[Freedreno] [[RFC]DPU PATCH] drm/msm/dsi: Use one connector for dual DSI mode
Sean Paul
seanpaul at chromium.org
Thu Mar 1 15:53:21 UTC 2018
On Wed, Feb 28, 2018 at 04:44:49PM -0800, Chandan Uddaraju wrote:
> Current DSI driver uses two connectors for dual DSI case even
> though we only have one panel. Fix this by implementing one
> connector/bridge for dual DSI use case.
>
> Current patch is not yet tested on dual-dsi setup.
This seems like something that might benefit from being part of a patch series
that can be tested end-to-end (ie: a patch series to add full dual-dsi support
to the dsi driver). It's kind of hard to see where things are going with just
this one small piece.
>
> Signed-off-by: Chandan Uddaraju <chandanu at codeaurora.org>
> ---
> drivers/gpu/drm/msm/dsi/dsi.c | 3 +
> drivers/gpu/drm/msm/dsi/dsi.h | 1 +
> drivers/gpu/drm/msm/dsi/dsi_manager.c | 100 +++++++---------------------------
> 3 files changed, 24 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
> index b744bcc..ff8164c 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi.c
> @@ -208,6 +208,9 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
> goto fail;
> }
>
> + if (!msm_dsi_manager_validate_current_config(msm_dsi->id))
> + goto fail;
> +
> msm_dsi->encoder = encoder;
>
> msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 70d9a9a..2d9763f 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -100,6 +100,7 @@ struct msm_dsi {
> void msm_dsi_manager_attach_dsi_device(int id, u32 device_flags);
> int msm_dsi_manager_register(struct msm_dsi *msm_dsi);
> void msm_dsi_manager_unregister(struct msm_dsi *msm_dsi);
> +bool msm_dsi_manager_validate_current_config(u8 id);
>
> /* msm dsi */
> static inline bool msm_dsi_device_connected(struct msm_dsi *msm_dsi)
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> index 4cb1cb6..bf92f25 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -305,67 +305,6 @@ static void dsi_mgr_connector_destroy(struct drm_connector *connector)
> kfree(dsi_connector);
> }
>
> -static void dsi_dual_connector_fix_modes(struct drm_connector *connector)
> -{
> - struct drm_display_mode *mode, *m;
> -
> - /* Only support left-right mode */
> - list_for_each_entry_safe(mode, m, &connector->probed_modes, head) {
> - mode->clock >>= 1;
> - mode->hdisplay >>= 1;
> - mode->hsync_start >>= 1;
> - mode->hsync_end >>= 1;
> - mode->htotal >>= 1;
> - drm_mode_set_name(mode);
> - }
> -}
> -
> -static int dsi_dual_connector_tile_init(
> - struct drm_connector *connector, int id)
> -{
> - struct drm_display_mode *mode;
> - /* Fake topology id */
> - char topo_id[8] = {'M', 'S', 'M', 'D', 'U', 'D', 'S', 'I'};
> -
> - if (connector->tile_group) {
> - DBG("Tile property has been initialized");
> - return 0;
> - }
> -
> - /* Use the first mode only for now */
> - mode = list_first_entry(&connector->probed_modes,
> - struct drm_display_mode,
> - head);
> - if (!mode)
> - return -EINVAL;
> -
> - connector->tile_group = drm_mode_get_tile_group(
> - connector->dev, topo_id);
> - if (!connector->tile_group)
> - connector->tile_group = drm_mode_create_tile_group(
> - connector->dev, topo_id);
> - if (!connector->tile_group) {
> - pr_err("%s: failed to create tile group\n", __func__);
> - return -ENOMEM;
> - }
> -
> - connector->has_tile = true;
> - connector->tile_is_single_monitor = true;
> -
> - /* mode has been fixed */
> - connector->tile_h_size = mode->hdisplay;
> - connector->tile_v_size = mode->vdisplay;
> -
> - /* Only support left-right mode */
> - connector->num_h_tile = 2;
> - connector->num_v_tile = 1;
> -
> - connector->tile_v_loc = 0;
> - connector->tile_h_loc = (id == DSI_RIGHT) ? 1 : 0;
> -
> - return 0;
> -}
> -
> static int dsi_mgr_connector_get_modes(struct drm_connector *connector)
> {
> int id = dsi_mgr_connector_get_id(connector);
> @@ -376,31 +315,15 @@ static int dsi_mgr_connector_get_modes(struct drm_connector *connector)
> if (!panel)
> return 0;
>
> - /* Since we have 2 connectors, but only 1 drm_panel in dual DSI mode,
> - * panel should not attach to any connector.
> - * Only temporarily attach panel to the current connector here,
> - * to let panel set mode to this connector.
> + /*
> + * In dual DSI mode, we have one connector that can be
> + * attached to the drm_panel.
> */
> drm_panel_attach(panel, connector);
> num = drm_panel_get_modes(panel);
> - drm_panel_detach(panel);
> if (!num)
> return 0;
>
> - if (IS_DUAL_DSI()) {
> - /* report half resolution to user */
> - dsi_dual_connector_fix_modes(connector);
> - ret = dsi_dual_connector_tile_init(connector, id);
> - if (ret)
> - return ret;
> - ret = drm_mode_connector_set_tile_property(connector);
> - if (ret) {
> - pr_err("%s: set tile property failed, %d\n",
> - __func__, ret);
> - return ret;
> - }
> - }
> -
> return num;
> }
>
> @@ -689,6 +612,23 @@ struct drm_connector *msm_dsi_manager_connector_init(u8 id)
> return connector;
> }
>
> +bool msm_dsi_manager_validate_current_config(u8 id)
> +{
> + bool is_dual_dsi = IS_DUAL_DSI();
> +
> + /*
> + * For dual DSI, we only have one drm panel. For this
> + * use case, we register only one bridge/connector.
> + * Skip bridge/connector initialisation if it is
> + * DSI 1 in case of dual DSI.
I think the other dual-dsi implementations take the master/slave cues from
device tree as opposed to hard-coding one or the other (I know of at least one
case where DSI_1 was connected to the panel's first channel, whereas DSI_0 was
connected to the second channel.
Sean
> + */
> + if (is_dual_dsi && (DSI_1 == id)) {
> + DBG("Skip DSI_1 bridge registration for dual DSI.\n");
> + return false;
> + }
> + return true;
> +}
> +
> /* initialize bridge */
> struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
> {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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