From patchwork Thu Feb 3 14:10:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hsin-Yi Wang X-Patchwork-Id: 539684 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91926C433EF for ; Thu, 3 Feb 2022 14:10:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239498AbiBCOKn (ORCPT ); Thu, 3 Feb 2022 09:10:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351047AbiBCOKi (ORCPT ); Thu, 3 Feb 2022 09:10:38 -0500 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D688CC06173B for ; Thu, 3 Feb 2022 06:10:36 -0800 (PST) Received: by mail-pj1-x1031.google.com with SMTP id z14-20020a17090ab10e00b001b6175d4040so10182847pjq.0 for ; Thu, 03 Feb 2022 06:10:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZlPEW9xoPb6RcLYn+IFQIFNm6/ZMlPRQj6f3Thr7uBo=; b=Da/ofw+FoJww+d6Vh/QratTwGQNkfZhvUnWPwjl8rt4rvPCpys3Qr3k344XAu26xZ6 D2RZK0fuHbwsFjiivpGK7Wf3Ps1oUvGQAtHc3i9YpYdoCa4X6Nrm7ugej4Q3KQp1cL3A vUt1Ogi/m1TCTMR7N5V/prNA4irGvjNVQnJlI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ZlPEW9xoPb6RcLYn+IFQIFNm6/ZMlPRQj6f3Thr7uBo=; b=1QB3NxGixmQkD0gmGYAw48221atyyIusesoTomRXtehpQ/gVrEw+lXHj/cZo4bwI5V GEBr1UzV8/2uNAWvWzKtyrt4cCAQCQiqUAEvlF1YO2hUK+3kfzEJjTEXlyZGXYcJfSec LqI3Fg9oeZK9AQ/aosU9W8cj7lYR4jgOu3Nhse+SRxw+MyuB1S99fIlrhE5J/vvhSuMG dJMppVkwo6Tidzt1vIk0BUhQSyPWeYVQxd32y3YXGPal2cjXfaeYRMVw2a8obRB2okS8 3mNkY+1yjY6N3KEgjUMpl7Kbn02aCavjNaNZZING8SaFZBtWrMGj/HOP6sT0RTG0DG5E qdFw== X-Gm-Message-State: AOAM53282CN1QuwKXEW7IxNx4pq+MJxQxVf7jgoYSJ3QHnp+ko9rq71l Ihq/VtqZTZCbkAjsJvIFlNiptw== X-Google-Smtp-Source: ABdhPJwxyyHJ6GTnk3XwGMBrVLQ0N50ECbJFUmZ/YB9LpizbnOqbb4ouLWeYfK3PhzPfMOxKjN2yWQ== X-Received: by 2002:a17:902:cec2:: with SMTP id d2mr36719743plg.153.1643897436242; Thu, 03 Feb 2022 06:10:36 -0800 (PST) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:cbdf:65ae:127:f762]) by smtp.gmail.com with ESMTPSA id w11sm29532818pfu.50.2022.02.03.06.10.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Feb 2022 06:10:35 -0800 (PST) From: Hsin-Yi Wang To: Robert Foss , Rob Herring , Xin Ji Cc: David Airlie , Daniel Vetter , Laurent Pinchart , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong , Jonas Karlman , Jernej Skrabec , Sam Ravnborg , Maxime Ripard Subject: [PATCH v6 3/4] drm/bridge: anx7625: Support reading edid through aux channel Date: Thu, 3 Feb 2022 22:10:22 +0800 Message-Id: <20220203141023.570180-3-hsinyi@chromium.org> X-Mailer: git-send-email 2.35.0.rc2.247.g8bbb082509-goog In-Reply-To: <20220203141023.570180-1-hsinyi@chromium.org> References: <20220203141023.570180-1-hsinyi@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Support reading edid through aux channel if panel is connected to aux bus. Extend anx7625_aux_dpcd_trans() to implement aux transfer function: 1. panel is populated in devm_of_dp_aux_populate_ep_devices(), so move anx7625_parse_dt() after. 2. Use pm runtime autosuspend since aux transfer function is called multiple times when reading edid. 3. No-op if aux transfer length is 0. Signed-off-by: Hsin-Yi Wang Reviewed-by: Xin Ji --- v5->v6: fix Kconfig. v4->v5: fix header and indent. v3->v4: rebase to latest drm-misc-next --- drivers/gpu/drm/bridge/analogix/Kconfig | 1 + drivers/gpu/drm/bridge/analogix/anx7625.c | 120 ++++++++++++++++++---- drivers/gpu/drm/bridge/analogix/anx7625.h | 1 + 3 files changed, 104 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig index 319ba0df57be8f..03d3aaa2e84b37 100644 --- a/drivers/gpu/drm/bridge/analogix/Kconfig +++ b/drivers/gpu/drm/bridge/analogix/Kconfig @@ -32,6 +32,7 @@ config DRM_ANALOGIX_ANX7625 tristate "Analogix Anx7625 MIPI to DP interface support" depends on DRM depends on OF + select DRM_DP_AUX_BUS select DRM_MIPI_DSI help ANX7625 is an ultra-low power 4K mobile HD transmitter diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index b7e3373994b480..a59a4f4d2c5b10 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -231,19 +232,23 @@ static int wait_aux_op_finish(struct anx7625_data *ctx) return 0; } -static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op, - u32 address, u8 len, u8 *buf) +static int anx7625_aux_trans(struct anx7625_data *ctx, u8 op, u32 address, + u8 len, u8 *buf) { struct device *dev = &ctx->client->dev; int ret; u8 addrh, addrm, addrl; u8 cmd; + bool is_write = !(op & DP_AUX_I2C_READ); - if (len > MAX_DPCD_BUFFER_SIZE) { + if (len > DP_AUX_MAX_PAYLOAD_BYTES) { dev_err(dev, "exceed aux buffer len.\n"); return -EINVAL; } + if (!len) + return len; + addrl = address & 0xFF; addrm = (address >> 8) & 0xFF; addrh = (address >> 16) & 0xFF; @@ -262,7 +267,7 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op, ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, AP_AUX_ADDR_19_16, addrh); - if (op == DP_AUX_NATIVE_WRITE) + if (is_write) ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client, AP_AUX_BUFF_START, len, buf); /* Enable aux access */ @@ -275,14 +280,14 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op, } ret = wait_aux_op_finish(ctx); - if (ret) { + if (ret < 0) { dev_err(dev, "aux IO error: wait aux op finish.\n"); return ret; } /* Write done */ - if (op == DP_AUX_NATIVE_WRITE) - return 0; + if (is_write) + return len; /* Read done, read out dpcd data */ ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client, @@ -292,7 +297,7 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op, return -EIO; } - return 0; + return len; } static int anx7625_video_mute_control(struct anx7625_data *ctx, @@ -867,7 +872,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx) } /* Read downstream capability */ - anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap); + anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap); if (!(bcap & 0x01)) { pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap); return 0; @@ -956,7 +961,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx) dev_dbg(dev, "notify downstream enter into standby\n"); /* Downstream monitor enter into standby mode */ data = 2; - ret |= anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data); + ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data); if (ret < 0) DRM_DEV_ERROR(dev, "IO error : mute video fail\n"); @@ -1655,11 +1660,56 @@ static int anx7625_parse_dt(struct device *dev, return 0; } +static bool anx7625_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 inline struct anx7625_data *bridge_to_anx7625(struct drm_bridge *bridge) { return container_of(bridge, struct anx7625_data, bridge); } +static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux); + struct device *dev = &ctx->client->dev; + u8 request = msg->request & ~DP_AUX_I2C_MOT; + int ret = 0; + + pm_runtime_get_sync(dev); + msg->reply = 0; + switch (request) { + case DP_AUX_NATIVE_WRITE: + case DP_AUX_I2C_WRITE: + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ: + break; + default: + ret = -EINVAL; + } + if (!ret) + ret = anx7625_aux_trans(ctx, msg->request, msg->address, + msg->size, msg->buffer); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + return ret; +} + static struct edid *anx7625_get_edid(struct anx7625_data *ctx) { struct device *dev = &ctx->client->dev; @@ -2066,6 +2116,13 @@ static int anx7625_bridge_attach(struct drm_bridge *bridge, return -ENODEV; } + ctx->aux.drm_dev = bridge->dev; + err = drm_dp_aux_register(&ctx->aux); + if (err) { + dev_err(dev, "failed to register aux channel: %d\n", err); + return err; + } + if (ctx->pdata.panel_bridge) { err = drm_bridge_attach(bridge->encoder, ctx->pdata.panel_bridge, @@ -2079,6 +2136,13 @@ static int anx7625_bridge_attach(struct drm_bridge *bridge, return 0; } +static void anx7625_bridge_detach(struct drm_bridge *bridge) +{ + struct anx7625_data *ctx = bridge_to_anx7625(bridge); + + drm_dp_aux_unregister(&ctx->aux); +} + static enum drm_mode_status anx7625_bridge_mode_valid(struct drm_bridge *bridge, const struct drm_display_info *info, @@ -2344,6 +2408,7 @@ static struct edid *anx7625_bridge_get_edid(struct drm_bridge *bridge, static const struct drm_bridge_funcs anx7625_bridge_funcs = { .attach = anx7625_bridge_attach, + .detach = anx7625_bridge_detach, .mode_valid = anx7625_bridge_mode_valid, .mode_set = anx7625_bridge_mode_set, .atomic_check = anx7625_bridge_atomic_check, @@ -2501,6 +2566,12 @@ static const struct dev_pm_ops anx7625_pm_ops = { anx7625_runtime_pm_resume, NULL) }; +static void anx7625_runtime_disable(void *data) +{ + pm_runtime_dont_use_autosuspend(data); + pm_runtime_disable(data); +} + static int anx7625_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -2523,13 +2594,6 @@ static int anx7625_i2c_probe(struct i2c_client *client, pdata = &platform->pdata; - ret = anx7625_parse_dt(dev, pdata); - if (ret) { - if (ret != -EPROBE_DEFER) - DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret); - return ret; - } - platform->client = client; i2c_set_clientdata(client, platform); @@ -2577,6 +2641,19 @@ static int anx7625_i2c_probe(struct i2c_client *client, } } + platform->aux.name = "anx7625-aux"; + platform->aux.dev = dev; + platform->aux.transfer = anx7625_aux_transfer; + drm_dp_aux_init(&platform->aux); + devm_of_dp_aux_populate_ep_devices(&platform->aux); + + ret = anx7625_parse_dt(dev, pdata); + if (ret) { + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret); + return ret; + } + if (anx7625_register_i2c_dummy_clients(platform, client) != 0) { ret = -ENOMEM; DRM_DEV_ERROR(dev, "fail to reserve I2C bus.\n"); @@ -2584,6 +2661,12 @@ static int anx7625_i2c_probe(struct i2c_client *client, } pm_runtime_enable(dev); + pm_runtime_set_autosuspend_delay(dev, 1000); + pm_runtime_use_autosuspend(dev); + pm_suspend_ignore_children(dev, true); + ret = devm_add_action_or_reset(dev, anx7625_runtime_disable, dev); + if (ret) + return ret; if (!platform->pdata.low_power_mode) { anx7625_disable_pd_protocol(platform); @@ -2596,7 +2679,8 @@ static int anx7625_i2c_probe(struct i2c_client *client, platform->bridge.funcs = &anx7625_bridge_funcs; platform->bridge.of_node = client->dev.of_node; - platform->bridge.ops = DRM_BRIDGE_OP_EDID; + if (!anx7625_of_panel_on_aux_bus(&client->dev)) + platform->bridge.ops |= DRM_BRIDGE_OP_EDID; if (!platform->pdata.panel_bridge) platform->bridge.ops |= DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_DETECT; diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h index 64a8ab56529404..edbbfe410a56e8 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.h +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h @@ -472,6 +472,7 @@ struct anx7625_data { u8 bridge_attached; struct drm_connector *connector; struct mipi_dsi_device *dsi; + struct drm_dp_aux aux; }; #endif /* __ANX7625_H__ */