From patchwork Thu Jan 13 07:31:57 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: 12712351 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 30D07C433EF for ; Thu, 13 Jan 2022 07:32:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DFCA11122B8; Thu, 13 Jan 2022 07:32:08 +0000 (UTC) Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7E8DE1122B2 for ; Thu, 13 Jan 2022 07:32:07 +0000 (UTC) Received: by mail-pj1-x102d.google.com with SMTP id ie23-20020a17090b401700b001b38a5318easo9851914pjb.2 for ; Wed, 12 Jan 2022 23:32:07 -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=dGXhh44addCWe8AOzHydLKky1ps+n2furtOGFFp/QwQ=; b=Eaqd/PV04y5G4zT8Tz5X+Pxs26ZZJ6i0vWlfOuzap13frb1NR7IDGmoDVSqw5t0HVs nPhcq1nljBlW8BbEUZICaqEZsqW6KcuUPii/D7+eXxG/ham5gB7b+zbprGZ2vVMxuFF/ 9mYV9G7yeVHmYCn2whlp0W7MgLCD81+9Qaofg= 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=dGXhh44addCWe8AOzHydLKky1ps+n2furtOGFFp/QwQ=; b=FJ8d+Na3cxM0pJyVjBcrp5NCpQE/MnrOMs7Vyp32/C/xZ6uUviTvJsAw82mAIKjnPW pAhhw1rkNo09N7g+R7jbQ5sSrxooFm7Y11X8sCXYdwTzWmVaQn6/IpoM1WnHFhKNDumX X68gN2dOUqnfx+IoJ99YBT4Il/YYQL78Bo4nXZ93aG8NwNg+H1yIX+wGOZ3ZiNh3i8r+ rYRde6YmrgjaMP4xpQ3IrptxiZ2n+iFk2tBcy1lF4aWamKq6LBtXZjdEAW7lj+Gfsd27 bIZysoCexk71/l92YUc7SmS9dizUMkDsEei7VXwTQNGCYxOveRUlyVZdefeTvjFulB98 tcIA== X-Gm-Message-State: AOAM530uKmxjJy6o1vO5WdFOmBYSw6P+w5zzFlSbi9Z5faIrYuzbuvOP tv9VQzA5sdULdv4qlBWMl8og2GdlE+xajw== X-Google-Smtp-Source: ABdhPJwsizx1s2fB9QFU0nisjqZob7TQqUIw9/kvY3DshLIezzzM1gqFN+0ELBu28qLMTcFtkttaMg== X-Received: by 2002:a63:905:: with SMTP id 5mr2889464pgj.485.1642059126973; Wed, 12 Jan 2022 23:32:06 -0800 (PST) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:3ced:e0da:4852:430c]) by smtp.gmail.com with ESMTPSA id om3sm7747701pjb.49.2022.01.12.23.32.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Jan 2022 23:32:06 -0800 (PST) From: Hsin-Yi Wang To: Robert Foss , Rob Herring , Xin Ji Subject: [PATCH v2 2/3] drm/bridge: anx7625: Support reading edid through aux channel Date: Thu, 13 Jan 2022 15:31:57 +0800 Message-Id: <20220113073158.2171673-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.34.1.575.g55b058a8bb-goog In-Reply-To: <20220113073158.2171673-1-hsinyi@chromium.org> References: <20220113073158.2171673-1-hsinyi@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Jernej Skrabec , Neil Armstrong , David Airlie , Jonas Karlman , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Andrzej Hajda , Laurent Pinchart , Sam Ravnborg , Maxime Ripard Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 --- v1->v2: Fix cmd for native read/write. This patch is based on drm-misc-next and depends on https://patchwork.freedesktop.org/patch/469081/ --- drivers/gpu/drm/bridge/analogix/anx7625.c | 127 +++++++++++++++++++--- drivers/gpu/drm/bridge/analogix/anx7625.h | 4 + 2 files changed, 113 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index dbe708eb3bcf11..24665bb93f9244 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 +232,22 @@ 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; - 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 +266,7 @@ 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 == DPCD_WRITE) + if (op == DPCD_WRITE || op == AP_AUX_WRITE) ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client, AP_AUX_BUFF_START, len, buf); /* Enable aux access */ @@ -275,14 +279,14 @@ 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 == DPCD_WRITE) - return 0; + if (op == DPCD_WRITE || op == AP_AUX_WRITE) + return len; /* Read done, read out dpcd data */ ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client, @@ -292,7 +296,7 @@ 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 +871,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx) } /* Read downstream capability */ - anx7625_aux_dpcd_trans(ctx, DPCD_READ, 0x68028, 1, &bcap); + anx7625_aux_trans(ctx, DPCD_READ, 0x68028, 1, &bcap); if (!(bcap & 0x01)) { pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap); return 0; @@ -956,7 +960,7 @@ 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, DPCD_WRITE, 0x000600, 1, &data); + ret |= anx7625_aux_trans(ctx, DPCD_WRITE, 0x000600, 1, &data); if (ret < 0) DRM_DEV_ERROR(dev, "IO error : mute video fail\n"); @@ -1655,11 +1659,64 @@ 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, op; + int ret = 0; + + pm_runtime_get_sync(dev); + msg->reply = 0; + switch (request) { + case DP_AUX_NATIVE_WRITE: + op = DPCD_WRITE; + break; + case DP_AUX_I2C_WRITE: + op = AP_AUX_WRITE; + break; + case DP_AUX_NATIVE_READ: + op = DPCD_READ; + break; + case DP_AUX_I2C_READ: + op = AP_AUX_READ; + break; + default: + ret = -EINVAL; + } + if (!ret) { + ret = anx7625_aux_trans(ctx, op, 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 +2123,13 @@ 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 +2143,13 @@ 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 +2415,7 @@ 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 +2573,12 @@ 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 +2601,6 @@ 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 +2648,19 @@ 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 +2668,12 @@ 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 +2686,8 @@ 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 56165f5b254c14..cab19735c22e21 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.h +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h @@ -231,6 +231,9 @@ #define AP_AUX_ADDR_15_8 0x12 #define AP_AUX_ADDR_19_16 0x13 +#define AP_AUX_READ 0x1 +#define AP_AUX_WRITE 0x4 + /* Bit[0:3] AUX status, bit 4 op_en, bit 5 address only */ #define AP_AUX_CTRL_STATUS 0x14 #define AP_AUX_CTRL_OP_EN 0x10 @@ -474,6 +477,7 @@ struct anx7625_data { u8 bridge_attached; struct drm_connector *connector; struct mipi_dsi_device *dsi; + struct drm_dp_aux aux; }; #endif /* __ANX7625_H__ */