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drm/i915: Don't write the HDMI buffer translation entry when not needed 

We don't actually need to write the HDMI entry on DDIs that have no
chance to be used as HDMI ports.

While this patch shouldn't change the current behaviour, it makes
further enabling work easier as we'll have an eDP table filling the full
10 entries.

v2: Rely on the logic from intel_ddi_init() to figure out if the DDI port
    supports HDMI or not (Paulo).

Suggested-by: Satheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2014-08-04 15:04:43 +01:00 committed by Daniel Vetter
parent b403745c84
commit ce3b7e9bcf
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/intel_ddi.c
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@ -191,6 +191,12 @@ enum port intel_ddi_get_encoder_port(struct intel_encoder *intel_encoder)
}
}
static bool
intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port)
{
return intel_dig_port->hdmi.hdmi_reg;
}
/*
* Starting with Haswell, DDI port buffers must be programmed with correct
* values in advance. The buffer values are different for FDI and DP modes,
@ -294,6 +300,9 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev,
reg += 4;
}
if (!intel_dig_port_supports_hdmi(intel_dig_port))
return;
/* Choose a good default if VBT is badly populated */
if (hdmi_level == HDMI_LEVEL_SHIFT_UNKNOWN ||
hdmi_level >= n_hdmi_entries)