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Date: Tue, 1 Feb 2022 06:55:13 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc: robdclark@...il.com, sean@...rly.run, swboyd@...omium.org,
vkoul@...nel.org, daniel@...ll.ch, airlied@...ux.ie,
agross@...nel.org, bjorn.andersson@...aro.org,
quic_abhinavk@...cinc.com, aravindh@...eaurora.org,
freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dp: add wide bus support
On Tue, 1 Feb 2022 at 06:16, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On Tue, 1 Feb 2022 at 01:24, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
> >
> >
> > On 1/28/2022 8:59 PM, Dmitry Baryshkov wrote:
> > > Hi,
> > >
> > > Thank you for your patch.
> > >
> > > On Fri, 28 Jan 2022 at 20:29, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
> > >> Normally, mdp will push one pixel of data per pixel clock to
> > >> interface to display. Wide bus feature will increase bus
> > >> width from 32 bits to 64 bits so that it can push two
> > >> pixel of data per pixel clock to interface to display.
> > >> This feature is pre requirement to support 4k resolution.
> > >>
> > >> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> > >> ---
> > >> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 16 ++-
> > >> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 2 +
> > >> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 14 +++
> > >> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c | 108 +++++++++++++++------
> > >> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h | 5 +
> > >> drivers/gpu/drm/msm/dp/dp_catalog.c | 11 ++-
> > >> drivers/gpu/drm/msm/dp/dp_catalog.h | 1 +
> > >> drivers/gpu/drm/msm/dp/dp_ctrl.c | 9 +-
> > >> drivers/gpu/drm/msm/dp/dp_ctrl.h | 1 +
> > >> drivers/gpu/drm/msm/dp/dp_display.c | 17 ++++
> > >> drivers/gpu/drm/msm/dp/dp_display.h | 3 +
> > >> drivers/gpu/drm/msm/dp/dp_parser.c | 26 +++++
> > >> drivers/gpu/drm/msm/dp/dp_parser.h | 2 +
> > >> drivers/gpu/drm/msm/msm_drv.h | 9 ++
> > > Can we get this split into logical chunks please?
> > >
> > >> 14 files changed, 190 insertions(+), 34 deletions(-)
> > >>
> > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > >> index 1e648db..e2fb5bc 100644
> > >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > >> @@ -199,6 +199,8 @@ struct dpu_encoder_virt {
> > >>
> > >> struct msm_display_info disp_info;
> > >>
> > >> + struct msm_op_info op_info;
> > >> +
> > >> bool idle_pc_supported;
> > >> struct mutex rc_lock;
> > >> enum dpu_enc_rc_states rc_state;
> > >> @@ -217,6 +219,13 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
> > >> 15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
> > >> };
> > >>
> > >> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc)
> > >> +{
> > >> + struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> > >> +
> > >> + return dpu_enc->op_info.wide_bus_en;
> > >> +}
> > >> +
> > >> static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
> > >> {
> > >> struct dpu_hw_dither_cfg dither_cfg = { 0 };
> > >> @@ -2112,6 +2121,7 @@ int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
> > >> struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
> > >> struct drm_encoder *drm_enc = NULL;
> > >> struct dpu_encoder_virt *dpu_enc = NULL;
> > >> + struct msm_op_info *op_info;
> > >> int ret = 0;
> > >>
> > >> dpu_enc = to_dpu_encoder_virt(enc);
> > >> @@ -2128,8 +2138,12 @@ int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
> > >> timer_setup(&dpu_enc->vsync_event_timer,
> > >> dpu_encoder_vsync_event_handler,
> > >> 0);
> > >> - else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS)
> > >> + else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS) {
> > >> dpu_enc->dp = priv->dp[disp_info->h_tile_instance[0]];
> > >> + op_info = &priv->op_info[disp_info->h_tile_instance[0]];
> > > op_info should be defined per INTF rather than per h_tile. This way
> > > you won't have to check for intf_type here.
> >
> > The more i am thinking, the more i think op_info should be along with
> > controller.
> >
> > widebus belongs to mdp fetching process and intf only care of raw bit
> > stream. it has nothing to do with intf.
>
> Technically yes. However having it per INTF (or per encoder) might
> simplify things (as you won't have to check for the encoder type in
> the code afterwards).
> I'd say, you can define it inside msm_dp somewhere and then query it
> from dpu_encoder_setup() using the new function. Afterwards you don't
> have to worry about the INTF type at all. You have the correct value
> for DP and for the DSI it's false.
After even more thought, a slightly different suggestion: add
wide_bus_enabled to struct msm_display_info and set it in the
_dpu_kms_initialize_displayport().
>
> >
> > The other problem is we can not access inside of prov->dp here.
>
> You can always add msm_dp_has_widebus_enabled() function.
>
> >
> >
> >
> > >
> > >> + dpu_enc->op_info = *op_info;
> > > So... we set this data in msm_drm_private only to copy it to
> > > dpu_encoder_virt? Please don't do this.
> > > Allow one to query the data from the DP rather than blindly copying it
> > > over and over again.
> >
> > Is this only copy one time? maybe change to pointer work better?
>
> This is the only time we copy op_info, this is true. The wide_bus_en
> is copied 5 times, if I'm not mistaken.
>
> >
> > >> +
> > >> + }
> > >>
> > >> INIT_DELAYED_WORK(&dpu_enc->delayed_off_work,
> > >> dpu_encoder_off_work);
> > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > >> index e241914..0d73550 100644
> > >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> > >> @@ -168,4 +168,6 @@ int dpu_encoder_get_linecount(struct drm_encoder *drm_enc);
> > >> */
> > >> int dpu_encoder_get_vsync_count(struct drm_encoder *drm_enc);
> > >>
> > >> +bool dpu_encoder_is_widebus_enabled(struct drm_encoder *drm_enc);
> > >> +
> > >> #endif /* __DPU_ENCODER_H__ */
> > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> > >> index ddd9d89..04ac2dc 100644
> > >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> > >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> > >> @@ -110,6 +110,20 @@ static void drm_mode_to_intf_timing_params(
> > >> timing->v_back_porch += timing->v_front_porch;
> > >> timing->v_front_porch = 0;
> > >> }
> > >> +
> > >> + timing->wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
> > >> +
> > >> + /*
> > >> + * for DP, divide the horizonal parameters by 2 when
> > >> + * widebus is enabled
> > >> + */
> > >> + if (phys_enc->hw_intf->cap->type == INTF_DP && timing->wide_bus_en) {
> > > What about INTF_eDP?
> > > I suspect that intf type check is unnecessary here.
> > >
> > >> + timing->width = timing->width >> 1;
> > >> + timing->xres = timing->xres >> 1;
> > >> + timing->h_back_porch = timing->h_back_porch >> 1;
> > >> + timing->h_front_porch = timing->h_front_porch >> 1;
> > >> + timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
> > >> + }
> > >> }
> > >>
> > >> static u32 get_horizontal_total(const struct intf_timing_params *timing)
> > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> > >> index 116e2b5..f072bd5 100644
> > >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> > >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> > >> @@ -33,6 +33,7 @@
> > >> #define INTF_TP_COLOR1 0x05C
> > >> #define INTF_CONFIG2 0x060
> > >> #define INTF_DISPLAY_DATA_HCTL 0x064
> > >> +#define INTF_ACTIVE_DATA_HCTL 0x068
> > >> #define INTF_FRAME_LINE_COUNT_EN 0x0A8
> > >> #define INTF_FRAME_COUNT 0x0AC
> > >> #define INTF_LINE_COUNT 0x0B0
> > >> @@ -90,67 +91,109 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
> > >> u32 hsync_period, vsync_period;
> > >> u32 display_v_start, display_v_end;
> > >> u32 hsync_start_x, hsync_end_x;
> > >> + u32 hsync_data_start_x, hsync_data_end_x;
> > >> u32 active_h_start, active_h_end;
> > >> u32 active_v_start, active_v_end;
> > >> u32 active_hctl, display_hctl, hsync_ctl;
> > >> u32 polarity_ctl, den_polarity, hsync_polarity, vsync_polarity;
> > >> u32 panel_format;
> > >> - u32 intf_cfg, intf_cfg2 = 0, display_data_hctl = 0;
> > >> + u32 intf_cfg, intf_cfg2 = 0;
> > >> + u32 display_data_hctl = 0, active_data_hctl = 0;
> > >> + u32 data_width;
> > >> + bool dp_intf = false;
> > >>
> > >> /* read interface_cfg */
> > >> intf_cfg = DPU_REG_READ(c, INTF_CONFIG);
> > >> +
> > >> + if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP)
> > >> + dp_intf = true;
> > >> +
> > >> hsync_period = p->hsync_pulse_width + p->h_back_porch + p->width +
> > >> p->h_front_porch;
> > >> vsync_period = p->vsync_pulse_width + p->v_back_porch + p->height +
> > >> p->v_front_porch;
> > >>
> > >> display_v_start = ((p->vsync_pulse_width + p->v_back_porch) *
> > >> - hsync_period) + p->hsync_skew;
> > >> + hsync_period) + p->hsync_skew;
> > > Unnecessary whitespace changes complicate reviewing. I'll try groking
> > > this piece of code later.
> > >
> > >> display_v_end = ((vsync_period - p->v_front_porch) * hsync_period) +
> > >> - p->hsync_skew - 1;
> > >> + p->hsync_skew - 1;
> > >> +
> > >> + hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
> > >>
> > >> hsync_start_x = p->h_back_porch + p->hsync_pulse_width;
> > >> hsync_end_x = hsync_period - p->h_front_porch - 1;
> > >>
> > >> - if (p->width != p->xres) {
> > >> - active_h_start = hsync_start_x;
> > >> - active_h_end = active_h_start + p->xres - 1;
> > >> - } else {
> > >> - active_h_start = 0;
> > >> - active_h_end = 0;
> > >> - }
> > >> + /*
> > >> + * DATA_HCTL_EN controls data timing which can be different from
> > >> + * video timing. It is recommended to enable it for all cases, except
> > >> + * if compression is enabled in 1 pixel per clock mode
> > >> + */
> > >> + if (!p->compression_en || p->wide_bus_en)
> > >> + intf_cfg2 |= BIT(4);
> > >>
> > >> - if (p->height != p->yres) {
> > >> - active_v_start = display_v_start;
> > >> - active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> > >> - } else {
> > >> - active_v_start = 0;
> > >> - active_v_end = 0;
> > >> - }
> > >> + if (p->wide_bus_en)
> > >> + intf_cfg2 |= BIT(0);
> > >> +
> > >> + /*
> > >> + * If widebus is disabled:
> > >> + * For uncompressed stream, the data is valid for the entire active
> > >> + * window period.
> > >> + * For compressed stream, data is valid for a shorter time period
> > >> + * inside the active window depending on the compression ratio.
> > >> + *
> > >> + * If widebus is enabled:
> > >> + * For uncompressed stream, data is valid for only half the active
> > >> + * window, since the data rate is doubled in this mode.
> > >> + * p->width holds the adjusted width for DP but unadjusted width for DSI
> > >> + * For compressed stream, data validity window needs to be adjusted for
> > >> + * compression ratio and then further halved.
> > >> + */
> > >> + data_width = p->width;
> > >> +
> > >> + if (p->compression_en) {
> > >> + data_width = DIV_ROUND_UP(p->dce_bytes_per_line, 3);
> > >>
> > >> - if (active_h_end) {
> > >> - active_hctl = (active_h_end << 16) | active_h_start;
> > >> - intf_cfg |= BIT(29); /* ACTIVE_H_ENABLE */
> > >> + if (p->wide_bus_en)
> > >> + data_width >>= 1;
> > >> + } else if (!dp_intf && p->wide_bus_en) {
> > >> + data_width = p->width >> 1;
> > >> } else {
> > >> - active_hctl = 0;
> > >> + data_width = p->width;
> > >> }
> > >>
> > >> - if (active_v_end)
> > >> - intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
> > >> + hsync_data_start_x = hsync_start_x;
> > >> + hsync_data_end_x = hsync_start_x + data_width - 1;
> > >>
> > >> - hsync_ctl = (hsync_period << 16) | p->hsync_pulse_width;
> > >> display_hctl = (hsync_end_x << 16) | hsync_start_x;
> > >> + display_data_hctl = (hsync_data_end_x << 16) | hsync_data_start_x;
> > >>
> > >> - if (ctx->cap->type == INTF_EDP || ctx->cap->type == INTF_DP) {
> > >> - active_h_start = hsync_start_x;
> > >> - active_h_end = active_h_start + p->xres - 1;
> > >> - active_v_start = display_v_start;
> > >> - active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> > >> -
> > >> + if (dp_intf) {
> > >> + // DP timing adjustment
> > >> display_v_start += p->hsync_pulse_width + p->h_back_porch;
> > >> + display_v_end -= p->h_front_porch;
> > >> + }
> > >>
> > >> - active_hctl = (active_h_end << 16) | active_h_start;
> > >> +
> > >> + active_h_start = hsync_start_x;
> > >> + active_h_end = active_h_start + p->xres - 1;
> > >> +
> > >> + active_v_start = display_v_start;
> > >> + active_v_end = active_v_start + (p->yres * hsync_period) - 1;
> > >> +
> > >> + intf_cfg |= BIT(29); /* ACTIVE_H_ENABLE */
> > >> + intf_cfg |= BIT(30); /* ACTIVE_V_ENABLE */
> > >> +
> > >> + active_hctl = (active_h_end << 16) | active_h_start;
> > >> +
> > >> + if (dp_intf) {
> > >> display_hctl = active_hctl;
> > >> + if (p->compression_en) {
> > > I assume that compression_en is a part of DSC support for the DP, isn't it?
> > > If so, it should definitely come as a separate patch.
> > >
> > >> + active_data_hctl = (hsync_start_x +
> > >> + p->extra_dto_cycles) << 16;
> > >> + active_data_hctl += hsync_start_x;
> > >> +
> > >> + display_data_hctl = active_data_hctl;
> > >> + }
> > >> }
> > >>
> > >> den_polarity = 0;
> > >> @@ -204,6 +247,9 @@ static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
> > >> DPU_REG_WRITE(c, INTF_FRAME_LINE_COUNT_EN, 0x3);
> > >> DPU_REG_WRITE(c, INTF_CONFIG, intf_cfg);
> > >> DPU_REG_WRITE(c, INTF_PANEL_FORMAT, panel_format);
> > >> + DPU_REG_WRITE(c, INTF_CONFIG2, intf_cfg2);
> > >> + DPU_REG_WRITE(c, INTF_DISPLAY_DATA_HCTL, display_data_hctl);
> > >> + DPU_REG_WRITE(c, INTF_ACTIVE_DATA_HCTL, active_data_hctl);
> > > Are these registers present on all supported hardware (like sdm845)?
> > > Does msm8998 support them? msm8996?
> > >
> > >> }
> > >>
> > >> static void dpu_hw_intf_enable_timing_engine(
> > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> > >> index 3568be8..8fc71ce 100644
> > >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> > >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> > >> @@ -30,6 +30,11 @@ struct intf_timing_params {
> > >> u32 border_clr;
> > >> u32 underflow_clr;
> > >> u32 hsync_skew;
> > >> +
> > >> + bool wide_bus_en;
> > >> + bool compression_en;
> > >> + u32 extra_dto_cycles; /* for DP only */
> > >> + u32 dce_bytes_per_line;
> > > All compression-related items should come in a separate patch.
> > >
> > >> };
> > >>
> > >> struct intf_prog_fetch {
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
> > >> index 6d6850e..d738e2e 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> > >> @@ -745,6 +745,7 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
> > >> {
> > >> struct dp_catalog_private *catalog = container_of(dp_catalog,
> > >> struct dp_catalog_private, dp_catalog);
> > >> + u32 reg;
> > >>
> > >> dp_write_link(catalog, REG_DP_TOTAL_HOR_VER,
> > >> dp_catalog->total);
> > >> @@ -753,7 +754,15 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
> > >> dp_write_link(catalog, REG_DP_HSYNC_VSYNC_WIDTH_POLARITY,
> > >> dp_catalog->width_blanking);
> > >> dp_write_link(catalog, REG_DP_ACTIVE_HOR_VER, dp_catalog->dp_active);
> > >> - dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, 0);
> > >> +
> > >> + reg = dp_read_p0(catalog, MMSS_DP_INTF_CONFIG);
> > >> +
> > >> + if (dp_catalog->wide_bus_en)
> > >> + reg |= BIT(4);
> > >> + else
> > >> + reg &= ~BIT(4);
> > >> +
> > >> + dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, reg);
> > >> return 0;
> > >> }
> > >>
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
> > >> index 7dea101..6ca563f 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> > >> @@ -70,6 +70,7 @@ struct dp_catalog {
> > >> enum dp_catalog_audio_sdp_type sdp_type;
> > >> enum dp_catalog_audio_header_type sdp_header;
> > >> u32 audio_data;
> > >> + bool wide_bus_en;
> > >> };
> > >>
> > >> /* Debug module */
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> > >> index 53ad3af..401ae57 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> > >> @@ -1812,6 +1812,7 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
> > >> int ret = 0;
> > >> bool mainlink_ready = false;
> > >> struct dp_ctrl_private *ctrl;
> > >> + u32 pixel_rate_orig;
> > >>
> > >> if (!dp_ctrl)
> > >> return -EINVAL;
> > >> @@ -1820,6 +1821,10 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
> > >>
> > >> ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
> > >>
> > >> + pixel_rate_orig = ctrl->dp_ctrl.pixel_rate;
> > >> + if (dp_ctrl->wide_bus_en)
> > >> + ctrl->dp_ctrl.pixel_rate >>= 1;
> > >> +
> > >> drm_dbg_dp((struct drm_device *)NULL, "rate=%d, num_lanes=%d, pixel_rate=%d\n",
> > >> ctrl->link->link_params.rate,
> > >> ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);
> > >> @@ -1855,11 +1860,13 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
> > >> */
> > >> reinit_completion(&ctrl->video_comp);
> > >>
> > >> + ctrl->catalog->wide_bus_en = dp_ctrl->wide_bus_en;
> > > Can you limit the DP's knowledge of wide_bus_en to a single place
> > > (e.g. only in dp_catalog or in dp_ctrl)? Just copying the data bit
> > > means that we have two places which must be kept in sync.
> > >
> > >> +
> > >> dp_ctrl_configure_source_params(ctrl);
> > >>
> > >> dp_catalog_ctrl_config_msa(ctrl->catalog,
> > >> ctrl->link->link_params.rate,
> > >> - ctrl->dp_ctrl.pixel_rate, dp_ctrl_use_fixed_nvid(ctrl));
> > >> + pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl));
> > >>
> > >> dp_ctrl_setup_tr_unit(ctrl);
> > >>
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> > >> index 2433edb..4dff44d 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
> > >> @@ -17,6 +17,7 @@ struct dp_ctrl {
> > >> bool orientation;
> > >> atomic_t aborted;
> > >> u32 pixel_rate;
> > >> + bool wide_bus_en;
> > >> };
> > >>
> > >> int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl);
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> > >> index f89f3ed..924c9e2 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> > >> @@ -873,6 +873,8 @@ static int dp_display_enable(struct dp_display_private *dp, u32 data)
> > >> return 0;
> > >> }
> > >>
> > >> + dp->ctrl->wide_bus_en = dp_display->wide_bus_en;
> > > Ugh. This adds a third place. dp_display, dp_ctrl and dp_catalog. Too
> > > much for a single bit.
> > >
> > >> +
> > >> rc = dp_ctrl_on_stream(dp->ctrl);
> > >> if (!rc)
> > >> dp_display->power_on = true;
> > >> @@ -1004,6 +1006,8 @@ int dp_display_get_modes(struct msm_dp *dp,
> > >> dp->connector, dp_mode);
> > >> if (dp_mode->drm_mode.clock)
> > >> dp->max_pclk_khz = dp_mode->drm_mode.clock;
> > >> +
> > >> + DRM_DEBUG_DP("wide_bus_en=%d\n", dp->wide_bus_en);
> > >> return ret;
> > >> }
> > >>
> > >> @@ -1503,6 +1507,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> > >> {
> > >> struct msm_drm_private *priv;
> > >> struct dp_display_private *dp_priv;
> > >> + struct msm_op_info *op;
> > >> + struct dp_display_private *dp;
> > >> int ret;
> > >>
> > >> if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
> > >> @@ -1545,6 +1551,17 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> > >>
> > >> priv->bridges[priv->num_bridges++] = dp_display->bridge;
> > >>
> > >> + dp = container_of(dp_display, struct dp_display_private, dp_display);
> > >> +
> > >> + dp_display->wide_bus_en = dp->parser->has_widebus;
> > >> + dp_display->compression_en = dp->parser->has_compression;
> > >> +
> > >> + op = &priv->op_info[dp->id];
> > >> + op->wide_bus_en = dp_display->wide_bus_en;
> > >> + op->compression_en = dp_display->compression_en;
> > >> +
> > >> + drm_dbg_dp(dp->drm_dev, "id=%d widebus=%d compression=%d\n",
> > >> + dp->id, op->wide_bus_en, op->compression_en);
> > >> return 0;
> > >> }
> > >>
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> > >> index e3adcd5..b1057cb 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> > >> @@ -24,6 +24,9 @@ struct msm_dp {
> > >>
> > >> hdmi_codec_plugged_cb plugged_cb;
> > >>
> > >> + bool wide_bus_en;
> > >> + bool compression_en;
> > >> +
> > >> u32 max_pclk_khz;
> > >>
> > >> u32 max_dp_lanes;
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
> > >> index e74012d..fd48eb8 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> > >> @@ -286,6 +286,28 @@ static int dp_parser_find_panel(struct dp_parser *parser)
> > >> return 0;
> > >> }
> > >>
> > >> +static void dp_parser_compression(struct dp_parser *parser)
> > >> +{
> > >> + struct device *dev = &parser->pdev->dev;
> > >> +
> > >> + parser->has_compression = of_property_read_bool(dev->of_node,
> > >> + "qcom,compression-enable");
> > >> +
> > >> + DRM_DEBUG_DP("compression parsing successful. compression:%d\n",
> > >> + parser->has_compression);
> > >> +}
> > >> +
> > >> +static void dp_parser_widebus(struct dp_parser *parser)
> > >> +{
> > >> + struct device *dev = &parser->pdev->dev;
> > >> +
> > >> + parser->has_widebus = of_property_read_bool(dev->of_node,
> > >> + "qcom,widebus-enable");
> > >> +
> > >> + DRM_DEBUG_DP("widebus parsing successful. widebus:%d\n",
> > >> + parser->has_widebus);
> > >> +}
> > > All new properties should be described in the dt-bindings document.
> > >
> > > However I have a bigger question here. Who and how decides whether
> > > compression or widebus should be enabled?
> > >
> > > Should we enable widebus for all generations that support it? If so,
> > > this should be a part of msm_dp_config rather than the DTS property.
> > > And I'm completely puzzled about the compression-enable here.
> > >
> > >
> > >> +
> > >> static int dp_parser_parse(struct dp_parser *parser, int connector_type)
> > >> {
> > >> int rc = 0;
> > >> @@ -319,6 +341,10 @@ static int dp_parser_parse(struct dp_parser *parser, int connector_type)
> > >> */
> > >> parser->regulator_cfg = &sdm845_dp_reg_cfg;
> > >>
> > >> + dp_parser_widebus(parser);
> > >> +
> > >> + dp_parser_compression(parser);
> > >> +
> > >> return 0;
> > >> }
> > >>
> > >> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h
> > >> index 3172da0..7531fe2 100644
> > >> --- a/drivers/gpu/drm/msm/dp/dp_parser.h
> > >> +++ b/drivers/gpu/drm/msm/dp/dp_parser.h
> > >> @@ -123,6 +123,8 @@ struct dp_parser {
> > >> struct dp_display_data disp_data;
> > >> const struct dp_regulator_cfg *regulator_cfg;
> > >> u32 max_dp_lanes;
> > >> + bool has_widebus;
> > >> + bool has_compression;
> > >> struct drm_bridge *panel_bridge;
> > >>
> > >> int (*parse)(struct dp_parser *parser, int connector_type);
> > >> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> > >> index d7574e6..1a5f3e9 100644
> > >> --- a/drivers/gpu/drm/msm/msm_drv.h
> > >> +++ b/drivers/gpu/drm/msm/msm_drv.h
> > >> @@ -127,6 +127,11 @@ struct msm_display_info {
> > >> bool is_te_using_watchdog_timer;
> > >> };
> > >>
> > >> +struct msm_op_info {
> > >> + bool wide_bus_en;
> > >> + bool compression_en;
> > >> +};
> > >> +
> > >> /* Commit/Event thread specific structure */
> > >> struct msm_drm_thread {
> > >> struct drm_device *dev;
> > >> @@ -156,6 +161,8 @@ struct msm_drm_private {
> > >>
> > >> struct msm_dp *dp[MSM_DP_CONTROLLER_COUNT];
> > >>
> > >> + struct msm_op_info op_info[MSM_DP_CONTROLLER_COUNT];
> > >> +
> > > As I said before, it should be INTF_MAX. Or you can retrieve it from
> > > priv->dp as needed instead.
> > >
> > >> /* when we have more than one 'msm_gpu' these need to be an array: */
> > >> struct msm_gpu *gpu;
> > >>
> > >> @@ -338,6 +345,8 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi, struct drm_device *dev,
> > >> void __init msm_hdmi_register(void);
> > >> void __exit msm_hdmi_unregister(void);
> > >>
> > >> +struct msm_dp;
> > >> +
> > >> struct msm_dsi;
> > >> #ifdef CONFIG_DRM_MSM_DSI
> > >> int dsi_dev_attach(struct platform_device *pdev);
> > >> --
> > >> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > >> a Linux Foundation Collaborative Project
> > >>
> > >
>
>
>
> --
> With best wishes
> Dmitry
--
With best wishes
Dmitry
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