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drm/i915: Read DP branch device SW revision

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SW revision is mandatory field for DisplayPort branch
devices. This is defined in DPCD register fields 0x50A
and 0x50B.

v2: move drm_dp_ds_revision structure to be part of
    drm_dp_link structure (Daniel)
v3: remove dependency to drm_dp_helper but instead parse
    DPCD and print SW revision info to dmesg (Ville)
v4: commit message fix (Jim Bride)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-9-git-send-email-mika.kahola@intel.com
This commit is contained in:
Mika Kahola 2016-09-09 14:10:54 +03:00 committed by Jani Nikula
parent 0e390a33a6
commit 1a2724fa94
2 changed files with 21 additions and 0 deletions
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20
drivers/gpu/drm/i915/intel_dp.c
View file

@ -1438,6 +1438,25 @@ static void intel_dp_print_hw_revision(struct intel_dp *intel_dp)
DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf);
}
static void intel_dp_print_sw_revision(struct intel_dp *intel_dp)
{
uint8_t rev[2];
int len;
if ((drm_debug & DRM_UT_KMS) == 0)
return;
if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
DP_DWN_STRM_PORT_PRESENT))
return;
len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_SW_REV, &rev, 2);
if (len < 0)
return;
DRM_DEBUG_KMS("sink sw revision: %d.%d\n", rev[0], rev[1]);
}
static int rate_to_index(int find, const int *rates)
{
int i = 0;
@ -4332,6 +4351,7 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
intel_dp_probe_oui(intel_dp);
intel_dp_print_hw_revision(intel_dp);
intel_dp_print_sw_revision(intel_dp);
intel_dp_configure_mst(intel_dp);

1
include/drm/drm_dp_helper.h
View file

@ -447,6 +447,7 @@
#define DP_BRANCH_OUI 0x500
#define DP_BRANCH_ID 0x503
#define DP_BRANCH_HW_REV 0x509
#define DP_BRANCH_SW_REV 0x50A
#define DP_SET_POWER 0x600
# define DP_SET_POWER_D0 0x1