From patchwork Tue Nov 6 11:52:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrizio Castro X-Patchwork-Id: 993643 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bp.renesas.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42q7GF4vKFz9sDJ for ; Tue, 6 Nov 2018 22:52:53 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730646AbeKFVRm (ORCPT ); Tue, 6 Nov 2018 16:17:42 -0500 Received: from relmlor3.renesas.com ([210.160.252.173]:57137 "EHLO relmlie2.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730271AbeKFVRm (ORCPT ); Tue, 6 Nov 2018 16:17:42 -0500 Received: from unknown (HELO relmlir4.idc.renesas.com) ([10.200.68.154]) by relmlie2.idc.renesas.com with ESMTP; 06 Nov 2018 20:52:48 +0900 Received: from relmlii1.idc.renesas.com (relmlii1.idc.renesas.com [10.200.68.65]) by relmlir4.idc.renesas.com (Postfix) with ESMTP id CFDA3D308C; Tue, 6 Nov 2018 20:52:48 +0900 (JST) X-IronPort-AV: E=Sophos;i="5.54,471,1534777200"; d="scan'208";a="295303820" Received: from unknown (HELO fabrizio-dev.ree.adwin.renesas.com) ([10.226.36.250]) by relmlii1.idc.renesas.com with ESMTP; 06 Nov 2018 20:52:44 +0900 From: Fabrizio Castro To: Archit Taneja , Andrzej Hajda , David Airlie , Peter Rosin , Wolfram Sang , Mark Brown Cc: Fabrizio Castro , Laurent Pinchart , dri-devel@lists.freedesktop.org, Simon Horman , Geert Uytterhoeven , Chris Paterson , Biju Das , linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org, Inki Dae , Boris Brezillon , Linus Walleij Subject: [PATCH v3] drm/bridge/sii902x: Fix EDID readback Date: Tue, 6 Nov 2018 11:52:36 +0000 Message-Id: <1541505156-8097-1-git-send-email-fabrizio.castro@bp.renesas.com> X-Mailer: git-send-email 2.7.4 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org While adding SiI9022A support to the iwg23s board, it came up that when the HDMI transmitter is in pass through mode the device is not compliant with the I2C specification anymore, as it requires a far bigger tbuf, due to a delay the HDMI transmitter is adding when relaying the STOP condition on the monitor i2c side of things. When not providing an appropriate delay after the STOP condition the i2c bus would get stuck. Also, any other traffic on the bus while talking to the monitor may cause the transaction to fail or even cause issues with the i2c bus as well. I2c-gates seemed to reach consent as a possible way to address these issues, and as such this patch is implementing a solution based on that. Since others are clearly relying on the current implementation of the driver, this patch won't require any DT changes. Since we don't want any interference during the DDC Bus Request/Grant procedure and while talking to the monitor, we have to use the adapter locking primitives rather than the i2c-mux locking primitives. Signed-off-by: Fabrizio Castro Reviewed-by: Peter Rosin Acked-by: Boris Brezillon Acked-by: Linus Walleij Reviewed-by: Peter Rosin --- v2->v3: * Incorporated comments from Boris Brezillon and Peter Rosin v1->v2: * Incorporated comments from Peter Rosin drivers/gpu/drm/bridge/sii902x.c | 247 ++++++++++++++++++++++++++++----------- 1 file changed, 178 insertions(+), 69 deletions(-) diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c index e59a135..bfa9020 100644 --- a/drivers/gpu/drm/bridge/sii902x.c +++ b/drivers/gpu/drm/bridge/sii902x.c @@ -1,4 +1,6 @@ /* + * Copyright (C) 2018 Renesas Electronics + * * Copyright (C) 2016 Atmel * Bo Shen * @@ -21,6 +23,7 @@ */ #include +#include #include #include #include @@ -86,8 +89,49 @@ struct sii902x { struct drm_bridge bridge; struct drm_connector connector; struct gpio_desc *reset_gpio; + struct i2c_mux_core *i2cmux; }; +static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val) +{ + union i2c_smbus_data data; + int ret; + + ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, + I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data); + + if (ret < 0) + return ret; + + *val = data.byte; + return 0; +} + +static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val) +{ + union i2c_smbus_data data; + + data.byte = val; + + return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, + I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA, + &data); +} + +static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask, + u8 val) +{ + int ret; + u8 status; + + ret = sii902x_read_unlocked(i2c, reg, &status); + if (ret) + return ret; + status &= ~mask; + status |= val & mask; + return sii902x_write_unlocked(i2c, reg, status); +} + static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge) { return container_of(bridge, struct sii902x, bridge); @@ -135,41 +179,11 @@ static const struct drm_connector_funcs sii902x_connector_funcs = { static int sii902x_get_modes(struct drm_connector *connector) { struct sii902x *sii902x = connector_to_sii902x(connector); - struct regmap *regmap = sii902x->regmap; u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; - struct device *dev = &sii902x->i2c->dev; - unsigned long timeout; - unsigned int retries; - unsigned int status; struct edid *edid; - int num = 0; - int ret; - - ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA, - SII902X_SYS_CTRL_DDC_BUS_REQ, - SII902X_SYS_CTRL_DDC_BUS_REQ); - if (ret) - return ret; - - timeout = jiffies + - msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); - do { - ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status); - if (ret) - return ret; - } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) && - time_before(jiffies, timeout)); + int num = 0, ret; - if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) { - dev_err(dev, "failed to acquire the i2c bus\n"); - return -ETIMEDOUT; - } - - ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status); - if (ret) - return ret; - - edid = drm_get_edid(connector, sii902x->i2c->adapter); + edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]); drm_connector_update_edid_property(connector, edid); if (edid) { num = drm_add_edid_modes(connector, edid); @@ -181,42 +195,6 @@ static int sii902x_get_modes(struct drm_connector *connector) if (ret) return ret; - /* - * Sometimes the I2C bus can stall after failure to use the - * EDID channel. Retry a few times to see if things clear - * up, else continue anyway. - */ - retries = 5; - do { - ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, - &status); - retries--; - } while (ret && retries); - if (ret) - dev_err(dev, "failed to read status (%d)\n", ret); - - ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA, - SII902X_SYS_CTRL_DDC_BUS_REQ | - SII902X_SYS_CTRL_DDC_BUS_GRTD, 0); - if (ret) - return ret; - - timeout = jiffies + - msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); - do { - ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status); - if (ret) - return ret; - } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | - SII902X_SYS_CTRL_DDC_BUS_GRTD) && - time_before(jiffies, timeout)); - - if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | - SII902X_SYS_CTRL_DDC_BUS_GRTD)) { - dev_err(dev, "failed to release the i2c bus\n"); - return -ETIMEDOUT; - } - return num; } @@ -366,6 +344,121 @@ static irqreturn_t sii902x_interrupt(int irq, void *data) return IRQ_HANDLED; } +/* + * The purpose of sii902x_i2c_bypass_select is to enable the pass through + * mode of the HDMI transmitter. Do not use regmap from within this function, + * only use sii902x_*_unlocked functions to read/modify/write registers. + * We are holding the parent adapter lock here, keep this in mind before + * adding more i2c transactions. + * + * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere + * in this driver, we need to make sure that we only touch 0x1A[2:1] from + * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that + * we leave the remaining bits as we have found them. + */ +static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) +{ + struct sii902x *sii902x = i2c_mux_priv(mux); + struct device *dev = &sii902x->i2c->dev; + unsigned long timeout; + u8 status; + int ret; + + ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_DDC_BUS_REQ, + SII902X_SYS_CTRL_DDC_BUS_REQ); + if (ret) + return ret; + + timeout = jiffies + + msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + if (ret) + return ret; + } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) && + time_before(jiffies, timeout)); + + if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) { + dev_err(dev, "Failed to acquire the i2c bus\n"); + return -ETIMEDOUT; + } + + return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + status); +} + +/* + * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through + * mode of the HDMI transmitter. Do not use regmap from within this function, + * only use sii902x_*_unlocked functions to read/modify/write registers. + * We are holding the parent adapter lock here, keep this in mind before + * adding more i2c transactions. + * + * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere + * in this driver, we need to make sure that we only touch 0x1A[2:1] from + * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that + * we leave the remaining bits as we have found them. + */ +static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) +{ + struct sii902x *sii902x = i2c_mux_priv(mux); + struct device *dev = &sii902x->i2c->dev; + unsigned long timeout; + unsigned int retries; + u8 status; + int ret; + + /* + * When the HDMI transmitter is in pass through mode, we need an + * (undocumented) additional delay between STOP and START conditions + * to guarantee the bus won't get stuck. + */ + udelay(30); + + /* + * Sometimes the I2C bus can stall after failure to use the + * EDID channel. Retry a few times to see if things clear + * up, else continue anyway. + */ + retries = 5; + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + retries--; + } while (ret && retries); + if (ret) { + dev_err(dev, "failed to read status (%d)\n", ret); + return ret; + } + + ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD, 0); + if (ret) + return ret; + + timeout = jiffies + + msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + if (ret) + return ret; + } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD) && + time_before(jiffies, timeout)); + + if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD)) { + dev_err(dev, "failed to release the i2c bus\n"); + return -ETIMEDOUT; + } + + return 0; +} + static int sii902x_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -375,6 +468,13 @@ static int sii902x_probe(struct i2c_client *client, u8 chipid[4]; int ret; + ret = i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA); + if (!ret) { + dev_err(dev, "I2C adapter not suitable\n"); + return -EIO; + } + sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL); if (!sii902x) return -ENOMEM; @@ -433,7 +533,15 @@ static int sii902x_probe(struct i2c_client *client, i2c_set_clientdata(client, sii902x); - return 0; + sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev, + 1, 0, I2C_MUX_GATE, + sii902x_i2c_bypass_select, + sii902x_i2c_bypass_deselect); + if (!sii902x->i2cmux) + return -ENOMEM; + + sii902x->i2cmux->priv = sii902x; + return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0); } static int sii902x_remove(struct i2c_client *client) @@ -441,6 +549,7 @@ static int sii902x_remove(struct i2c_client *client) { struct sii902x *sii902x = i2c_get_clientdata(client); + i2c_mux_del_adapters(sii902x->i2cmux); drm_bridge_remove(&sii902x->bridge); return 0;