diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/parade-ps8640.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/parade-ps8640.c | 127 |
1 files changed, 36 insertions, 91 deletions
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c index c3eb45179405..825777a5758f 100644 --- a/drivers/gpu/drm/bridge/parade-ps8640.c +++ b/drivers/gpu/drm/bridge/parade-ps8640.c @@ -20,7 +20,6 @@ #include <drm/drm_edid.h> #include <drm/drm_mipi_dsi.h> #include <drm/drm_of.h> -#include <drm/drm_panel.h> #include <drm/drm_print.h> #define PAGE0_AUXCH_CFG3 0x76 @@ -105,9 +104,9 @@ struct ps8640 { struct gpio_desc *gpio_reset; struct gpio_desc *gpio_powerdown; struct device_link *link; - struct edid *edid; bool pre_enabled; bool need_post_hpd_delay; + struct mutex aux_lock; }; static const struct regmap_config ps8640_regmap_config[] = { @@ -155,23 +154,6 @@ static inline struct ps8640 *aux_to_ps8640(struct drm_dp_aux *aux) return container_of(aux, struct ps8640, aux); } -static bool ps8640_of_panel_on_aux_bus(struct device *dev) -{ - struct device_node *bus, *panel; - - bus = of_get_child_by_name(dev->of_node, "aux-bus"); - if (!bus) - return false; - - panel = of_get_child_by_name(bus, "panel"); - of_node_put(bus); - if (!panel) - return false; - of_node_put(panel); - - return true; -} - static int _ps8640_wait_hpd_asserted(struct ps8640 *ps_bridge, unsigned long wait_us) { struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL]; @@ -228,7 +210,7 @@ static ssize_t ps8640_aux_transfer_msg(struct drm_dp_aux *aux, struct ps8640 *ps_bridge = aux_to_ps8640(aux); struct regmap *map = ps_bridge->regmap[PAGE0_DP_CNTL]; struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev; - unsigned int len = msg->size; + size_t len = msg->size; unsigned int data; unsigned int base; int ret; @@ -348,11 +330,12 @@ static ssize_t ps8640_aux_transfer_msg(struct drm_dp_aux *aux, return ret; } - buf[i] = data; + if (i < msg->size) + buf[i] = data; } } - return len; + return min(len, msg->size); } static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux, @@ -362,11 +345,20 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux, struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev; int ret; + mutex_lock(&ps_bridge->aux_lock); pm_runtime_get_sync(dev); + ret = _ps8640_wait_hpd_asserted(ps_bridge, 200 * 1000); + if (ret) { + pm_runtime_put_sync_suspend(dev); + goto exit; + } ret = ps8640_aux_transfer_msg(aux, msg); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); +exit: + mutex_unlock(&ps_bridge->aux_lock); + return ret; } @@ -445,7 +437,7 @@ static const struct dev_pm_ops ps8640_pm_ops = { }; static void ps8640_atomic_pre_enable(struct drm_bridge *bridge, - struct drm_bridge_state *old_bridge_state) + struct drm_atomic_state *state) { struct ps8640 *ps_bridge = bridge_to_ps8640(bridge); struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL]; @@ -480,17 +472,29 @@ static void ps8640_atomic_pre_enable(struct drm_bridge *bridge, } static void ps8640_atomic_post_disable(struct drm_bridge *bridge, - struct drm_bridge_state *old_bridge_state) + struct drm_atomic_state *state) { struct ps8640 *ps_bridge = bridge_to_ps8640(bridge); ps_bridge->pre_enabled = false; ps8640_bridge_vdo_control(ps_bridge, DISABLE); + + /* + * The bridge seems to expect everything to be power cycled at the + * disable process, so grab a lock here to make sure + * ps8640_aux_transfer() is not holding a runtime PM reference and + * preventing the bridge from suspend. + */ + mutex_lock(&ps_bridge->aux_lock); + pm_runtime_put_sync_suspend(&ps_bridge->page[PAGE0_DP_CNTL]->dev); + + mutex_unlock(&ps_bridge->aux_lock); } static int ps8640_bridge_attach(struct drm_bridge *bridge, + struct drm_encoder *encoder, enum drm_bridge_attach_flags flags) { struct ps8640 *ps_bridge = bridge_to_ps8640(bridge); @@ -515,7 +519,7 @@ static int ps8640_bridge_attach(struct drm_bridge *bridge, } /* Attach the panel-bridge to the dsi bridge */ - ret = drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge, + ret = drm_bridge_attach(encoder, ps_bridge->panel_bridge, &ps_bridge->bridge, flags); if (ret) goto err_bridge_attach; @@ -539,50 +543,6 @@ static void ps8640_bridge_detach(struct drm_bridge *bridge) device_link_del(ps_bridge->link); } -static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge, - struct drm_connector *connector) -{ - struct ps8640 *ps_bridge = bridge_to_ps8640(bridge); - struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev; - bool poweroff = !ps_bridge->pre_enabled; - - if (!ps_bridge->edid) { - /* - * When we end calling get_edid() triggered by an ioctl, i.e - * - * drm_mode_getconnector (ioctl) - * -> drm_helper_probe_single_connector_modes - * -> drm_bridge_connector_get_modes - * -> ps8640_bridge_get_edid - * - * We need to make sure that what we need is enabled before - * reading EDID, for this chip, we need to do a full poweron, - * otherwise it will fail. - */ - if (poweroff) - drm_atomic_bridge_chain_pre_enable(bridge, - connector->state->state); - - ps_bridge->edid = drm_get_edid(connector, - ps_bridge->page[PAGE0_DP_CNTL]->adapter); - - /* - * If we call the get_edid() function without having enabled the - * chip before, return the chip to its original power state. - */ - if (poweroff) - drm_atomic_bridge_chain_post_disable(bridge, - connector->state->state); - } - - if (!ps_bridge->edid) { - dev_err(dev, "Failed to get EDID\n"); - return NULL; - } - - return drm_edid_duplicate(ps_bridge->edid); -} - static void ps8640_runtime_disable(void *data) { pm_runtime_dont_use_autosuspend(data); @@ -592,7 +552,6 @@ static void ps8640_runtime_disable(void *data) static const struct drm_bridge_funcs ps8640_bridge_funcs = { .attach = ps8640_bridge_attach, .detach = ps8640_bridge_detach, - .get_edid = ps8640_bridge_get_edid, .atomic_post_disable = ps8640_atomic_post_disable, .atomic_pre_enable = ps8640_atomic_pre_enable, .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, @@ -677,9 +636,12 @@ static int ps8640_probe(struct i2c_client *client) int ret; u32 i; - ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL); - if (!ps_bridge) - return -ENOMEM; + ps_bridge = devm_drm_bridge_alloc(dev, struct ps8640, bridge, + &ps8640_bridge_funcs); + if (IS_ERR(ps_bridge)) + return PTR_ERR(ps_bridge); + + mutex_init(&ps_bridge->aux_lock); ps_bridge->supplies[0].supply = "vdd12"; ps_bridge->supplies[1].supply = "vdd33"; @@ -701,19 +663,10 @@ static int ps8640_probe(struct i2c_client *client) if (IS_ERR(ps_bridge->gpio_reset)) return PTR_ERR(ps_bridge->gpio_reset); - ps_bridge->bridge.funcs = &ps8640_bridge_funcs; ps_bridge->bridge.of_node = dev->of_node; ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP; /* - * In the device tree, if panel is listed under aux-bus of the bridge - * node, panel driver should be able to retrieve EDID by itself using - * aux-bus. So let's not set DRM_BRIDGE_OP_EDID here. - */ - if (!ps8640_of_panel_on_aux_bus(&client->dev)) - ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID; - - /* * Get MIPI DSI resources early. These can return -EPROBE_DEFER so * we want to get them out of the way sooner. */ @@ -777,13 +730,6 @@ static int ps8640_probe(struct i2c_client *client) return ret; } -static void ps8640_remove(struct i2c_client *client) -{ - struct ps8640 *ps_bridge = i2c_get_clientdata(client); - - kfree(ps_bridge->edid); -} - static const struct of_device_id ps8640_match[] = { { .compatible = "parade,ps8640" }, { } @@ -791,8 +737,7 @@ static const struct of_device_id ps8640_match[] = { MODULE_DEVICE_TABLE(of, ps8640_match); static struct i2c_driver ps8640_driver = { - .probe_new = ps8640_probe, - .remove = ps8640_remove, + .probe = ps8640_probe, .driver = { .name = "ps8640", .of_match_table = ps8640_match, |