drm/i915: Add support for VGA load detection (pre-945).
Two approaches for VGA detections: hot plug detection for 945G onwards and load pipe detection for Pre-945G. Load pipe detection will get one free pipe, set border color as red and blue, then check CRT status by swf register. This is a sync-up with the 2D driver. Signed-off-by: Ma Ling <ling.ma@intel.com> Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Ma Ling
Eric Anholt
parent
619ac3b75a
commit
e4a5d54f92
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@ -198,9 +198,142 @@ static bool intel_crt_detect_ddc(struct drm_connector *connector)
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return intel_ddc_probe(intel_output);
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}
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static enum drm_connector_status
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intel_crt_load_detect(struct drm_crtc *crtc, struct intel_output *intel_output)
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{
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struct drm_encoder *encoder = &intel_output->enc;
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struct drm_device *dev = encoder->dev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
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uint32_t pipe = intel_crtc->pipe;
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uint32_t save_bclrpat;
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uint32_t save_vtotal;
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uint32_t vtotal, vactive;
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uint32_t vsample;
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uint32_t vblank, vblank_start, vblank_end;
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uint32_t dsl;
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uint32_t bclrpat_reg;
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uint32_t vtotal_reg;
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uint32_t vblank_reg;
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uint32_t vsync_reg;
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uint32_t pipeconf_reg;
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uint32_t pipe_dsl_reg;
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uint8_t st00;
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enum drm_connector_status status;
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if (pipe == 0) {
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bclrpat_reg = BCLRPAT_A;
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vtotal_reg = VTOTAL_A;
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vblank_reg = VBLANK_A;
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vsync_reg = VSYNC_A;
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pipeconf_reg = PIPEACONF;
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pipe_dsl_reg = PIPEADSL;
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} else {
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bclrpat_reg = BCLRPAT_B;
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vtotal_reg = VTOTAL_B;
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vblank_reg = VBLANK_B;
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vsync_reg = VSYNC_B;
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pipeconf_reg = PIPEBCONF;
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pipe_dsl_reg = PIPEBDSL;
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}
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save_bclrpat = I915_READ(bclrpat_reg);
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save_vtotal = I915_READ(vtotal_reg);
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vblank = I915_READ(vblank_reg);
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vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
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vactive = (save_vtotal & 0x7ff) + 1;
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vblank_start = (vblank & 0xfff) + 1;
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vblank_end = ((vblank >> 16) & 0xfff) + 1;
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/* Set the border color to purple. */
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I915_WRITE(bclrpat_reg, 0x500050);
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if (IS_I9XX(dev)) {
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uint32_t pipeconf = I915_READ(pipeconf_reg);
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I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
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/* Wait for next Vblank to substitue
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* border color for Color info */
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intel_wait_for_vblank(dev);
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st00 = I915_READ8(VGA_MSR_WRITE);
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status = ((st00 & (1 << 4)) != 0) ?
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connector_status_connected :
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connector_status_disconnected;
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I915_WRITE(pipeconf_reg, pipeconf);
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} else {
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bool restore_vblank = false;
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int count, detect;
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/*
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* If there isn't any border, add some.
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* Yes, this will flicker
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*/
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if (vblank_start <= vactive && vblank_end >= vtotal) {
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uint32_t vsync = I915_READ(vsync_reg);
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uint32_t vsync_start = (vsync & 0xffff) + 1;
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vblank_start = vsync_start;
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I915_WRITE(vblank_reg,
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(vblank_start - 1) |
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((vblank_end - 1) << 16));
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restore_vblank = true;
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}
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/* sample in the vertical border, selecting the larger one */
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if (vblank_start - vactive >= vtotal - vblank_end)
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vsample = (vblank_start + vactive) >> 1;
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else
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vsample = (vtotal + vblank_end) >> 1;
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/*
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* Wait for the border to be displayed
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*/
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while (I915_READ(pipe_dsl_reg) >= vactive)
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;
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while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
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;
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/*
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* Watch ST00 for an entire scanline
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*/
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detect = 0;
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count = 0;
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do {
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count++;
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/* Read the ST00 VGA status register */
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st00 = I915_READ8(VGA_MSR_WRITE);
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if (st00 & (1 << 4))
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detect++;
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} while ((I915_READ(pipe_dsl_reg) == dsl));
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/* restore vblank if necessary */
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if (restore_vblank)
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I915_WRITE(vblank_reg, vblank);
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/*
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* If more than 3/4 of the scanline detected a monitor,
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* then it is assumed to be present. This works even on i830,
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* where there isn't any way to force the border color across
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* the screen
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*/
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status = detect * 4 > count * 3 ?
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connector_status_connected :
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connector_status_disconnected;
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}
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/* Restore previous settings */
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I915_WRITE(bclrpat_reg, save_bclrpat);
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return status;
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}
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static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
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{
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struct drm_device *dev = connector->dev;
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struct intel_output *intel_output = to_intel_output(connector);
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struct drm_encoder *encoder = &intel_output->enc;
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struct drm_crtc *crtc;
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int dpms_mode;
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enum drm_connector_status status;
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if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
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if (intel_crt_detect_hotplug(connector))
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@ -212,8 +345,20 @@ static enum drm_connector_status intel_crt_detect(struct drm_connector *connecto
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if (intel_crt_detect_ddc(connector))
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return connector_status_connected;
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/* TODO use load detect */
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return connector_status_unknown;
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/* for pre-945g platforms use load detect */
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if (encoder->crtc && encoder->crtc->enabled) {
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status = intel_crt_load_detect(encoder->crtc, intel_output);
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} else {
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crtc = intel_get_load_detect_pipe(intel_output,
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NULL, &dpms_mode);
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if (crtc) {
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status = intel_crt_load_detect(crtc, intel_output);
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intel_release_load_detect_pipe(intel_output, dpms_mode);
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} else
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status = connector_status_unknown;
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}
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return status;
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}
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static void intel_crt_destroy(struct drm_connector *connector)
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