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Date: Wed, 20 Oct 2021 16:52:13 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Cc: "open list:DRM DRIVER FOR MSM ADRENO GPU"
<dri-devel@...ts.freedesktop.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
freedreno <freedreno@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
Sankeerth Billakanti <sbillaka@...eaurora.org>,
Rob Clark <robdclark@...il.com>,
Sean Paul <seanpaul@...omium.org>,
Stephen Boyd <swboyd@...omium.org>,
Kalyan Thota <kalyan_t@...eaurora.org>,
Abhinav Kumar <abhinavk@...eaurora.org>,
Douglas Anderson <dianders@...omium.org>,
Kuogee Hsieh <khsieh@...eaurora.org>,
Krishna Manikandan <mkrishn@...eaurora.org>
Subject: Re: [PATCH v2 1/2] drm/msm/dp: Add support for SC7280 eDP
On Wed, 20 Oct 2021 at 15:14, Sankeerth Billakanti
<quic_sbillaka@...cinc.com> wrote:
>
> From: Sankeerth Billakanti <sbillaka@...eaurora.org>
>
> The eDP controller on SC7280 is similar to the eDP/DP controllers
> supported by the current driver implementation.
>
> SC7280 supports one EDP and one DP controller which can operate
> concurrently.
>
> The following are some required changes to support eDP on sc7280:
> 1. SC7280 eDP support in the dp_display driver.
> 2. ASSR support programming for the sink device.
> 3. SSC support programming for the sink device.
Please split your patch according to these changes. Each item should
go in a separate patch.
>
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 4 ++--
> drivers/gpu/drm/msm/dp/dp_ctrl.c | 20 ++++++++++++++++++--
> drivers/gpu/drm/msm/dp/dp_display.c | 10 +++++++++-
> 3 files changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> index ce6f32a..516cc19 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -856,9 +856,9 @@ static const struct dpu_intf_cfg sm8150_intf[] = {
> };
>
> static const struct dpu_intf_cfg sc7280_intf[] = {
> - INTF_BLK("intf_0", INTF_0, 0x34000, INTF_DP, 0, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 24, 25),
> + INTF_BLK("intf_0", INTF_0, 0x34000, INTF_DP, 1, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 24, 25),
> INTF_BLK("intf_1", INTF_1, 0x35000, INTF_DSI, 0, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 26, 27),
> - INTF_BLK("intf_5", INTF_5, 0x39000, INTF_EDP, 0, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 22, 23),
> + INTF_BLK("intf_5", INTF_5, 0x39000, INTF_DP, 0, 24, INTF_SC7280_MASK, MDP_SSPP_TOP0_INTR, 22, 23),
Why does intf_0 receive index 1? I think you have a mistake in the
dp_descs below.
Also note that the latest patch started using MSM_DP_CONTROLLER_n
symbols instead of using raw numbers.
> };
>
> /*************************************************************
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index 62e75dc..9fea49c 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -119,7 +119,7 @@ void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
> static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
> {
> u32 config = 0, tbd;
> - u8 *dpcd = ctrl->panel->dpcd;
> + const u8 *dpcd = ctrl->panel->dpcd;
>
> /* Default-> LSCLK DIV: 1/4 LCLK */
> config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT);
> @@ -1228,7 +1228,9 @@ static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
> int *training_step)
> {
> int ret = 0;
> + const u8 *dpcd = ctrl->panel->dpcd;
> u8 encoding = DP_SET_ANSI_8B10B;
> + u8 ssc, assr;
> struct dp_link_info link_info = {0};
>
> dp_ctrl_config_ctrl(ctrl);
> @@ -1238,9 +1240,21 @@ static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
> link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;
>
> dp_aux_link_configure(ctrl->aux, &link_info);
> +
> + if (dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
> + ssc = DP_SPREAD_AMP_0_5;
> + drm_dp_dpcd_write(ctrl->aux, DP_DOWNSPREAD_CTRL, &ssc, 1);
> + }
> +
> drm_dp_dpcd_write(ctrl->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
> &encoding, 1);
>
> + if (dpcd[DP_EDP_CONFIGURATION_CAP] & DP_ALTERNATE_SCRAMBLER_RESET_CAP) {
> + assr = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
> + drm_dp_dpcd_write(ctrl->aux, DP_EDP_CONFIGURATION_SET,
> + &assr, 1);
> + }
> +
> ret = dp_ctrl_link_train_1(ctrl, training_step);
> if (ret) {
> DRM_ERROR("link training #1 failed. ret=%d\n", ret);
> @@ -1312,9 +1326,11 @@ static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
> struct dp_io *dp_io = &ctrl->parser->io;
> struct phy *phy = dp_io->phy;
> struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;
> + const u8 *dpcd = ctrl->panel->dpcd;
>
> opts_dp->lanes = ctrl->link->link_params.num_lanes;
> opts_dp->link_rate = ctrl->link->link_params.rate / 100;
> + opts_dp->ssc = dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5;
> dp_ctrl_set_clock_rate(ctrl, DP_CTRL_PM, "ctrl_link",
> ctrl->link->link_params.rate * 1000);
>
> @@ -1406,7 +1422,7 @@ void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
>
> static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
> {
> - u8 *dpcd = ctrl->panel->dpcd;
> + const u8 *dpcd = ctrl->panel->dpcd;
>
> /*
> * For better interop experience, used a fixed NVID=0x8000
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index c867745..c16311b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -144,8 +144,16 @@ static const struct msm_dp_config sc8180x_dp_cfg = {
> .num_descs = 3,
> };
>
> +static const struct msm_dp_config sc7280_dp_cfg = {
> + .descs = (struct msm_dp_desc[]) {
> + { .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP },
I think you'd want to have sc7280-dp using DP_CONTROLLER_0 and
sc7280-edp using DP_CONTROLLER_1. See latest Bjorn's patches.
> + },
> + .num_descs = 1,
> +};
> +
> static const struct of_device_id dp_dt_match[] = {
> { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
> + { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_cfg },
> { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_cfg },
> { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_cfg },
> {}
> @@ -1440,7 +1448,7 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display)
>
> dp_hpd_event_setup(dp);
>
> - dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
> + dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 1);
> }
>
> void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
> --
> The Qualcomm Innovatin Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
>
--
With best wishes
Dmitry
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