diff options
Diffstat (limited to 'drivers/gpu/drm/msm/hdmi/hdmi_bridge.c')
| -rw-r--r-- | drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c new file mode 100644 index 000000000000..5a8ee3473cf5 --- /dev/null +++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c @@ -0,0 +1,167 @@ +/* + * Copyright (C) 2013 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "hdmi.h" + +struct hdmi_bridge { + struct drm_bridge base; + + struct hdmi *hdmi; + + unsigned long int pixclock; +}; +#define to_hdmi_bridge(x) container_of(x, struct hdmi_bridge, base) + +static void hdmi_bridge_destroy(struct drm_bridge *bridge) +{ + struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge); + hdmi_unreference(hdmi_bridge->hdmi); + drm_bridge_cleanup(bridge); + kfree(hdmi_bridge); +} + +static void hdmi_bridge_pre_enable(struct drm_bridge *bridge) +{ + struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge); + struct hdmi *hdmi = hdmi_bridge->hdmi; + struct hdmi_phy *phy = hdmi->phy; + + DBG("power up"); + phy->funcs->powerup(phy, hdmi_bridge->pixclock); + hdmi_set_mode(hdmi, true); +} + +static void hdmi_bridge_enable(struct drm_bridge *bridge) +{ +} + +static void hdmi_bridge_disable(struct drm_bridge *bridge) +{ +} + +static void hdmi_bridge_post_disable(struct drm_bridge *bridge) +{ + struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge); + struct hdmi *hdmi = hdmi_bridge->hdmi; + struct hdmi_phy *phy = hdmi->phy; + + DBG("power down"); + hdmi_set_mode(hdmi, false); + phy->funcs->powerdown(phy); +} + +static void hdmi_bridge_mode_set(struct drm_bridge *bridge, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge); + struct hdmi *hdmi = hdmi_bridge->hdmi; + int hstart, hend, vstart, vend; + uint32_t frame_ctrl; + + mode = adjusted_mode; + + hdmi_bridge->pixclock = mode->clock * 1000; + + hdmi->hdmi_mode = drm_match_cea_mode(mode) > 1; + + hstart = mode->htotal - mode->hsync_start; + hend = mode->htotal - mode->hsync_start + mode->hdisplay; + + vstart = mode->vtotal - mode->vsync_start - 1; + vend = mode->vtotal - mode->vsync_start + mode->vdisplay - 1; + + DBG("htotal=%d, vtotal=%d, hstart=%d, hend=%d, vstart=%d, vend=%d", + mode->htotal, mode->vtotal, hstart, hend, vstart, vend); + + hdmi_write(hdmi, REG_HDMI_TOTAL, + HDMI_TOTAL_H_TOTAL(mode->htotal - 1) | + HDMI_TOTAL_V_TOTAL(mode->vtotal - 1)); + + hdmi_write(hdmi, REG_HDMI_ACTIVE_HSYNC, + HDMI_ACTIVE_HSYNC_START(hstart) | + HDMI_ACTIVE_HSYNC_END(hend)); + hdmi_write(hdmi, REG_HDMI_ACTIVE_VSYNC, + HDMI_ACTIVE_VSYNC_START(vstart) | + HDMI_ACTIVE_VSYNC_END(vend)); + + if (mode->flags & DRM_MODE_FLAG_INTERLACE) { + hdmi_write(hdmi, REG_HDMI_VSYNC_TOTAL_F2, + HDMI_VSYNC_TOTAL_F2_V_TOTAL(mode->vtotal)); + hdmi_write(hdmi, REG_HDMI_VSYNC_ACTIVE_F2, + HDMI_VSYNC_ACTIVE_F2_START(vstart + 1) | + HDMI_VSYNC_ACTIVE_F2_END(vend + 1)); + } else { + hdmi_write(hdmi, REG_HDMI_VSYNC_TOTAL_F2, + HDMI_VSYNC_TOTAL_F2_V_TOTAL(0)); + hdmi_write(hdmi, REG_HDMI_VSYNC_ACTIVE_F2, + HDMI_VSYNC_ACTIVE_F2_START(0) | + HDMI_VSYNC_ACTIVE_F2_END(0)); + } + + frame_ctrl = 0; + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + frame_ctrl |= HDMI_FRAME_CTRL_HSYNC_LOW; + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + frame_ctrl |= HDMI_FRAME_CTRL_VSYNC_LOW; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + frame_ctrl |= HDMI_FRAME_CTRL_INTERLACED_EN; + DBG("frame_ctrl=%08x", frame_ctrl); + hdmi_write(hdmi, REG_HDMI_FRAME_CTRL, frame_ctrl); + + // TODO until we have audio, this might be safest: + if (hdmi->hdmi_mode) + hdmi_write(hdmi, REG_HDMI_GC, HDMI_GC_MUTE); +} + +static const struct drm_bridge_funcs hdmi_bridge_funcs = { + .pre_enable = hdmi_bridge_pre_enable, + .enable = hdmi_bridge_enable, + .disable = hdmi_bridge_disable, + .post_disable = hdmi_bridge_post_disable, + .mode_set = hdmi_bridge_mode_set, + .destroy = hdmi_bridge_destroy, +}; + + +/* initialize bridge */ +struct drm_bridge *hdmi_bridge_init(struct hdmi *hdmi) +{ + struct drm_bridge *bridge = NULL; + struct hdmi_bridge *hdmi_bridge; + int ret; + + hdmi_bridge = kzalloc(sizeof(*hdmi_bridge), GFP_KERNEL); + if (!hdmi_bridge) { + ret = -ENOMEM; + goto fail; + } + + hdmi_bridge->hdmi = hdmi_reference(hdmi); + + bridge = &hdmi_bridge->base; + + drm_bridge_init(hdmi->dev, bridge, &hdmi_bridge_funcs); + + return bridge; + +fail: + if (bridge) + hdmi_bridge_destroy(bridge); + + return ERR_PTR(ret); +} |