commit 9549976c231b676c2c8e70fd6979115c1c8ed747 Author: James Simmons jsimmons@infradead.org Date: Sat Jun 8 12:02:59 2013 -0400
via: VGA analog support
Implement the encoder and connector for VGA analog displays.
Signed-Off-by: James Simmons jsimmons@infradead.org
diff --git a/drivers/gpu/drm/via/via_analog.c b/drivers/gpu/drm/via/via_analog.c new file mode 100644 index 0000000..8fabeac --- /dev/null +++ b/drivers/gpu/drm/via/via_analog.c @@ -0,0 +1,146 @@ +/* + * Copyright © 2012 James Simmons + * + * 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: + * James Simmons jsimmons@infradead.org + */ +#include "via_drv.h" + +/* + * Routines for controlling stuff on the analog port + */ +static const struct drm_encoder_funcs via_dac_enc_funcs = { + .destroy = via_encoder_cleanup, +}; + +/* Manage the power state of the DAC */ +static void +via_dac_dpms(struct drm_encoder *encoder, int mode) +{ + struct drm_via_private *dev_priv = encoder->dev->dev_private; + u8 mask = 0; + + switch (mode) { + case DRM_MODE_DPMS_SUSPEND: + mask = BIT(5); // VSync off + break; + case DRM_MODE_DPMS_STANDBY: + mask = BIT(4); // HSync off + break; + case DRM_MODE_DPMS_OFF: + mask = (BIT(5) | BIT(4));// HSync and VSync off + break; + case DRM_MODE_DPMS_ON: + default: + break; + } + svga_wcrt_mask(VGABASE, 0x36, mask, BIT(5) | BIT(4)); +} + +/* 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. Usefule 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; +} + +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_set_sync_polarity, + .prepare = via_encoder_prepare, + .commit = via_encoder_commit, + .disable = via_encoder_disable, +}; + +static enum drm_connector_status +via_analog_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 edid *edid = NULL; + + drm_mode_connector_update_edid_property(connector, edid); + if (con->ddc_bus) { + edid = drm_get_edid(connector, con->ddc_bus); + if (edid) { + drm_mode_connector_update_edid_property(connector, edid); + kfree(edid); + ret = connector_status_connected; + } + } + return ret; +} + +static const struct drm_connector_funcs via_analog_connector_funcs = { + .dpms = drm_helper_connector_dpms, + .detect = via_analog_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .set_property = via_connector_set_property, + .destroy = via_connector_destroy, +}; + +static const struct drm_connector_helper_funcs via_analog_connector_helper_funcs = { + .mode_valid = via_connector_mode_valid, + .get_modes = via_get_edid_modes, + .best_encoder = via_best_encoder, +}; + +void +via_analog_init(struct drm_device *dev) +{ + struct via_connector *con; + struct via_encoder *enc; + + enc = kzalloc(sizeof(*enc) + sizeof(*con), GFP_KERNEL); + if (!enc) { + DRM_ERROR("Failed to allocate connector and encoder\n"); + return; + } + con = &enc->cons[0]; + + /* Piece together our connector */ + drm_connector_init(dev, &con->base, &via_analog_connector_funcs, + DRM_MODE_CONNECTOR_VGA); + drm_connector_helper_add(&con->base, &via_analog_connector_helper_funcs); + drm_sysfs_connector_add(&con->base); + + con->ddc_bus = via_find_ddc_bus(0x26); + 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); + 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->diPort = DISP_DI_DAC; + + drm_mode_connector_attach_encoder(&con->base, &enc->base); +}