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drm/i915/lspcon: Fail LSPCON probe if the start of DPCD can't be read

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All types of DP devices (eDP, DP sink, DP branch) will fail their probe
if the start of DPCD can't be read. The LSPCON PCON functionality also
depends on accessing this area, so fail the probe if the read fails.

Cc: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477326811-30431-6-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-10-24 19:33:28 +03:00
parent 7b3fc170d6
commit 24e807e79f
3 changed files with 8 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpu/drm/i915/intel_dp.c
View file

@ -3497,7 +3497,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
intel_dp->DP = DP;
}
static bool
bool
intel_dp_read_dpcd(struct intel_dp *intel_dp)
{
if (drm_dp_dpcd_read(&intel_dp->aux, 0x000, intel_dp->dpcd,

2
drivers/gpu/drm/i915/intel_drv.h
View file

@ -1467,6 +1467,8 @@ static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
return ~((1 << lane_count) - 1) & 0xf;
}
bool intel_dp_read_dpcd(struct intel_dp *intel_dp);
/* intel_dp_aux_backlight.c */
int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector);

5
drivers/gpu/drm/i915/intel_lspcon.c
View file

@ -131,6 +131,11 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
}
}
if (!intel_dp_read_dpcd(dp)) {
DRM_ERROR("LSPCON DPCD read failed\n");
return false;
}
DRM_DEBUG_KMS("Success: LSPCON init\n");
return true;
}