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drm/i915/dp: Log the DPCD only if we have successfully retrieved one

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Moving the DPCD just after a successful read will allow to:
  - log all DPCD reads (eDP ones, changes signalled by HPD IRQ)
  - don't log it if we haven't been able to read it

v2: Be sure to log the DPCD when a downstream port does not have HPD
    support and the branch device asserts HPD (Jani Nikula)

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2012-12-13 16:09:02 +00:00 committed by Daniel Vetter
parent 1b4696394a
commit 577c7a505b
1 changed files with 6 additions and 5 deletions
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11
drivers/gpu/drm/i915/intel_dp.c
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@ -2084,10 +2084,16 @@ intel_dp_link_down(struct intel_dp *intel_dp)
static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
{
char dpcd_hex_dump[sizeof(intel_dp->dpcd) * 3];
if (intel_dp_aux_native_read_retry(intel_dp, 0x000, intel_dp->dpcd,
sizeof(intel_dp->dpcd)) == 0)
return false; /* aux transfer failed */
hex_dump_to_buffer(intel_dp->dpcd, sizeof(intel_dp->dpcd),
32, 1, dpcd_hex_dump, sizeof(dpcd_hex_dump), false);
DRM_DEBUG_KMS("DPCD: %s\n", dpcd_hex_dump);
if (intel_dp->dpcd[DP_DPCD_REV] == 0)
return false; /* DPCD not present */
@ -2353,7 +2359,6 @@ intel_dp_detect(struct drm_connector *connector, bool force)
struct drm_device *dev = connector->dev;
enum drm_connector_status status;
struct edid *edid = NULL;
char dpcd_hex_dump[sizeof(intel_dp->dpcd) * 3];
intel_dp->has_audio = false;
@ -2362,10 +2367,6 @@ intel_dp_detect(struct drm_connector *connector, bool force)
else
status = g4x_dp_detect(intel_dp);
hex_dump_to_buffer(intel_dp->dpcd, sizeof(intel_dp->dpcd),
32, 1, dpcd_hex_dump, sizeof(dpcd_hex_dump), false);
DRM_DEBUG_KMS("DPCD: %s\n", dpcd_hex_dump);
if (status != connector_status_connected)
return status;