| Message ID | 1471430989-28161-8-git-send-email-mika.kahola@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Aug 17, 2016 at 01:49:43PM +0300, Mika Kahola wrote: > HW revision is mandatory field for DisplayPort branch > devices. This is defined in DPCD register field 0x509. > > 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 HW revision info to dmesg (Ville) > > Signed-off-by: Mika Kahola <mika.kahola@intel.com> Reviewed-by: Jim Bride <jim.bride@linux.intel.com> > --- > drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++++++++++ > include/drm/drm_dp_helper.h | 1 + > 2 files changed, 22 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > index 3dab3bf..9aebdf6 100644 > --- a/drivers/gpu/drm/i915/intel_dp.c > +++ b/drivers/gpu/drm/i915/intel_dp.c > @@ -1419,6 +1419,25 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp) > DRM_DEBUG_KMS("common rates: %s\n", str); > } > > +static void intel_dp_print_hw_revision(struct intel_dp *intel_dp) > +{ > + uint8_t rev; > + 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_HW_REV, &rev, 1); > + if (len < 0) > + return; > + > + DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf); > +} > + > static int rate_to_index(int find, const int *rates) > { > int i = 0; > @@ -4282,6 +4301,8 @@ intel_dp_long_pulse(struct intel_connector *intel_connector) > > intel_dp_probe_oui(intel_dp); > > + intel_dp_print_hw_revision(intel_dp); > + > intel_dp_configure_mst(intel_dp); > > if (intel_dp->is_mst) { > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > index faea76b..19ac599 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -446,6 +446,7 @@ > #define DP_SINK_OUI 0x400 > #define DP_BRANCH_OUI 0x500 > #define DP_BRANCH_ID 0x503 > +#define DP_BRANCH_HW_REV 0x509 > > #define DP_SET_POWER 0x600 > # define DP_SET_POWER_D0 0x1 > -- > 1.9.1
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3dab3bf..9aebdf6 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1419,6 +1419,25 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp) DRM_DEBUG_KMS("common rates: %s\n", str); } +static void intel_dp_print_hw_revision(struct intel_dp *intel_dp) +{ + uint8_t rev; + 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_HW_REV, &rev, 1); + if (len < 0) + return; + + DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf); +} + static int rate_to_index(int find, const int *rates) { int i = 0; @@ -4282,6 +4301,8 @@ intel_dp_long_pulse(struct intel_connector *intel_connector) intel_dp_probe_oui(intel_dp); + intel_dp_print_hw_revision(intel_dp); + intel_dp_configure_mst(intel_dp); if (intel_dp->is_mst) { diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index faea76b..19ac599 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -446,6 +446,7 @@ #define DP_SINK_OUI 0x400 #define DP_BRANCH_OUI 0x500 #define DP_BRANCH_ID 0x503 +#define DP_BRANCH_HW_REV 0x509 #define DP_SET_POWER 0x600 # define DP_SET_POWER_D0 0x1
HW revision is mandatory field for DisplayPort branch devices. This is defined in DPCD register field 0x509. 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 HW revision info to dmesg (Ville) Signed-off-by: Mika Kahola <mika.kahola@intel.com> --- drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++++++++++ include/drm/drm_dp_helper.h | 1 + 2 files changed, 22 insertions(+)