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Message-ID: <kq6tb2wnte6v5z7uxgzc22kjwcevgvcdluzqbelvnbpbxlkotd@ltlv3u2guj4u>
Date: Mon, 9 Jun 2025 15:48:19 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
Abhinav Kumar <abhinav.kumar@...ux.dev>,
Jessica Zhang <jessica.zhang@....qualcomm.com>,
Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v2 02/38] drm/msm/dp: remove dp_display's dp_mode and use
dp_panel's instead
On Mon, Jun 09, 2025 at 08:21:21PM +0800, Yongxing Mou wrote:
> From: Abhinav Kumar <quic_abhinavk@...cinc.com>
>
> dp_display caches the current display mode and then passes it onto
> the panel to be used for programming the panel params. Remove this
> two level passing and directly populated the panel's dp_display_mode
> instead.
- Why do we need to cache / copy it anyway? Can't we just pass the
corresponding drm_atomic_state / drm_crtc_state / drm_display_mode ?
>
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
> ---
> drivers/gpu/drm/msm/dp/dp_display.c | 76 ++++++++++++++-----------------------
> 1 file changed, 29 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 4a9b65647cdef1ed6c3bb851f93df0db8be977af..9d2db9cbd2552470a36a63f70f517c35436f7280 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -92,7 +92,6 @@ struct msm_dp_display_private {
> struct msm_dp_panel *panel;
> struct msm_dp_ctrl *ctrl;
>
> - struct msm_dp_display_mode msm_dp_mode;
> struct msm_dp msm_dp_display;
>
> /* wait for audio signaling */
> @@ -806,16 +805,29 @@ static int msm_dp_init_sub_modules(struct msm_dp_display_private *dp)
> }
>
> static int msm_dp_display_set_mode(struct msm_dp *msm_dp_display,
> - struct msm_dp_display_mode *mode)
> + const struct drm_display_mode *adjusted_mode,
> + struct msm_dp_panel *msm_dp_panel)
> {
> - struct msm_dp_display_private *dp;
> + u32 bpp;
>
> - dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
> + drm_mode_copy(&msm_dp_panel->msm_dp_mode.drm_mode, adjusted_mode);
> +
> + if (msm_dp_display_check_video_test(msm_dp_display))
> + bpp = msm_dp_display_get_test_bpp(msm_dp_display);
> + else
> + bpp = msm_dp_panel->connector->display_info.bpc * 3;
> +
> + msm_dp_panel->msm_dp_mode.bpp = bpp;
> +
> + msm_dp_panel->msm_dp_mode.v_active_low =
> + !!(adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC);
> + msm_dp_panel->msm_dp_mode.h_active_low =
> + !!(adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC);
> + msm_dp_panel->msm_dp_mode.out_fmt_is_yuv_420 =
> + drm_mode_is_420_only(&msm_dp_panel->connector->display_info, adjusted_mode) &&
> + msm_dp_panel->vsc_sdp_supported;
>
> - drm_mode_copy(&dp->panel->msm_dp_mode.drm_mode, &mode->drm_mode);
> - dp->panel->msm_dp_mode.bpp = mode->bpp;
> - dp->panel->msm_dp_mode.out_fmt_is_yuv_420 = mode->out_fmt_is_yuv_420;
> - msm_dp_panel_init_panel_info(dp->panel);
> + msm_dp_panel_init_panel_info(msm_dp_panel);
> return 0;
> }
>
> @@ -1431,10 +1443,13 @@ bool msm_dp_needs_periph_flush(const struct msm_dp *msm_dp_display,
> bool msm_dp_wide_bus_available(const struct msm_dp *msm_dp_display)
> {
> struct msm_dp_display_private *dp;
> + struct msm_dp_panel *dp_panel;
>
> dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
>
> - if (dp->msm_dp_mode.out_fmt_is_yuv_420)
> + dp_panel = dp->panel;
> +
> + if (dp_panel->msm_dp_mode.out_fmt_is_yuv_420)
> return false;
>
> return dp->wide_bus_supported;
> @@ -1496,10 +1511,6 @@ void msm_dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> bool force_link_train = false;
>
> msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
> - if (!msm_dp_display->msm_dp_mode.drm_mode.clock) {
> - DRM_ERROR("invalid params\n");
> - return;
> - }
>
> if (dp->is_edp)
> msm_dp_hpd_plug_handle(msm_dp_display, 0);
> @@ -1517,15 +1528,6 @@ void msm_dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
> return;
> }
>
> - rc = msm_dp_display_set_mode(dp, &msm_dp_display->msm_dp_mode);
> - if (rc) {
> - DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
> - mutex_unlock(&msm_dp_display->event_mutex);
> - return;
> - }
It should be done other way around: keep this call and drop
msm_dp_bridge_mode_set().
> -
> - hpd_state = msm_dp_display->hpd_state;
> -
> if (hpd_state == ST_CONNECTED && !dp->power_on) {
> msm_dp_display_host_phy_init(msm_dp_display);
> force_link_train = true;
> @@ -1604,33 +1606,13 @@ void msm_dp_bridge_mode_set(struct drm_bridge *drm_bridge,
> msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
> msm_dp_panel = msm_dp_display->panel;
>
> - memset(&msm_dp_display->msm_dp_mode, 0x0, sizeof(struct msm_dp_display_mode));
> -
> - if (msm_dp_display_check_video_test(dp))
> - msm_dp_display->msm_dp_mode.bpp = msm_dp_display_get_test_bpp(dp);
> - else /* Default num_components per pixel = 3 */
> - msm_dp_display->msm_dp_mode.bpp = dp->connector->display_info.bpc * 3;
> -
> - if (!msm_dp_display->msm_dp_mode.bpp)
> - msm_dp_display->msm_dp_mode.bpp = 24; /* Default bpp */
> -
> - drm_mode_copy(&msm_dp_display->msm_dp_mode.drm_mode, adjusted_mode);
> -
> - msm_dp_display->msm_dp_mode.v_active_low =
> - !!(msm_dp_display->msm_dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
> -
> - msm_dp_display->msm_dp_mode.h_active_low =
> - !!(msm_dp_display->msm_dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
> -
> - msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 =
> - drm_mode_is_420_only(&dp->connector->display_info, adjusted_mode) &&
> - msm_dp_panel->vsc_sdp_supported;
> + msm_dp_display_set_mode(dp, adjusted_mode, msm_dp_panel);
>
> /* populate wide_bus_support to different layers */
> - msm_dp_display->ctrl->wide_bus_en =
> - msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 ? false : msm_dp_display->wide_bus_supported;
> - msm_dp_display->catalog->wide_bus_en =
> - msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 ? false : msm_dp_display->wide_bus_supported;
> + msm_dp_display->ctrl->wide_bus_en = msm_dp_panel->msm_dp_mode.out_fmt_is_yuv_420 ?
> + false : msm_dp_display->wide_bus_supported;
> + msm_dp_display->catalog->wide_bus_en = msm_dp_panel->msm_dp_mode.out_fmt_is_yuv_420 ?
> + false : msm_dp_display->wide_bus_supported;
> }
>
> void msm_dp_bridge_hpd_enable(struct drm_bridge *bridge)
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
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