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drm/i915: reject modes the LPT FDI receiver can't handle

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More specifically, the LPT FDI RX only supports 8bpc and a maximum of
2 lanes, so anything above that won't work and should be rejected.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2012-11-29 11:29:32 -02:00 committed by Daniel Vetter
parent 248138b598
commit d4b1931c14
3 changed files with 20 additions and 9 deletions
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5
drivers/gpu/drm/i915/intel_crt.c
View File

@ -198,6 +198,11 @@ static int intel_crt_mode_valid(struct drm_connector *connector,
if (mode->clock > max_clock)
return MODE_CLOCK_HIGH;
/* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
if (HAS_PCH_LPT(dev) &&
(ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
return MODE_CLOCK_HIGH;
return MODE_OK;
}

23
drivers/gpu/drm/i915/intel_display.c
View File

@ -5228,6 +5228,17 @@ static bool ironlake_check_fdi_lanes(struct intel_crtc *intel_crtc)
}
}
int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp)
{
/*
* Account for spread spectrum to avoid
* oversubscribing the link. Max center spread
* is 2.5%; use 5% for safety's sake.
*/
u32 bps = target_clock * bpp * 21 / 20;
return bps / (link_bw * 8) + 1;
}
static void ironlake_set_m_n(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
@ -5281,15 +5292,9 @@ static void ironlake_set_m_n(struct drm_crtc *crtc,
else
target_clock = adjusted_mode->clock;
if (!lane) {
/*
* Account for spread spectrum to avoid
* oversubscribing the link. Max center spread
* is 2.5%; use 5% for safety's sake.
*/
u32 bps = target_clock * intel_crtc->bpp * 21 / 20;
lane = bps / (link_bw * 8) + 1;
}
if (!lane)
lane = ironlake_get_lanes_required(target_clock, link_bw,
intel_crtc->bpp);
intel_crtc->fdi_lanes = lane;

1
drivers/gpu/drm/i915/intel_drv.h
View File

@ -559,6 +559,7 @@ intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
enum pipe pipe);
extern void intel_wait_for_vblank(struct drm_device *dev, int pipe);
extern void intel_wait_for_pipe_off(struct drm_device *dev, int pipe);
extern int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp);
struct intel_load_detect_pipe {
struct drm_framebuffer *release_fb;