From f25c7a006cd1c07254780e3406e45cee4842b933 Mon Sep 17 00:00:00 2001 From: Manasi Navare Date: Wed, 13 Nov 2019 14:29:52 -0800 Subject: [PATCH] drm/fbdev: Fallback to non tiled mode if all tiles not present MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In case of tiled displays, if we hotplug just one connector, fbcon currently just selects the preferred mode and if it is tiled mode then that becomes a problem if rest of the tiles are not present. So in the fbdev driver on hotplug when we probe the client modeset, if we dont find all the connectors for all tiles, then on a connector with one tile, just fallback to the first available non tiled mode to display over a single connector. On the hotplug of the consecutive tiled connectors, if the tiled mode no longer exists because of fbcon size limitation, then return no modes for consecutive tiles but retain the non tiled mode on the 0th tile. Use the same logic in case of connected boot case as well. This has been tested with Dell UP328K tiled monitor. v2: * Set the modes on consecutive hotplugged tiles to no mode if tiled mode is pruned (Dave) v1: * Just handle the 1st connector hotplug case * v1 Reviewed-by: Dave Airlie Suggested-by: Ville Syrjälä Suggested-by: Dave Airlie Cc: Ville Syrjälä Cc: Dave Airlie Signed-off-by: Manasi Navare Reviewed-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/msgid/20191113222952.9231-1-manasi.d.navare@intel.com --- drivers/gpu/drm/drm_client_modeset.c | 70 ++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c index 895b73f23079..f2150a0bac4c 100644 --- a/drivers/gpu/drm/drm_client_modeset.c +++ b/drivers/gpu/drm/drm_client_modeset.c @@ -114,6 +114,33 @@ drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc) return NULL; } +static struct drm_display_mode * +drm_connector_get_tiled_mode(struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + list_for_each_entry(mode, &connector->modes, head) { + if (mode->hdisplay == connector->tile_h_size && + mode->vdisplay == connector->tile_v_size) + return mode; + } + return NULL; +} + +static struct drm_display_mode * +drm_connector_fallback_non_tiled_mode(struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + list_for_each_entry(mode, &connector->modes, head) { + if (mode->hdisplay == connector->tile_h_size && + mode->vdisplay == connector->tile_v_size) + continue; + return mode; + } + return NULL; +} + static struct drm_display_mode * drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height) { @@ -348,8 +375,14 @@ static bool drm_client_target_preferred(struct drm_connector **connectors, struct drm_connector *connector; u64 conn_configured = 0; int tile_pass = 0; + int num_tiled_conns = 0; int i; + for (i = 0; i < connector_count; i++) { + if (connectors[i]->has_tile) + num_tiled_conns++; + } + retry: for (i = 0; i < connector_count; i++) { connector = connectors[i]; @@ -399,6 +432,28 @@ retry: list_for_each_entry(modes[i], &connector->modes, head) break; } + /* + * In case of tiled mode if all tiles not present fallback to + * first available non tiled mode. + * After all tiles are present, try to find the tiled mode + * for all and if tiled mode not present due to fbcon size + * limitations, use first non tiled mode only for + * tile 0,0 and set to no mode for all other tiles. + */ + if (connector->has_tile) { + if (num_tiled_conns < + connector->num_h_tile * connector->num_v_tile || + (connector->tile_h_loc == 0 && + connector->tile_v_loc == 0 && + !drm_connector_get_tiled_mode(connector))) { + DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n", + connector->base.id); + modes[i] = drm_connector_fallback_non_tiled_mode(connector); + } else { + modes[i] = drm_connector_get_tiled_mode(connector); + } + } + DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : "none"); conn_configured |= BIT_ULL(i); @@ -515,6 +570,7 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, bool fallback = true, ret = true; int num_connectors_enabled = 0; int num_connectors_detected = 0; + int num_tiled_conns = 0; struct drm_modeset_acquire_ctx ctx; if (!drm_drv_uses_atomic_modeset(dev)) @@ -532,6 +588,10 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, memcpy(save_enabled, enabled, count); mask = GENMASK(count - 1, 0); conn_configured = 0; + for (i = 0; i < count; i++) { + if (connectors[i]->has_tile) + num_tiled_conns++; + } retry: conn_seq = conn_configured; for (i = 0; i < count; i++) { @@ -631,6 +691,16 @@ retry: connector->name); modes[i] = &connector->state->crtc->mode; } + /* + * In case of tiled modes, if all tiles are not present + * then fallback to a non tiled mode. + */ + if (connector->has_tile && + num_tiled_conns < connector->num_h_tile * connector->num_v_tile) { + DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n", + connector->base.id); + modes[i] = drm_connector_fallback_non_tiled_mode(connector); + } crtcs[i] = new_crtc; DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n", -- 2.30.2