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drm/i915/dp: Fetch downstream port info if needed during DPCD fetch 

v2: Fix parenthesis mismatch, spotted by Jani Nikula

Tested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Fixup merge conflict and MAX_DOWNSTREAM #define as spotted by
Jani.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Adam Jackson 2012-09-18 10:58:49 -04:00 committed by Daniel Vetter
parent e89861dfa3
commit b091cd928d
2 changed files with 21 additions and 5 deletions
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24
drivers/gpu/drm/i915/intel_dp.c
View File

@ -37,6 +37,7 @@
#include "i915_drm.h"
#include "i915_drv.h"
#define DP_RECEIVER_CAP_SIZE 0xf
#define DP_LINK_STATUS_SIZE 6
#define DP_LINK_CHECK_TIMEOUT (10 * 1000)
@ -1964,12 +1965,25 @@ static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
{
if (intel_dp_aux_native_read_retry(intel_dp, 0x000, intel_dp->dpcd,
sizeof(intel_dp->dpcd)) &&
(intel_dp->dpcd[DP_DPCD_REV] != 0)) {
return true;
}
sizeof(intel_dp->dpcd)) == 0)
return false; /* aux transfer failed */
return false;
if (intel_dp->dpcd[DP_DPCD_REV] == 0)
return false; /* DPCD not present */
if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
DP_DWN_STRM_PORT_PRESENT))
return true; /* native DP sink */
if (intel_dp->dpcd[DP_DPCD_REV] == 0x10)
return true; /* no per-port downstream info */
if (intel_dp_aux_native_read_retry(intel_dp, DP_DOWNSTREAM_PORT_0,
intel_dp->downstream_ports,
DP_MAX_DOWNSTREAM_PORTS) == 0)
return false; /* downstream port status fetch failed */
return true;
}
static void

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

@ -332,6 +332,7 @@ struct intel_hdmi {
};
#define DP_RECEIVER_CAP_SIZE 0xf
#define DP_MAX_DOWNSTREAM_PORTS 0x10
#define DP_LINK_CONFIGURATION_SIZE 9
struct intel_dp {
@ -346,6 +347,7 @@ struct intel_dp {
uint8_t link_bw;
uint8_t lane_count;
uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
struct i2c_adapter adapter;
struct i2c_algo_dp_aux_data algo;
bool is_pch_edp;