On Tue, 06 May 2014, Damien Lespiau <damien.lespiau@xxxxxxxxx> wrote:
> On Tue, May 06, 2014 at 02:56:50PM +0300, Jani Nikula wrote:
>> From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>>
>> Even if the panel claims it can support 4 lanes, there's the
>> possibility that the HW can't, so consider this while selecting the
>> max lane count.
>>
>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> Reviewed-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Series pushed to -fixes, thanks for the swift review!
BR,
Jani.
>
> --
> Damien
>
>> ---
>> drivers/gpu/drm/i915/intel_dp.c | 20 ++++++++++++++++++--
>> 1 file changed, 18 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>> index 87b0a515d7a5..3dde9076d9d7 100644
>> --- a/drivers/gpu/drm/i915/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/intel_dp.c
>> @@ -121,6 +121,22 @@ intel_dp_max_link_bw(struct intel_dp *intel_dp)
>> return max_link_bw;
>> }
>>
>> +static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
>> +{
>> + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
>> + struct drm_device *dev = intel_dig_port->base.base.dev;
>> + u8 source_max, sink_max;
>> +
>> + source_max = 4;
>> + if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&
>> + (intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)
>> + source_max = 2;
>> +
>> + sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
>> +
>> + return min(source_max, sink_max);
>> +}
>> +
>> /*
>> * The units on the numbers in the next two are... bizarre. Examples will
>> * make it clearer; this one parallels an example in the eDP spec.
>> @@ -171,7 +187,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
>> }
>>
>> max_link_clock = drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
>> - max_lanes = drm_dp_max_lane_count(intel_dp->dpcd);
>> + max_lanes = intel_dp_max_lane_count(intel_dp);
>>
>> max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
>> mode_rate = intel_dp_link_required(target_clock, 18);
>> @@ -769,7 +785,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>> struct intel_crtc *intel_crtc = encoder->new_crtc;
>> struct intel_connector *intel_connector = intel_dp->attached_connector;
>> int lane_count, clock;
>> - int max_lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
>> + int max_lane_count = intel_dp_max_lane_count(intel_dp);
>> /* Conveniently, the link BW constants become indices with a shift...*/
>> int max_clock = intel_dp_max_link_bw(intel_dp) >> 3;
>> int bpp, mode_rate;
>> --
>> 1.9.1
>>
>> _______________________________________________
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>> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
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