diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/ti-sn65dsi86.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/ti-sn65dsi86.c | 760 |
1 files changed, 414 insertions, 346 deletions
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 45a2969afb2b..41d48a393e7f 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -23,6 +23,7 @@ #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> +#include <drm/drm_dp_aux_bus.h> #include <drm/drm_dp_helper.h> #include <drm/drm_mipi_dsi.h> #include <drm/drm_of.h> @@ -116,6 +117,7 @@ * struct ti_sn65dsi86 - Platform data for ti-sn65dsi86 driver. * @bridge_aux: AUX-bus sub device for MIPI-to-eDP bridge functionality. * @gpio_aux: AUX-bus sub device for GPIO controller functionality. + * @aux_aux: AUX-bus sub device for eDP AUX channel functionality. * * @dev: Pointer to the top level (i2c) device. * @regmap: Regmap for accessing i2c. @@ -124,9 +126,8 @@ * @connector: Our connector. * @host_node: Remote DSI node. * @dsi: Our MIPI DSI source. - * @edid: Detected EDID of eDP panel. * @refclk: Our reference clock. - * @panel: Our panel. + * @next_bridge: The bridge on the eDP side. * @enable_gpio: The GPIO we toggle to enable the bridge. * @supplies: Data for bulk enabling/disabling our regulators. * @dp_lanes: Count of dp_lanes we're using. @@ -148,17 +149,17 @@ struct ti_sn65dsi86 { struct auxiliary_device bridge_aux; struct auxiliary_device gpio_aux; + struct auxiliary_device aux_aux; struct device *dev; struct regmap *regmap; struct drm_dp_aux aux; struct drm_bridge bridge; struct drm_connector connector; - struct edid *edid; struct device_node *host_node; struct mipi_dsi_device *dsi; struct clk *refclk; - struct drm_panel *panel; + struct drm_bridge *next_bridge; struct gpio_desc *enable_gpio; struct regulator_bulk_data supplies[SN_REGULATOR_SUPPLY_NUM]; int dp_lanes; @@ -306,6 +307,9 @@ static int __maybe_unused ti_sn65dsi86_resume(struct device *dev) return ret; } + /* td2: min 100 us after regulators before enabling the GPIO */ + usleep_range(100, 110); + gpiod_set_value(pdata->enable_gpio, 1); /* @@ -393,35 +397,222 @@ static void ti_sn65dsi86_debugfs_init(struct ti_sn65dsi86 *pdata) debugfs_create_file("status", 0600, debugfs, pdata, &status_fops); } -/* Connector funcs */ -static struct ti_sn65dsi86 * -connector_to_ti_sn65dsi86(struct drm_connector *connector) +/* ----------------------------------------------------------------------------- + * Auxiliary Devices (*not* AUX) + */ + +static void ti_sn65dsi86_uninit_aux(void *data) { - return container_of(connector, struct ti_sn65dsi86, connector); + auxiliary_device_uninit(data); } -static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector) +static void ti_sn65dsi86_delete_aux(void *data) { - struct ti_sn65dsi86 *pdata = connector_to_ti_sn65dsi86(connector); - struct edid *edid = pdata->edid; - int num, ret; + auxiliary_device_delete(data); +} - if (!edid) { - pm_runtime_get_sync(pdata->dev); - edid = pdata->edid = drm_get_edid(connector, &pdata->aux.ddc); - pm_runtime_put_autosuspend(pdata->dev); +/* + * AUX bus docs say that a non-NULL release is mandatory, but it makes no + * sense for the model used here where all of the aux devices are allocated + * in the single shared structure. We'll use this noop as a workaround. + */ +static void ti_sn65dsi86_noop(struct device *dev) {} + +static int ti_sn65dsi86_add_aux_device(struct ti_sn65dsi86 *pdata, + struct auxiliary_device *aux, + const char *name) +{ + struct device *dev = pdata->dev; + int ret; + + aux->name = name; + aux->dev.parent = dev; + aux->dev.release = ti_sn65dsi86_noop; + device_set_of_node_from_dev(&aux->dev, dev); + ret = auxiliary_device_init(aux); + if (ret) + return ret; + ret = devm_add_action_or_reset(dev, ti_sn65dsi86_uninit_aux, aux); + if (ret) + return ret; + + ret = auxiliary_device_add(aux); + if (ret) + return ret; + ret = devm_add_action_or_reset(dev, ti_sn65dsi86_delete_aux, aux); + + return ret; +} + +/* ----------------------------------------------------------------------------- + * AUX Adapter + */ + +static struct ti_sn65dsi86 *aux_to_ti_sn65dsi86(struct drm_dp_aux *aux) +{ + return container_of(aux, struct ti_sn65dsi86, aux); +} + +static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct ti_sn65dsi86 *pdata = aux_to_ti_sn65dsi86(aux); + u32 request = msg->request & ~(DP_AUX_I2C_MOT | DP_AUX_I2C_WRITE_STATUS_UPDATE); + u32 request_val = AUX_CMD_REQ(msg->request); + u8 *buf = msg->buffer; + unsigned int len = msg->size; + unsigned int val; + int ret; + u8 addr_len[SN_AUX_LENGTH_REG + 1 - SN_AUX_ADDR_19_16_REG]; + + if (len > SN_AUX_MAX_PAYLOAD_BYTES) + return -EINVAL; + + pm_runtime_get_sync(pdata->dev); + mutex_lock(&pdata->comms_mutex); + + /* + * If someone tries to do a DDC over AUX transaction before pre_enable() + * on a device without a dedicated reference clock then we just can't + * do it. Fail right away. This prevents non-refclk users from reading + * the EDID before enabling the panel but such is life. + */ + if (!pdata->comms_enabled) { + ret = -EIO; + goto exit; + } + + switch (request) { + case DP_AUX_NATIVE_WRITE: + case DP_AUX_I2C_WRITE: + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ: + regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val); + /* Assume it's good */ + msg->reply = 0; + break; + default: + ret = -EINVAL; + goto exit; + } + + BUILD_BUG_ON(sizeof(addr_len) != sizeof(__be32)); + put_unaligned_be32((msg->address & SN_AUX_ADDR_MASK) << 8 | len, + addr_len); + regmap_bulk_write(pdata->regmap, SN_AUX_ADDR_19_16_REG, addr_len, + ARRAY_SIZE(addr_len)); + + if (request == DP_AUX_NATIVE_WRITE || request == DP_AUX_I2C_WRITE) + regmap_bulk_write(pdata->regmap, SN_AUX_WDATA_REG(0), buf, len); + + /* Clear old status bits before start so we don't get confused */ + regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG, + AUX_IRQ_STATUS_NAT_I2C_FAIL | + AUX_IRQ_STATUS_AUX_RPLY_TOUT | + AUX_IRQ_STATUS_AUX_SHORT); + + regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND); + + /* Zero delay loop because i2c transactions are slow already */ + ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val, + !(val & AUX_CMD_SEND), 0, 50 * 1000); + if (ret) + goto exit; + + ret = regmap_read(pdata->regmap, SN_AUX_CMD_STATUS_REG, &val); + if (ret) + goto exit; + + if (val & AUX_IRQ_STATUS_AUX_RPLY_TOUT) { + /* + * The hardware tried the message seven times per the DP spec + * but it hit a timeout. We ignore defers here because they're + * handled in hardware. + */ + ret = -ETIMEDOUT; + goto exit; } - if (edid && drm_edid_is_valid(edid)) { - ret = drm_connector_update_edid_property(connector, edid); - if (!ret) { - num = drm_add_edid_modes(connector, edid); - if (num) - return num; + if (val & AUX_IRQ_STATUS_AUX_SHORT) { + ret = regmap_read(pdata->regmap, SN_AUX_LENGTH_REG, &len); + if (ret) + goto exit; + } else if (val & AUX_IRQ_STATUS_NAT_I2C_FAIL) { + switch (request) { + case DP_AUX_I2C_WRITE: + case DP_AUX_I2C_READ: + msg->reply |= DP_AUX_I2C_REPLY_NACK; + break; + case DP_AUX_NATIVE_READ: + case DP_AUX_NATIVE_WRITE: + msg->reply |= DP_AUX_NATIVE_REPLY_NACK; + break; } + len = 0; + goto exit; } - return drm_panel_get_modes(pdata->panel, connector); + if (request != DP_AUX_NATIVE_WRITE && request != DP_AUX_I2C_WRITE && len != 0) + ret = regmap_bulk_read(pdata->regmap, SN_AUX_RDATA_REG(0), buf, len); + +exit: + mutex_unlock(&pdata->comms_mutex); + pm_runtime_mark_last_busy(pdata->dev); + pm_runtime_put_autosuspend(pdata->dev); + + if (ret) + return ret; + return len; +} + +static int ti_sn_aux_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); + int ret; + + pdata->aux.name = "ti-sn65dsi86-aux"; + pdata->aux.dev = &adev->dev; + pdata->aux.transfer = ti_sn_aux_transfer; + drm_dp_aux_init(&pdata->aux); + + ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux); + if (ret) + return ret; + + /* + * The eDP to MIPI bridge parts don't work until the AUX channel is + * setup so we don't add it in the main driver probe, we add it now. + */ + return ti_sn65dsi86_add_aux_device(pdata, &pdata->bridge_aux, "bridge"); +} + +static const struct auxiliary_device_id ti_sn_aux_id_table[] = { + { .name = "ti_sn65dsi86.aux", }, + {}, +}; + +static struct auxiliary_driver ti_sn_aux_driver = { + .name = "aux", + .probe = ti_sn_aux_probe, + .id_table = ti_sn_aux_id_table, +}; + +/* ----------------------------------------------------------------------------- + * DRM Connector Operations + */ + +static struct ti_sn65dsi86 * +connector_to_ti_sn65dsi86(struct drm_connector *connector) +{ + return container_of(connector, struct ti_sn65dsi86, connector); +} + +static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector) +{ + struct ti_sn65dsi86 *pdata = connector_to_ti_sn65dsi86(connector); + + return drm_bridge_get_modes(pdata->next_bridge, connector); } static enum drm_mode_status @@ -448,23 +639,32 @@ static const struct drm_connector_funcs ti_sn_bridge_connector_funcs = { .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; -static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge) +static int ti_sn_bridge_connector_init(struct ti_sn65dsi86 *pdata) { - return container_of(bridge, struct ti_sn65dsi86, bridge); -} + int ret; -static int ti_sn65dsi86_parse_regulators(struct ti_sn65dsi86 *pdata) -{ - unsigned int i; - const char * const ti_sn_bridge_supply_names[] = { - "vcca", "vcc", "vccio", "vpll", - }; + ret = drm_connector_init(pdata->bridge.dev, &pdata->connector, + &ti_sn_bridge_connector_funcs, + DRM_MODE_CONNECTOR_eDP); + if (ret) { + DRM_ERROR("Failed to initialize connector with drm\n"); + return ret; + } - for (i = 0; i < SN_REGULATOR_SUPPLY_NUM; i++) - pdata->supplies[i].supply = ti_sn_bridge_supply_names[i]; + drm_connector_helper_add(&pdata->connector, + &ti_sn_bridge_connector_helper_funcs); + drm_connector_attach_encoder(&pdata->connector, pdata->bridge.encoder); - return devm_regulator_bulk_get(pdata->dev, SN_REGULATOR_SUPPLY_NUM, - pdata->supplies); + return 0; +} + +/*------------------------------------------------------------------------------ + * DRM Bridge + */ + +static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge) +{ + return container_of(bridge, struct ti_sn65dsi86, bridge); } static int ti_sn_bridge_attach(struct drm_bridge *bridge, @@ -491,17 +691,9 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, return ret; } - ret = drm_connector_init(bridge->dev, &pdata->connector, - &ti_sn_bridge_connector_funcs, - DRM_MODE_CONNECTOR_eDP); - if (ret) { - DRM_ERROR("Failed to initialize connector with drm\n"); + ret = ti_sn_bridge_connector_init(pdata); + if (ret < 0) goto err_conn_init; - } - - drm_connector_helper_add(&pdata->connector, - &ti_sn_bridge_connector_helper_funcs); - drm_connector_attach_encoder(&pdata->connector, bridge->encoder); /* * TODO: ideally finding host resource and dsi dev registration needs @@ -547,8 +739,19 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, } pdata->dsi = dsi; + /* We never want the next bridge to *also* create a connector: */ + flags |= DRM_BRIDGE_ATTACH_NO_CONNECTOR; + + /* Attach the next bridge */ + ret = drm_bridge_attach(bridge->encoder, pdata->next_bridge, + &pdata->bridge, flags); + if (ret < 0) + goto err_dsi_detach; + return 0; +err_dsi_detach: + mipi_dsi_detach(dsi); err_dsi_attach: mipi_dsi_device_unregister(dsi); err_dsi_host: @@ -567,14 +770,8 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge) { struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge); - drm_panel_disable(pdata->panel); - /* disable video stream */ regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, 0); - /* semi auto link training mode OFF */ - regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0); - /* disable DP PLL */ - regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0); } static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata) @@ -633,9 +830,9 @@ static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn65dsi86 *pdata) return i; } -static void ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata, - bool rate_valid[]) +static unsigned int ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata) { + unsigned int valid_rates = 0; unsigned int rate_per_200khz; unsigned int rate_mhz; u8 dpcd_val; @@ -675,13 +872,13 @@ static void ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata, j < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); j++) { if (ti_sn_bridge_dp_rate_lut[j] == rate_mhz) - rate_valid[j] = true; + valid_rates |= BIT(j); } } for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); i++) { - if (rate_valid[i]) - return; + if (valid_rates & BIT(i)) + return valid_rates; } DRM_DEV_ERROR(pdata->dev, "No matching eDP rates in table; falling back\n"); @@ -703,15 +900,17 @@ static void ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata, (int)dpcd_val); fallthrough; case DP_LINK_BW_5_4: - rate_valid[7] = 1; + valid_rates |= BIT(7); fallthrough; case DP_LINK_BW_2_7: - rate_valid[4] = 1; + valid_rates |= BIT(4); fallthrough; case DP_LINK_BW_1_62: - rate_valid[1] = 1; + valid_rates |= BIT(1); break; } + + return valid_rates; } static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata) @@ -829,8 +1028,8 @@ exit: static void ti_sn_bridge_enable(struct drm_bridge *bridge) { struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge); - bool rate_valid[ARRAY_SIZE(ti_sn_bridge_dp_rate_lut)] = { }; const char *last_err_str = "No supported DP rate"; + unsigned int valid_rates; int dp_rate_idx; unsigned int val; int ret = -EINVAL; @@ -869,13 +1068,13 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG, DP_NUM_LANES_MASK, val); - ti_sn_bridge_read_valid_rates(pdata, rate_valid); + valid_rates = ti_sn_bridge_read_valid_rates(pdata); /* Train until we run out of rates */ for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata); dp_rate_idx < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); dp_rate_idx++) { - if (!rate_valid[dp_rate_idx]) + if (!(valid_rates & BIT(dp_rate_idx))) continue; ret = ti_sn_link_training(pdata, dp_rate_idx, &last_err_str); @@ -893,8 +1092,6 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) /* enable video stream */ regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, VSTREAM_ENABLE); - - drm_panel_enable(pdata->panel); } static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) @@ -906,14 +1103,20 @@ static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) if (!pdata->refclk) ti_sn65dsi86_enable_comms(pdata); - drm_panel_prepare(pdata->panel); + /* td7: min 100 us after enable before DSI data */ + usleep_range(100, 110); } static void ti_sn_bridge_post_disable(struct drm_bridge *bridge) { struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge); - drm_panel_unprepare(pdata->panel); + /* semi auto link training mode OFF */ + regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0); + /* Num lanes to 0 as per power sequencing in data sheet */ + regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG, DP_NUM_LANES_MASK, 0); + /* disable DP PLL */ + regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0); if (!pdata->refclk) ti_sn65dsi86_disable_comms(pdata); @@ -930,137 +1133,135 @@ static const struct drm_bridge_funcs ti_sn_bridge_funcs = { .post_disable = ti_sn_bridge_post_disable, }; -static struct ti_sn65dsi86 *aux_to_ti_sn65dsi86(struct drm_dp_aux *aux) -{ - return container_of(aux, struct ti_sn65dsi86, aux); -} - -static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, - struct drm_dp_aux_msg *msg) +static void ti_sn_bridge_parse_lanes(struct ti_sn65dsi86 *pdata, + struct device_node *np) { - struct ti_sn65dsi86 *pdata = aux_to_ti_sn65dsi86(aux); - u32 request = msg->request & ~(DP_AUX_I2C_MOT | DP_AUX_I2C_WRITE_STATUS_UPDATE); - u32 request_val = AUX_CMD_REQ(msg->request); - u8 *buf = msg->buffer; - unsigned int len = msg->size; - unsigned int val; - int ret; - u8 addr_len[SN_AUX_LENGTH_REG + 1 - SN_AUX_ADDR_19_16_REG]; - - if (len > SN_AUX_MAX_PAYLOAD_BYTES) - return -EINVAL; - - pm_runtime_get_sync(pdata->dev); - mutex_lock(&pdata->comms_mutex); + u32 lane_assignments[SN_MAX_DP_LANES] = { 0, 1, 2, 3 }; + u32 lane_polarities[SN_MAX_DP_LANES] = { }; + struct device_node *endpoint; + u8 ln_assign = 0; + u8 ln_polrs = 0; + int dp_lanes; + int i; /* - * If someone tries to do a DDC over AUX transaction before pre_enable() - * on a device without a dedicated reference clock then we just can't - * do it. Fail right away. This prevents non-refclk users from reading - * the EDID before enabling the panel but such is life. + * Read config from the device tree about lane remapping and lane + * polarities. These are optional and we assume identity map and + * normal polarity if nothing is specified. It's OK to specify just + * data-lanes but not lane-polarities but not vice versa. + * + * Error checking is light (we just make sure we don't crash or + * buffer overrun) and we assume dts is well formed and specifying + * mappings that the hardware supports. */ - if (!pdata->comms_enabled) { - ret = -EIO; - goto exit; + endpoint = of_graph_get_endpoint_by_regs(np, 1, -1); + dp_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); + if (dp_lanes > 0 && dp_lanes <= SN_MAX_DP_LANES) { + of_property_read_u32_array(endpoint, "data-lanes", + lane_assignments, dp_lanes); + of_property_read_u32_array(endpoint, "lane-polarities", + lane_polarities, dp_lanes); + } else { + dp_lanes = SN_MAX_DP_LANES; } + of_node_put(endpoint); - switch (request) { - case DP_AUX_NATIVE_WRITE: - case DP_AUX_I2C_WRITE: - case DP_AUX_NATIVE_READ: - case DP_AUX_I2C_READ: - regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val); - /* Assume it's good */ - msg->reply = 0; - break; - default: - ret = -EINVAL; - goto exit; + /* + * Convert into register format. Loop over all lanes even if + * data-lanes had fewer elements so that we nicely initialize + * the LN_ASSIGN register. + */ + for (i = SN_MAX_DP_LANES - 1; i >= 0; i--) { + ln_assign = ln_assign << LN_ASSIGN_WIDTH | lane_assignments[i]; + ln_polrs = ln_polrs << 1 | lane_polarities[i]; } - BUILD_BUG_ON(sizeof(addr_len) != sizeof(__be32)); - put_unaligned_be32((msg->address & SN_AUX_ADDR_MASK) << 8 | len, - addr_len); - regmap_bulk_write(pdata->regmap, SN_AUX_ADDR_19_16_REG, addr_len, - ARRAY_SIZE(addr_len)); + /* Stash in our struct for when we power on */ + pdata->dp_lanes = dp_lanes; + pdata->ln_assign = ln_assign; + pdata->ln_polrs = ln_polrs; +} - if (request == DP_AUX_NATIVE_WRITE || request == DP_AUX_I2C_WRITE) - regmap_bulk_write(pdata->regmap, SN_AUX_WDATA_REG(0), buf, len); +static int ti_sn_bridge_parse_dsi_host(struct ti_sn65dsi86 *pdata) +{ + struct device_node *np = pdata->dev->of_node; - /* Clear old status bits before start so we don't get confused */ - regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG, - AUX_IRQ_STATUS_NAT_I2C_FAIL | - AUX_IRQ_STATUS_AUX_RPLY_TOUT | - AUX_IRQ_STATUS_AUX_SHORT); + pdata->host_node = of_graph_get_remote_node(np, 0, 0); - regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND); + if (!pdata->host_node) { + DRM_ERROR("remote dsi host node not found\n"); + return -ENODEV; + } - /* Zero delay loop because i2c transactions are slow already */ - ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val, - !(val & AUX_CMD_SEND), 0, 50 * 1000); - if (ret) - goto exit; + return 0; +} - ret = regmap_read(pdata->regmap, SN_AUX_CMD_STATUS_REG, &val); - if (ret) - goto exit; +static int ti_sn_bridge_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); + struct device_node *np = pdata->dev->of_node; + struct drm_panel *panel; + int ret; - if (val & AUX_IRQ_STATUS_AUX_RPLY_TOUT) { - /* - * The hardware tried the message seven times per the DP spec - * but it hit a timeout. We ignore defers here because they're - * handled in hardware. - */ - ret = -ETIMEDOUT; - goto exit; - } + ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL); + if (ret) + return dev_err_probe(&adev->dev, ret, + "could not find any panel node\n"); - if (val & AUX_IRQ_STATUS_AUX_SHORT) { - ret = regmap_read(pdata->regmap, SN_AUX_LENGTH_REG, &len); - if (ret) - goto exit; - } else if (val & AUX_IRQ_STATUS_NAT_I2C_FAIL) { - switch (request) { - case DP_AUX_I2C_WRITE: - case DP_AUX_I2C_READ: - msg->reply |= DP_AUX_I2C_REPLY_NACK; - break; - case DP_AUX_NATIVE_READ: - case DP_AUX_NATIVE_WRITE: - msg->reply |= DP_AUX_NATIVE_REPLY_NACK; - break; - } - len = 0; - goto exit; + pdata->next_bridge = devm_drm_panel_bridge_add(pdata->dev, panel); + if (IS_ERR(pdata->next_bridge)) { + DRM_ERROR("failed to create panel bridge\n"); + return PTR_ERR(pdata->next_bridge); } - if (request != DP_AUX_NATIVE_WRITE && request != DP_AUX_I2C_WRITE && len != 0) - ret = regmap_bulk_read(pdata->regmap, SN_AUX_RDATA_REG(0), buf, len); - -exit: - mutex_unlock(&pdata->comms_mutex); - pm_runtime_mark_last_busy(pdata->dev); - pm_runtime_put_autosuspend(pdata->dev); + ti_sn_bridge_parse_lanes(pdata, np); + ret = ti_sn_bridge_parse_dsi_host(pdata); if (ret) return ret; - return len; + + pdata->bridge.funcs = &ti_sn_bridge_funcs; + pdata->bridge.of_node = np; + + drm_bridge_add(&pdata->bridge); + + return 0; } -static int ti_sn_bridge_parse_dsi_host(struct ti_sn65dsi86 *pdata) +static void ti_sn_bridge_remove(struct auxiliary_device *adev) { - struct device_node *np = pdata->dev->of_node; + struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); - pdata->host_node = of_graph_get_remote_node(np, 0, 0); + if (!pdata) + return; - if (!pdata->host_node) { - DRM_ERROR("remote dsi host node not found\n"); - return -ENODEV; + if (pdata->dsi) { + mipi_dsi_detach(pdata->dsi); + mipi_dsi_device_unregister(pdata->dsi); } - return 0; + drm_bridge_remove(&pdata->bridge); + + of_node_put(pdata->host_node); } +static const struct auxiliary_device_id ti_sn_bridge_id_table[] = { + { .name = "ti_sn65dsi86.bridge", }, + {}, +}; + +static struct auxiliary_driver ti_sn_bridge_driver = { + .name = "bridge", + .probe = ti_sn_bridge_probe, + .remove = ti_sn_bridge_remove, + .id_table = ti_sn_bridge_id_table, +}; + +/* ----------------------------------------------------------------------------- + * GPIO Controller + */ + #if defined(CONFIG_OF_GPIO) static int tn_sn_bridge_of_xlate(struct gpio_chip *chip, @@ -1265,171 +1466,27 @@ static inline void ti_sn_gpio_unregister(void) {} #endif -static void ti_sn_bridge_parse_lanes(struct ti_sn65dsi86 *pdata, - struct device_node *np) -{ - u32 lane_assignments[SN_MAX_DP_LANES] = { 0, 1, 2, 3 }; - u32 lane_polarities[SN_MAX_DP_LANES] = { }; - struct device_node *endpoint; - u8 ln_assign = 0; - u8 ln_polrs = 0; - int dp_lanes; - int i; - - /* - * Read config from the device tree about lane remapping and lane - * polarities. These are optional and we assume identity map and - * normal polarity if nothing is specified. It's OK to specify just - * data-lanes but not lane-polarities but not vice versa. - * - * Error checking is light (we just make sure we don't crash or - * buffer overrun) and we assume dts is well formed and specifying - * mappings that the hardware supports. - */ - endpoint = of_graph_get_endpoint_by_regs(np, 1, -1); - dp_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); - if (dp_lanes > 0 && dp_lanes <= SN_MAX_DP_LANES) { - of_property_read_u32_array(endpoint, "data-lanes", - lane_assignments, dp_lanes); - of_property_read_u32_array(endpoint, "lane-polarities", - lane_polarities, dp_lanes); - } else { - dp_lanes = SN_MAX_DP_LANES; - } - of_node_put(endpoint); - - /* - * Convert into register format. Loop over all lanes even if - * data-lanes had fewer elements so that we nicely initialize - * the LN_ASSIGN register. - */ - for (i = SN_MAX_DP_LANES - 1; i >= 0; i--) { - ln_assign = ln_assign << LN_ASSIGN_WIDTH | lane_assignments[i]; - ln_polrs = ln_polrs << 1 | lane_polarities[i]; - } - - /* Stash in our struct for when we power on */ - pdata->dp_lanes = dp_lanes; - pdata->ln_assign = ln_assign; - pdata->ln_polrs = ln_polrs; -} - -static int ti_sn_bridge_probe(struct auxiliary_device *adev, - const struct auxiliary_device_id *id) -{ - struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); - struct device_node *np = pdata->dev->of_node; - int ret; - - ret = drm_of_find_panel_or_bridge(np, 1, 0, &pdata->panel, NULL); - if (ret) { - DRM_ERROR("could not find any panel node\n"); - return ret; - } - - ti_sn_bridge_parse_lanes(pdata, np); - - ret = ti_sn_bridge_parse_dsi_host(pdata); - if (ret) - return ret; - - pdata->aux.name = "ti-sn65dsi86-aux"; - pdata->aux.dev = pdata->dev; - pdata->aux.transfer = ti_sn_aux_transfer; - drm_dp_aux_init(&pdata->aux); - - pdata->bridge.funcs = &ti_sn_bridge_funcs; - pdata->bridge.of_node = np; - - drm_bridge_add(&pdata->bridge); - - return 0; -} - -static void ti_sn_bridge_remove(struct auxiliary_device *adev) -{ - struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); - - if (!pdata) - return; - - if (pdata->dsi) { - mipi_dsi_detach(pdata->dsi); - mipi_dsi_device_unregister(pdata->dsi); - } - - kfree(pdata->edid); - - drm_bridge_remove(&pdata->bridge); - - of_node_put(pdata->host_node); -} - -static const struct auxiliary_device_id ti_sn_bridge_id_table[] = { - { .name = "ti_sn65dsi86.bridge", }, - {}, -}; - -static struct auxiliary_driver ti_sn_bridge_driver = { - .name = "bridge", - .probe = ti_sn_bridge_probe, - .remove = ti_sn_bridge_remove, - .id_table = ti_sn_bridge_id_table, -}; +/* ----------------------------------------------------------------------------- + * Probe & Remove + */ static void ti_sn65dsi86_runtime_disable(void *data) { pm_runtime_disable(data); } -static void ti_sn65dsi86_uninit_aux(void *data) -{ - auxiliary_device_uninit(data); -} - -static void ti_sn65dsi86_delete_aux(void *data) -{ - auxiliary_device_delete(data); -} - -/* - * AUX bus docs say that a non-NULL release is mandatory, but it makes no - * sense for the model used here where all of the aux devices are allocated - * in the single shared structure. We'll use this noop as a workaround. - */ -static void ti_sn65dsi86_noop(struct device *dev) {} - -static int ti_sn65dsi86_add_aux_device(struct ti_sn65dsi86 *pdata, - struct auxiliary_device *aux, - const char *name) +static int ti_sn65dsi86_parse_regulators(struct ti_sn65dsi86 *pdata) { - struct device *dev = pdata->dev; - int ret; - - /* - * NOTE: It would be nice to set the "of_node" of our children to be - * the same "of_node"" that the top-level component has. That doesn't - * work, though, since pinctrl will try (and fail) to reserve the - * pins again. Until that gets sorted out the children will just need - * to look at the of_node of the main device. - */ - - aux->name = name; - aux->dev.parent = dev; - aux->dev.release = ti_sn65dsi86_noop; - ret = auxiliary_device_init(aux); - if (ret) - return ret; - ret = devm_add_action_or_reset(dev, ti_sn65dsi86_uninit_aux, aux); - if (ret) - return ret; + unsigned int i; + const char * const ti_sn_bridge_supply_names[] = { + "vcca", "vcc", "vccio", "vpll", + }; - ret = auxiliary_device_add(aux); - if (ret) - return ret; - ret = devm_add_action_or_reset(dev, ti_sn65dsi86_delete_aux, aux); + for (i = 0; i < SN_REGULATOR_SUPPLY_NUM; i++) + pdata->supplies[i].supply = ti_sn_bridge_supply_names[i]; - return ret; + return devm_regulator_bulk_get(pdata->dev, SN_REGULATOR_SUPPLY_NUM, + pdata->supplies); } static int ti_sn65dsi86_probe(struct i2c_client *client, @@ -1454,27 +1511,24 @@ static int ti_sn65dsi86_probe(struct i2c_client *client, pdata->regmap = devm_regmap_init_i2c(client, &ti_sn65dsi86_regmap_config); - if (IS_ERR(pdata->regmap)) { - DRM_ERROR("regmap i2c init failed\n"); - return PTR_ERR(pdata->regmap); - } + if (IS_ERR(pdata->regmap)) + return dev_err_probe(dev, PTR_ERR(pdata->regmap), + "regmap i2c init failed\n"); - pdata->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); - if (IS_ERR(pdata->enable_gpio)) { - DRM_ERROR("failed to get enable gpio from DT\n"); - ret = PTR_ERR(pdata->enable_gpio); - return ret; - } + pdata->enable_gpio = devm_gpiod_get_optional(dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(pdata->enable_gpio)) + return dev_err_probe(dev, PTR_ERR(pdata->enable_gpio), + "failed to get enable gpio from DT\n"); ret = ti_sn65dsi86_parse_regulators(pdata); - if (ret) { - DRM_ERROR("failed to parse regulators\n"); - return ret; - } + if (ret) + return dev_err_probe(dev, ret, "failed to parse regulators\n"); pdata->refclk = devm_clk_get_optional(dev, "refclk"); if (IS_ERR(pdata->refclk)) - return PTR_ERR(pdata->refclk); + return dev_err_probe(dev, PTR_ERR(pdata->refclk), + "failed to get reference clock\n"); pm_runtime_enable(dev); ret = devm_add_action_or_reset(dev, ti_sn65dsi86_runtime_disable, dev); @@ -1490,10 +1544,11 @@ static int ti_sn65dsi86_probe(struct i2c_client *client, * motiviation here is to solve the chicken-and-egg problem of probe * ordering. The bridge wants the panel to be there when it probes. * The panel wants its HPD GPIO (provided by sn65dsi86 on some boards) - * when it probes. There will soon be other devices (DDC I2C bus, PWM) - * that have the same problem. Having sub-devices allows the some sub - * devices to finish probing even if others return -EPROBE_DEFER and - * gets us around the problems. + * when it probes. The panel and maybe backlight might want the DDC + * bus. Soon the PWM provided by the bridge chip will have the same + * problem. Having sub-devices allows the some sub devices to finish + * probing even if others return -EPROBE_DEFER and gets us around the + * problems. */ if (IS_ENABLED(CONFIG_OF_GPIO)) { @@ -1502,7 +1557,13 @@ static int ti_sn65dsi86_probe(struct i2c_client *client, return ret; } - return ti_sn65dsi86_add_aux_device(pdata, &pdata->bridge_aux, "bridge"); + /* + * NOTE: At the end of the AUX channel probe we'll add the aux device + * for the bridge. This is because the bridge can't be used until the + * AUX channel is there and this is a very simple solution to the + * dependency problem. + */ + return ti_sn65dsi86_add_aux_device(pdata, &pdata->aux_aux, "aux"); } static struct i2c_device_id ti_sn65dsi86_id[] = { @@ -1539,12 +1600,18 @@ static int __init ti_sn65dsi86_init(void) if (ret) goto err_main_was_registered; - ret = auxiliary_driver_register(&ti_sn_bridge_driver); + ret = auxiliary_driver_register(&ti_sn_aux_driver); if (ret) goto err_gpio_was_registered; + ret = auxiliary_driver_register(&ti_sn_bridge_driver); + if (ret) + goto err_aux_was_registered; + return 0; +err_aux_was_registered: + auxiliary_driver_unregister(&ti_sn_aux_driver); err_gpio_was_registered: ti_sn_gpio_unregister(); err_main_was_registered: @@ -1557,6 +1624,7 @@ module_init(ti_sn65dsi86_init); static void __exit ti_sn65dsi86_exit(void) { auxiliary_driver_unregister(&ti_sn_bridge_driver); + auxiliary_driver_unregister(&ti_sn_aux_driver); ti_sn_gpio_unregister(); i2c_del_driver(&ti_sn65dsi86_driver); } |