On Thu, Apr 06, 2017 at 04:44:09PM +0300, Jani Nikula wrote:
> Looking at DPCD DP_MAX_LINK_RATE may be completely bogus for eDP 1.4
> which is allowed to use link rate select method and have 0 in max link
> rate. With this change, it makes sense to store the max rate as the
> actual rate rather than as a bw code.
>
> Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 28 +++++++---------------------
> drivers/gpu/drm/i915/intel_drv.h | 2 +-
> 2 files changed, 8 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index b38cba7d5abc..e4650f1625cc 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -161,23 +161,9 @@ static void intel_dp_set_sink_rates(struct intel_dp *intel_dp)
> intel_dp->num_sink_rates = num_rates;
> }
>
> -static int
> -intel_dp_max_link_bw(struct intel_dp *intel_dp)
> +static int intel_dp_max_sink_rate(struct intel_dp *intel_dp)
> {
> - int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
> -
> - switch (max_link_bw) {
> - case DP_LINK_BW_1_62:
> - case DP_LINK_BW_2_7:
> - case DP_LINK_BW_5_4:
> - break;
> - default:
> - WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n",
> - max_link_bw);
> - max_link_bw = DP_LINK_BW_1_62;
> - break;
> - }
> - return max_link_bw;
> + return intel_dp->sink_rates[intel_dp->num_sink_rates - 1];
> }
>
> static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
> @@ -301,7 +287,7 @@ static int intel_dp_rate_index(const int *rates, int len, int rate)
> static int intel_dp_common_rates(struct intel_dp *intel_dp,
> int *common_rates)
> {
> - int max_rate = drm_dp_bw_code_to_link_rate(intel_dp->max_sink_link_bw);
> + int max_rate = intel_dp->max_sink_link_rate;
> int i, common_len;
>
> common_len = intersect_rates(intel_dp->source_rates,
> @@ -339,10 +325,10 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
> common_rates,
> link_rate);
> if (link_rate_index > 0) {
> - intel_dp->max_sink_link_bw = drm_dp_link_rate_to_bw_code(common_rates[link_rate_index - 1]);
> + intel_dp->max_sink_link_rate = common_rates[link_rate_index - 1];
> intel_dp->max_sink_lane_count = lane_count;
> } else if (lane_count > 1) {
> - intel_dp->max_sink_link_bw = intel_dp_max_link_bw(intel_dp);
> + intel_dp->max_sink_link_rate = intel_dp_max_sink_rate(intel_dp);
> intel_dp->max_sink_lane_count = lane_count >> 1;
> } else {
> DRM_ERROR("Link Training Unsuccessful\n");
> @@ -4652,8 +4638,8 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
> /* Set the max lane count for sink */
> intel_dp->max_sink_lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
>
> - /* Set the max link BW for sink */
> - intel_dp->max_sink_link_bw = intel_dp_max_link_bw(intel_dp);
> + /* Set the max link rate for sink */
> + intel_dp->max_sink_link_rate = intel_dp_max_sink_rate(intel_dp);
>
> intel_dp->reset_link_params = false;
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 7bc0c25b3396..92e353dc61bf 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -959,7 +959,7 @@ struct intel_dp {
> /* Max lane count for the sink as per DPCD registers */
> uint8_t max_sink_lane_count;
> /* Max link BW for the sink as per DPCD registers */
> - int max_sink_link_bw;
> + int max_sink_link_rate;
> /* sink or branch descriptor */
> struct intel_dp_desc desc;
> struct drm_dp_aux aux;
> --
> 2.1.4
--
Ville Syrjälä
Intel OTC
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