From: Harry Wentland <harry.wentland@amd.com>
To: Wayne Lin <Wayne.Lin@amd.com>, amd-gfx@lists.freedesktop.org
Cc: alexander.deucher@amd.com, nicholas.kazlauskas@amd.com,
Rodrigo.Siqueira@amd.com, stylon.wang@amd.com, jude.shih@amd.com,
jimmy.kizito@amd.com, meenakshikumar.somasundaram@amd.com,
Jun Lei <Jun.Lei@amd.com>
Subject: Re: [PATCH v2 07/23] drm/amd/display: Update training parameters for DPIA links
Date: Tue, 5 Oct 2021 11:58:44 -0400 [thread overview]
Message-ID: <892bc0cb-3593-071c-388e-d8eeb87be08c@amd.com> (raw)
In-Reply-To: <20211005075205.3467938-8-Wayne.Lin@amd.com>
On 2021-10-05 03:51, Wayne Lin wrote:
> From: Jimmy Kizito <Jimmy.Kizito@amd.com>
>
> [why & how]
> Add codes for commit "ede4f6dac99e drm/amd/display: Update
> setting of DP training parameters." to support USB4 DP tunneling
> feature
>
Suggested title: Skip DPCD read for DPTX-to-DPIA hop
Suggested description: Driver does not need to train the first hop.
Harry
> Reviewed-by: Jun Lei <Jun.Lei@amd.com>
> Acked-by: Wayne Lin <Wayne.Lin@amd.com>
> Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
> Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
> ---
> drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> index 9bc5f49ea2ec..dd1d0262ba40 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> @@ -1777,6 +1777,13 @@ static enum dc_status configure_lttpr_mode_non_transparent(
>
> if (encoding == DP_8b_10b_ENCODING) {
> repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
> +
> + /* Driver does not need to train the first hop. Skip DPCD read and clear
> + * AUX_RD_INTERVAL for DPTX-to-DPIA hop.
> + */
> + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
> + link->dpcd_caps.lttpr_caps.aux_rd_interval[--repeater_cnt] = 0;
> +
> for (repeater_id = repeater_cnt; repeater_id > 0; repeater_id--) {
> aux_interval_address = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1 +
> ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (repeater_id - 1));
>
next prev parent reply other threads:[~2021-10-05 15:58 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-05 7:51 [PATCH v2 00/23] USB4 DP tunneling Wayne Lin
2021-10-05 7:51 ` [PATCH v2 01/23] drm/amd/display: Update link encoder object creation Wayne Lin
2021-10-05 14:15 ` Harry Wentland
2021-10-05 15:13 ` Harry Wentland
2021-10-05 7:51 ` [PATCH v2 02/23] drm/amd/display: USB4 DPIA enumeration and AUX Tunneling Wayne Lin
2021-10-05 7:51 ` [PATCH v2 03/23] drm/amd/display: Support for DMUB HPD and HPD RX interrupt handling Wayne Lin
2021-10-05 7:51 ` [PATCH v2 04/23] drm/amd/display: Support USB4 dynamic link encoder selection Wayne Lin
2021-10-05 15:46 ` Harry Wentland
2021-10-05 7:51 ` [PATCH v2 05/23] drm/amd/display: Support USB4 for display endpoint control path Wayne Lin
2021-10-05 15:50 ` Harry Wentland
2021-10-05 7:51 ` [PATCH v2 06/23] drm/amd/display: Support DP tunneling when DPRX detection Wayne Lin
2021-10-05 15:57 ` Harry Wentland
2021-10-05 7:51 ` [PATCH v2 07/23] drm/amd/display: Update training parameters for DPIA links Wayne Lin
2021-10-05 15:58 ` Harry Wentland [this message]
2021-10-05 7:51 ` [PATCH v2 08/23] drm/amd/display: Support USB4 when DP link training Wayne Lin
2021-10-05 15:59 ` Harry Wentland
2021-10-05 7:51 ` [PATCH v2 09/23] drm/amd/display: Implement DPIA training loop Wayne Lin
2021-10-05 7:51 ` [PATCH v2 10/23] drm/amd/display: Implement DPIA link configuration Wayne Lin
2021-10-05 7:51 ` [PATCH v2 11/23] drm/amd/display: Implement DPIA clock recovery phase Wayne Lin
2021-10-07 10:00 ` Mike Lothian
2021-10-08 8:32 ` Lin, Wayne
2021-10-05 7:51 ` [PATCH v2 12/23] drm/amd/display: Implement DPIA equalisation phase Wayne Lin
2021-10-05 7:51 ` [PATCH v2 13/23] drm/amd/display: Implement end of training for hop in DPIA display path Wayne Lin
2021-10-05 7:51 ` [PATCH v2 14/23] drm/amd/display: Support for SET_CONFIG processing with DMUB Wayne Lin
2021-10-05 7:51 ` [PATCH v2 15/23] drm/amd/display: Read USB4 DP tunneling data from DPCD Wayne Lin
2021-10-05 7:51 ` [PATCH v2 16/23] drm/amd/display: Add dpia debug options Wayne Lin
2021-10-05 7:51 ` [PATCH v2 17/23] drm/amd/display: Support for SET_CONFIG processing with DMUB Wayne Lin
2021-10-05 7:52 ` [PATCH v2 18/23] drm/amd/display: Fix DIG_HPD_SELECT for USB4 display endpoints Wayne Lin
2021-10-05 7:52 ` [PATCH v2 19/23] drm/amd/display: Add debug flags for USB4 DP link training Wayne Lin
2021-10-05 17:10 ` Harry Wentland
2021-10-06 10:14 ` Lin, Wayne
2021-10-06 14:02 ` Harry Wentland
2021-10-07 9:22 ` Lin, Wayne
2021-10-05 7:52 ` [PATCH v2 20/23] drm/amd/display: Fix for access for ddc pin and aux engine Wayne Lin
2021-10-05 7:52 ` [PATCH v2 21/23] drm/amd/display: Deadlock/HPD Status/Crash Bug Fix Wayne Lin
2021-10-05 7:52 ` [PATCH v2 22/23] drm/amd/display: Fix USB4 Aux via DMUB terminate unexpectedly Wayne Lin
2021-10-05 7:52 ` [PATCH v2 23/23] drm/amd/display: USB4 bring up set correct address Wayne Lin
2021-10-05 17:13 ` [PATCH v2 00/23] USB4 DP tunneling Harry Wentland
2021-10-06 10:14 ` Lin, Wayne
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