[Intel-gfx] [PATCH v3 1/3] drm/dp_helper: Define options for FRL training for HDMI2.1 PCON
Ville Syrjälä
ville.syrjala at linux.intel.com
Wed Mar 10 18:51:54 UTC 2021
On Tue, Mar 09, 2021 at 10:09:13AM +0530, Ankit Nautiyal wrote:
> Currently the FRL training mode (Concurrent, Sequential) and
> training type (Normal, Extended) are not defined properly and
> are passed as bool values in drm_helpers for pcon
> configuration for FRL training.
>
> This patch:
> -Add register masks for Sequential and Normal FRL training options.
> -Fixes the drm_helpers for FRL Training configuration to use the
> appropriate masks.
> -Modifies the calls to the above drm_helpers in i915/intel_dp as per
> the above change.
>
> v2: Re-used the register masks for these options, instead of enum. (Ville)
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/drm_dp_helper.c | 24 ++++++++++++++----------
> drivers/gpu/drm/i915/display/intel_dp.c | 10 ++++------
> include/drm/drm_dp_helper.h | 6 ++++--
> 3 files changed, 22 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index eedbb48815b7..cb2f53e56685 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -2635,14 +2635,16 @@ EXPORT_SYMBOL(drm_dp_pcon_is_frl_ready);
> * drm_dp_pcon_frl_configure_1() - Set HDMI LINK Configuration-Step1
> * @aux: DisplayPort AUX channel
> * @max_frl_gbps: maximum frl bw to be configured between PCON and HDMI sink
> - * @concurrent_mode: true if concurrent mode or operation is required,
> - * false otherwise.
> + * @frl_mode: FRL Training mode, it can be either Concurrent or Sequential.
> + * In Concurrent Mode, the FRL link bring up can be done along with
> + * DP Link training. In Sequential mode, the FRL link bring up is done prior to
> + * the DP Link training.
> *
> * Returns 0 if success, else returns negative error code.
> */
>
> int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps,
> - bool concurrent_mode)
> + u8 frl_mode)
> {
> int ret;
> u8 buf;
> @@ -2651,7 +2653,7 @@ int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps,
> if (ret < 0)
> return ret;
>
> - if (concurrent_mode)
> + if (frl_mode == DP_PCON_ENABLE_CONCURRENT_LINK)
> buf |= DP_PCON_ENABLE_CONCURRENT_LINK;
> else
> buf &= ~DP_PCON_ENABLE_CONCURRENT_LINK;
> @@ -2694,21 +2696,23 @@ EXPORT_SYMBOL(drm_dp_pcon_frl_configure_1);
> * drm_dp_pcon_frl_configure_2() - Set HDMI Link configuration Step-2
> * @aux: DisplayPort AUX channel
> * @max_frl_mask : Max FRL BW to be tried by the PCON with HDMI Sink
> - * @extended_train_mode : true for Extended Mode, false for Normal Mode.
> - * In Normal mode, the PCON tries each frl bw from the max_frl_mask starting
> - * from min, and stops when link training is successful. In Extended mode, all
> - * frl bw selected in the mask are trained by the PCON.
> + * @frl_type : FRL training type, can be Extended, or Normal.
> + * In Normal FRL training, the PCON tries each frl bw from the max_frl_mask
> + * starting from min, and stops when link training is successful. In Extended
> + * FRL training, all frl bw selected in the mask are trained by the PCON.
> *
> * Returns 0 if success, else returns negative error code.
> */
> int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask,
> - bool extended_train_mode)
> + u8 frl_type)
> {
> int ret;
> u8 buf = max_frl_mask;
>
> - if (extended_train_mode)
> + if (frl_type == DP_PCON_FRL_LINK_TRAIN_EXTENDED)
> buf |= DP_PCON_FRL_LINK_TRAIN_EXTENDED;
> + else
> + buf &= ~DP_PCON_FRL_LINK_TRAIN_EXTENDED;
>
> ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_2, buf);
> if (ret < 0)
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 4f89e0de5dde..85ec74ae952e 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2557,10 +2557,6 @@ static int intel_dp_hdmi_sink_max_frl(struct intel_dp *intel_dp)
>
> static int intel_dp_pcon_start_frl_training(struct intel_dp *intel_dp)
> {
> -#define PCON_EXTENDED_TRAIN_MODE (1 > 0)
> -#define PCON_CONCURRENT_MODE (1 > 0)
> -#define PCON_SEQUENTIAL_MODE !PCON_CONCURRENT_MODE
> -#define PCON_NORMAL_TRAIN_MODE !PCON_EXTENDED_TRAIN_MODE
> #define TIMEOUT_FRL_READY_MS 500
> #define TIMEOUT_HDMI_LINK_ACTIVE_MS 1000
>
> @@ -2594,10 +2590,12 @@ static int intel_dp_pcon_start_frl_training(struct intel_dp *intel_dp)
> return -ETIMEDOUT;
>
> max_frl_bw_mask = intel_dp_pcon_set_frl_mask(max_frl_bw);
> - ret = drm_dp_pcon_frl_configure_1(&intel_dp->aux, max_frl_bw, PCON_SEQUENTIAL_MODE);
> + ret = drm_dp_pcon_frl_configure_1(&intel_dp->aux, max_frl_bw,
> + DP_PCON_ENABLE_SEQUENTIAL_LINK);
> if (ret < 0)
> return ret;
> - ret = drm_dp_pcon_frl_configure_2(&intel_dp->aux, max_frl_bw_mask, PCON_NORMAL_TRAIN_MODE);
> + ret = drm_dp_pcon_frl_configure_2(&intel_dp->aux, max_frl_bw_mask,
> + DP_PCON_FRL_LINK_TRAIN_NORMAL);
> if (ret < 0)
> return ret;
> ret = drm_dp_pcon_frl_enable(&intel_dp->aux);
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index edffd1dcca3e..f1c7e09728d4 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1171,6 +1171,7 @@ struct drm_device;
> # define DP_PCON_ENABLE_MAX_BW_48GBPS 6
> # define DP_PCON_ENABLE_SOURCE_CTL_MODE (1 << 3)
> # define DP_PCON_ENABLE_CONCURRENT_LINK (1 << 4)
> +# define DP_PCON_ENABLE_SEQUENTIAL_LINK (0 << 4)
> # define DP_PCON_ENABLE_LINK_FRL_MODE (1 << 5)
> # define DP_PCON_ENABLE_HPD_READY (1 << 6)
> # define DP_PCON_ENABLE_HDMI_LINK (1 << 7)
> @@ -1185,6 +1186,7 @@ struct drm_device;
> # define DP_PCON_FRL_BW_MASK_40GBPS (1 << 4)
> # define DP_PCON_FRL_BW_MASK_48GBPS (1 << 5)
> # define DP_PCON_FRL_LINK_TRAIN_EXTENDED (1 << 6)
> +# define DP_PCON_FRL_LINK_TRAIN_NORMAL (0 << 6)
>
> /* PCON HDMI LINK STATUS */
> #define DP_PCON_HDMI_TX_LINK_STATUS 0x303B
> @@ -2149,9 +2151,9 @@ int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd);
> bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux);
> int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps,
> - bool concurrent_mode);
> + u8 frl_mode);
> int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask,
> - bool extended_train_mode);
> + u8 frl_type);
> int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux);
> int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux);
>
> --
> 2.29.2
--
Ville Syrjälä
Intel
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