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drm/i915: hw state readout support for fdi m/n

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We want to use the fdi m/n values to easily compute the adjusted mode
dotclock on pch ports. Hence make sure the values stored in the pipe
config are always reliable.

v2: Fixup FDI TU readout.

v3: Rebase on top of moved cpu_transcoder.

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-04-04 13:28:53 +02:00
parent 08a24034a8
commit 72419203ca
2 changed files with 26 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View file

@ -2776,6 +2776,7 @@
/* Transfer unit size for display port - 1, default is 0x3f (for TU size 64) */
#define PIPE_GMCH_DATA_M_TU_SIZE_MASK (0x3f << 25)
#define PIPE_GMCH_DATA_M_TU_SIZE_SHIFT 25
#define TU_SIZE_SHIFT 25
#define PIPE_GMCH_DATA_M_MASK (0xffffff)

25
drivers/gpu/drm/i915/intel_display.c
View file

@ -5817,6 +5817,22 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
return ret;
}
static void ironlake_get_fdi_m_n_config(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config)
{
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum transcoder transcoder = pipe_config->cpu_transcoder;
pipe_config->fdi_m_n.link_m = I915_READ(PIPE_LINK_M1(transcoder));
pipe_config->fdi_m_n.link_n = I915_READ(PIPE_LINK_N1(transcoder));
pipe_config->fdi_m_n.gmch_m = I915_READ(PIPE_DATA_M1(transcoder))
& ~TU_SIZE_MASK;
pipe_config->fdi_m_n.gmch_n = I915_READ(PIPE_DATA_N1(transcoder));
pipe_config->fdi_m_n.tu = ((I915_READ(PIPE_DATA_M1(transcoder))
& TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
}
static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config)
{
@ -5834,6 +5850,8 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
tmp = I915_READ(FDI_RX_CTL(crtc->pipe));
pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
FDI_DP_PORT_WIDTH_SHIFT) + 1;
ironlake_get_fdi_m_n_config(crtc, pipe_config);
}
return true;
@ -5979,6 +5997,8 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
tmp = I915_READ(FDI_RX_CTL(PIPE_A));
pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
FDI_DP_PORT_WIDTH_SHIFT) + 1;
ironlake_get_fdi_m_n_config(crtc, pipe_config);
}
return true;
@ -7960,6 +7980,11 @@ intel_pipe_config_compare(struct intel_crtc_config *current_config,
PIPE_CONF_CHECK_I(has_pch_encoder);
PIPE_CONF_CHECK_I(fdi_lanes);
PIPE_CONF_CHECK_I(fdi_m_n.gmch_m);
PIPE_CONF_CHECK_I(fdi_m_n.gmch_n);
PIPE_CONF_CHECK_I(fdi_m_n.link_m);
PIPE_CONF_CHECK_I(fdi_m_n.link_n);
PIPE_CONF_CHECK_I(fdi_m_n.tu);
#undef PIPE_CONF_CHECK_I