+/*
+ * Copyright © 2016-2018 Kevin Brace.
+ * Copyright 2012 James Simmons. All Rights Reserved.
+ *
+ * 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.
+ *
+ * Author(s):
+ * Kevin Brace <kevinbrace at bracecomputerlab.com>
+ * James Simmons <jsimmons at infradead.org>
+ */
+
+#include <linux/pci.h>
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "via_crtc_hw.h"
+#include "via_drv.h"
+
+
+/*
+ * Enables or disables DAC (VGA) output.
+ */
+static void via_dac_power(struct via_drm_priv *dev_priv, bool outputState)
+{
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+
+ via_dac_set_power(VGABASE, outputState);
+ DRM_INFO("DAC (VGA) Power: %s\n",
+ outputState ? "On" : "Off");
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+/*
+ * Set DAC (VGA) sync polarity.
+ */
+static void via_dac_sync_polarity(struct via_drm_priv *dev_priv,
+ unsigned int flags)
+{
+ u8 syncPolarity = 0x00;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ if (flags & DRM_MODE_FLAG_NHSYNC) {
+ syncPolarity |= BIT(0);
+ }
+
+ if (flags & DRM_MODE_FLAG_NVSYNC) {
+ syncPolarity |= BIT(1);
+ }
+
+ via_dac_set_sync_polarity(VGABASE, syncPolarity);
+ DRM_INFO("DAC (VGA) Horizontal Sync Polarity: %s\n",
+ (syncPolarity & BIT(0)) ? "-" : "+");
+ DRM_INFO("DAC (VGA) Vertical Sync Polarity: %s\n",
+ (syncPolarity & BIT(1)) ? "-" : "+");
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+/*
+ * Sets DAC (VGA) display source.
+ */
+static void via_dac_display_source(struct via_drm_priv *dev_priv,
+ int index)
+{
+ u8 displaySource = index;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ via_dac_set_display_source(VGABASE, displaySource & 0x01);
+ DRM_INFO("DAC (VGA) Display Source: IGA%d\n",
+ (displaySource & 0x01) + 1);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+/*
+ * Routines for controlling stuff on the DAC port
+ */
+static const struct drm_encoder_funcs via_dac_enc_funcs = {
+ .destroy = via_encoder_cleanup,
+};
+
+/*
+ * Manage the power state of DAC (VGA).
+ */
+static void via_dac_dpms(struct drm_encoder *encoder, int mode)
+{
+ struct drm_device *dev = encoder->dev;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ switch (mode) {
+ case DRM_MODE_DPMS_ON:
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_ON);
+ via_dac_power(dev_priv, true);
+ break;
+ case DRM_MODE_DPMS_STANDBY:
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_STANDBY);
+ via_dac_power(dev_priv, true);
+ break;
+ case DRM_MODE_DPMS_SUSPEND:
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_SUSPEND);
+ via_dac_power(dev_priv, true);
+ break;
+ case DRM_MODE_DPMS_OFF:
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_OFF);
+ via_dac_power(dev_priv, false);
+ break;
+ default:
+ DRM_ERROR("Bad DPMS mode.");
+ break;
+ }
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+/* Pass our mode to the connectors and the CRTC to give them a chance to
+ * adjust it according to limitations or connector properties, and also
+ * a chance to reject the mode entirely. Useful for things like scaling.
+ */
+static bool via_dac_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ drm_mode_set_crtcinfo(adjusted_mode, 0);
+ return true;
+}
+
+/*
+ * Handle DAC (VGA) mode setting.
+ */
+static void via_dac_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct drm_device *dev = encoder->dev;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+ struct via_crtc *iga = container_of(encoder->crtc, struct via_crtc, base);
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ via_dac_sync_polarity(dev_priv, adjusted_mode->flags);
+ via_dac_display_source(dev_priv, iga->index);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_dac_prepare(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ if (encoder->crtc) {
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_OFF);
+ via_dac_power(dev_priv, false);
+ }
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_dac_commit(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ if (encoder->crtc) {
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_ON);
+ via_dac_power(dev_priv, true);
+ }
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_dac_disable(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ via_dac_set_dpms_control(VGABASE, VIA_DAC_DPMS_OFF);
+ via_dac_power(dev_priv, false);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static const struct drm_encoder_helper_funcs via_dac_enc_helper_funcs = {
+ .dpms = via_dac_dpms,
+ .mode_fixup = via_dac_mode_fixup,
+ .mode_set = via_dac_mode_set,
+ .prepare = via_dac_prepare,
+ .commit = via_dac_commit,
+ .disable = via_dac_disable,
+};
+
+static enum drm_connector_status
+via_dac_detect(struct drm_connector *connector, bool force)
+{
+ struct via_connector *con = container_of(connector,
+ struct via_connector, base);
+ enum drm_connector_status ret = connector_status_disconnected;
+ struct i2c_adapter *i2c_bus;
+ struct edid *edid = NULL;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ if (con->i2c_bus & VIA_I2C_BUS1) {
+ i2c_bus = via_find_ddc_bus(0x26);
+ } else {
+ i2c_bus = NULL;
+ }
+
+ if (i2c_bus) {
+ edid = drm_get_edid(&con->base, i2c_bus);
+ if (edid) {
+ if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) {
+ ret = connector_status_connected;
+ }
+
+ kfree(edid);
+ goto exit;
+ }
+ }
+
+ if (con->i2c_bus & VIA_I2C_BUS2) {
+ i2c_bus = via_find_ddc_bus(0x31);
+ } else {
+ i2c_bus = NULL;
+ }
+
+ if (i2c_bus) {
+ edid = drm_get_edid(&con->base, i2c_bus);
+ if (edid) {
+ if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) {
+ ret = connector_status_connected;
+ }
+
+ kfree(edid);
+ goto exit;
+ }
+ }
+
+exit:
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return ret;
+}
+
+static const struct drm_connector_funcs via_dac_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .detect = via_dac_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = via_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state =
+ drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state =
+ drm_atomic_helper_connector_destroy_state,
+};
+
+static enum drm_mode_status via_dac_mode_valid(
+ struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct drm_device *dev = connector->dev;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ int min_clock, max_clock;
+ enum drm_mode_status status = MODE_OK;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ min_clock = 25000;
+ switch (pdev->device) {
+ /* CLE266 Chipset */
+ case PCI_DEVICE_ID_VIA_CLE266_GFX:
+ /* KM400(A) / KN400(A) / P4M800 Chipset */
+ case PCI_DEVICE_ID_VIA_KM400_GFX:
+ max_clock = 250000;
+ break;
+ /* K8M800(A) / K8N800(A) Chipset */
+ case PCI_DEVICE_ID_VIA_K8M800_GFX:
+ /* P4M800 Pro / P4M800CE / VN800 / CN700 / CN333 / CN400 Chipset */
+ case PCI_DEVICE_ID_VIA_P4M800_PRO_GFX:
+ max_clock = 300000;
+ break;
+ /* PM800 / PN800 / PM880 / PN880 Chipset */
+ case PCI_DEVICE_ID_VIA_PM800_GFX:
+ /* P4M890 / P4N890 Chipset */
+ case PCI_DEVICE_ID_VIA_P4M890_GFX:
+ /* K8M890 / K8N890 Chipset */
+ case PCI_DEVICE_ID_VIA_CHROME9:
+ /* P4M900 / VN896 / CN896 Chipset */
+ case PCI_DEVICE_ID_VIA_CHROME9_HC:
+ /* CX700(M/M2) / VX700(M/M2) Chipset */
+ case PCI_DEVICE_ID_VIA_UNICHROME_PRO_II:
+ /* VX800 / VX820 Chipset */
+ case PCI_DEVICE_ID_VIA_CHROME9_HC3:
+ /* VX855 / VX875 Chipset */
+ case PCI_DEVICE_ID_VIA_CHROME9_HCM:
+ /* VX900(H) Chipset */
+ case PCI_DEVICE_ID_VIA_CHROME9_HD:
+ max_clock = 350000;
+ break;
+ /* Illegal condition (should never get here) */
+ default:
+ max_clock = 0;
+ break;
+ }
+
+ if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
+ status = MODE_NO_DBLESCAN;
+ goto exit;
+ }
+
+ if (mode->clock < min_clock) {
+ status = MODE_CLOCK_LOW;
+ goto exit;
+ }
+
+ if (mode->clock > max_clock) {
+ status = MODE_CLOCK_HIGH;
+ goto exit;
+ }
+
+exit:
+ DRM_DEBUG_KMS("status: %u\n", status);
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return status;
+}
+
+static int via_dac_get_modes(struct drm_connector *connector)
+{
+ struct via_connector *con = container_of(connector,
+ struct via_connector, base);
+ int count = 0;
+ struct i2c_adapter *i2c_bus;
+ struct edid *edid = NULL;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ if (con->i2c_bus & VIA_I2C_BUS1) {
+ i2c_bus = via_find_ddc_bus(0x26);
+ } else {
+ i2c_bus = NULL;
+ }
+
+ if (i2c_bus) {
+ edid = drm_get_edid(&con->base, i2c_bus);
+ if (edid) {
+ if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) {
+ drm_connector_update_edid_property(connector,
+ edid);
+ count = drm_add_edid_modes(connector, edid);
+ }
+
+ kfree(edid);
+ goto exit;
+ }
+ }
+
+ if (con->i2c_bus & VIA_I2C_BUS2) {
+ i2c_bus = via_find_ddc_bus(0x31);
+ } else {
+ i2c_bus = NULL;
+ }
+
+ if (i2c_bus) {
+ edid = drm_get_edid(&con->base, i2c_bus);
+ if (edid) {
+ if (!(edid->input & DRM_EDID_INPUT_DIGITAL)) {
+ drm_connector_update_edid_property(connector,
+ edid);
+ count = drm_add_edid_modes(connector, edid);
+ }
+
+ kfree(edid);
+ goto exit;
+ }
+ }
+
+exit:
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return count;
+}
+
+static const struct drm_connector_helper_funcs
+via_dac_connector_helper_funcs = {
+ .mode_valid = via_dac_mode_valid,
+ .get_modes = via_dac_get_modes,
+};
+
+void via_dac_probe(struct drm_device *dev)
+{
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ u16 chipset = pdev->device;
+ u8 sr13, sr5a;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ switch (chipset) {
+ case PCI_DEVICE_ID_VIA_UNICHROME_PRO_II:
+ case PCI_DEVICE_ID_VIA_CHROME9_HC3:
+ case PCI_DEVICE_ID_VIA_CHROME9_HCM:
+ case PCI_DEVICE_ID_VIA_CHROME9_HD:
+ sr5a = vga_rseq(VGABASE, 0x5a);
+ DRM_DEBUG_KMS("SR5A: 0x%02x\n", sr5a);
+
+ /* Setting SR5A[0] to 1.
+ * This allows the reading out the alternative
+ * pin strapping information from SR12 and SR13. */
+ svga_wseq_mask(VGABASE, 0x5a, BIT(0), BIT(0));
+ DRM_DEBUG_KMS("SR5A: 0x%02x\n", sr5a);
+
+ sr13 = vga_rseq(VGABASE, 0x13);
+ DRM_DEBUG_KMS("SR13: 0x%02x\n", sr13);
+
+ if (!(sr13 & BIT(2))) {
+ dev_priv->dac_presence = true;
+ DRM_DEBUG_KMS("Detected the presence of VGA.\n");
+ } else {
+ dev_priv->dac_presence = false;
+ }
+
+ /* Restore SR5A. */
+ vga_wseq(VGABASE, 0x5a, sr5a);
+ break;
+ default:
+ dev_priv->dac_presence = true;
+ DRM_DEBUG_KMS("Detected the presence of VGA.\n");
+ break;
+ }
+
+ dev_priv->dac_i2c_bus = VIA_I2C_NONE;
+
+ if (dev_priv->dac_presence) {
+ dev_priv->dac_i2c_bus = VIA_I2C_BUS2 | VIA_I2C_BUS1;
+ }
+
+ dev_priv->mapped_i2c_bus |= dev_priv->dac_i2c_bus;
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+void via_dac_init(struct drm_device *dev)
+{
+ struct via_connector *con;
+ struct via_encoder *enc;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+ enc = kzalloc(sizeof(*enc) + sizeof(*con), GFP_KERNEL);
+ if (!enc) {
+ DRM_ERROR("Failed to allocate connector and encoder\n");
+ return;
+ }
+ con = &enc->cons[0];
+ INIT_LIST_HEAD(&con->props);
+
+ /* Piece together our connector */
+ drm_connector_init(dev, &con->base, &via_dac_connector_funcs,
+ DRM_MODE_CONNECTOR_VGA);
+ drm_connector_helper_add(&con->base, &via_dac_connector_helper_funcs);
+ drm_connector_register(&con->base);
+
+ con->i2c_bus = dev_priv->dac_i2c_bus;
+ con->base.doublescan_allowed = false;
+ con->base.interlace_allowed = true;
+
+ /* Setup the encoders and attach them */
+ drm_encoder_init(dev, &enc->base, &via_dac_enc_funcs,
+ DRM_MODE_ENCODER_DAC, NULL);
+ drm_encoder_helper_add(&enc->base, &via_dac_enc_helper_funcs);
+
+ enc->base.possible_crtcs = BIT(1) | BIT(0);
+ enc->base.possible_clones = 0;
+ enc->di_port = VIA_DI_PORT_NONE;
+
+ drm_connector_attach_encoder(&con->base, &enc->base);
+}
--
2.35.1
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