diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dp.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_dp.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c new file mode 100644 index 0000000..36fd225 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c @@ -0,0 +1,96 @@ +/* + * Copyright 2009 Red Hat Inc. + * + * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Ben Skeggs + */ + +#include <drm/drmP.h> +#include <drm/drm_dp_helper.h> + +#include "nouveau_drm.h" +#include "nouveau_connector.h" +#include "nouveau_encoder.h" +#include "nouveau_crtc.h" + +#include <core/class.h> + +#include <subdev/gpio.h> +#include <subdev/i2c.h> + +static void +nouveau_dp_probe_oui(struct drm_device *dev, struct nouveau_i2c_port *auxch, + u8 *dpcd) +{ + struct nouveau_drm *drm = nouveau_drm(dev); + u8 buf[3]; + + if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) + return; + + if (!nv_rdaux(auxch, DP_SINK_OUI, buf, 3)) + NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); + + if (!nv_rdaux(auxch, DP_BRANCH_OUI, buf, 3)) + NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); + +} + +bool +nouveau_dp_detect(struct drm_encoder *encoder) +{ + struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); + struct drm_device *dev = encoder->dev; + struct nouveau_drm *drm = nouveau_drm(dev); + struct nouveau_i2c_port *auxch; + u8 *dpcd = nv_encoder->dp.dpcd; + int ret; + + auxch = nv_encoder->i2c; + if (!auxch) + return false; + + ret = nv_rdaux(auxch, DP_DPCD_REV, dpcd, 8); + if (ret) + return false; + + nv_encoder->dp.link_bw = 27000 * dpcd[1]; + nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK; + + NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n", + nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]); + NV_DEBUG(drm, "encoder: %dx%d\n", + nv_encoder->dcb->dpconf.link_nr, + nv_encoder->dcb->dpconf.link_bw); + + if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr) + nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr; + if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw) + nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw; + + NV_DEBUG(drm, "maximum: %dx%d\n", + nv_encoder->dp.link_nr, nv_encoder->dp.link_bw); + + nouveau_dp_probe_oui(dev, auxch, dpcd); + + return true; +} |