| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <aTGJXAnlkK5vQTzk@kuha>
Date: Thu, 4 Dec 2025 15:15:08 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Xin Ji <xji@...logixsemi.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] drm: bridge: anx7625: implement minimal Type-C
support
Wed, Nov 26, 2025 at 11:41:57AM +0200, Dmitry Baryshkov kirjoitti:
> ANX7625 can be used as a USB-C controller, handling USB and DP data
> streams. Provide minimal Type-C support necessary for ANX7625 to
> register the Type-C port device and properly respond to data / power
> role events from the Type-C partner.
>
> While ANX7625 provides TCPCI interface, using it would circumvent the
> on-chip running firmware. Analogix recommended using the higher-level
> interface instead of TCPCI.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
FWIW:
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/gpu/drm/bridge/analogix/Kconfig | 1 +
> drivers/gpu/drm/bridge/analogix/anx7625.c | 163 ++++++++++++++++++++++++++++--
> drivers/gpu/drm/bridge/analogix/anx7625.h | 21 +++-
> 3 files changed, 175 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
> index 4846b2e9be7c2a5da18f6a3cdec53ef5766455e0..f3448b0631fea42e7e7ab10368777a93ce33cee7 100644
> --- a/drivers/gpu/drm/bridge/analogix/Kconfig
> +++ b/drivers/gpu/drm/bridge/analogix/Kconfig
> @@ -34,6 +34,7 @@ config DRM_ANALOGIX_ANX7625
> tristate "Analogix Anx7625 MIPI to DP interface support"
> depends on DRM
> depends on OF
> + depends on TYPEC || !TYPEC
> select DRM_DISPLAY_DP_HELPER
> select DRM_DISPLAY_HDCP_HELPER
> select DRM_DISPLAY_HELPER
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index 6f3fdcb6afdb9d785bc4515300676cf3988c5807..a44405db739669dfd2907b0afd41293a7b173035 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -3,6 +3,7 @@
> * Copyright(c) 2020, Analogix Semiconductor. All rights reserved.
> *
> */
> +#include <linux/cleanup.h>
> #include <linux/gcd.h>
> #include <linux/gpio/consumer.h>
> #include <linux/i2c.h>
> @@ -15,6 +16,9 @@
> #include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/types.h>
> +#include <linux/usb.h>
> +#include <linux/usb/pd.h>
> +#include <linux/usb/role.h>
> #include <linux/workqueue.h>
>
> #include <linux/of_graph.h>
> @@ -1325,7 +1329,7 @@ static int anx7625_read_hpd_gpio_config_status(struct anx7625_data *ctx)
> static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
> {
> struct device *dev = ctx->dev;
> - int ret, val;
> + int ret;
>
> /* Reset main ocm */
> ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x40);
> @@ -1339,6 +1343,11 @@ static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
> DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature fail.\n");
> else
> DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature succeeded.\n");
> +}
> +
> +static void anx7625_configure_hpd(struct anx7625_data *ctx)
> +{
> + int val;
>
> /*
> * Make sure the HPD GPIO already be configured after OCM release before
> @@ -1369,7 +1378,9 @@ static int anx7625_ocm_loading_check(struct anx7625_data *ctx)
> if ((ret & FLASH_LOAD_STA_CHK) != FLASH_LOAD_STA_CHK)
> return -ENODEV;
>
> - anx7625_disable_pd_protocol(ctx);
> + if (!ctx->typec_port)
> + anx7625_disable_pd_protocol(ctx);
> + anx7625_configure_hpd(ctx);
>
> DRM_DEV_DEBUG_DRIVER(dev, "Firmware ver %02x%02x,",
> anx7625_reg_read(ctx,
> @@ -1472,6 +1483,115 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
> DRM_DEV_DEBUG_DRIVER(dev, "Secure OCM version=%02x\n", ret);
> }
>
> +#if IS_REACHABLE(CONFIG_TYPEC)
> +static void anx7625_typec_set_orientation(struct anx7625_data *ctx)
> +{
> + u32 val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
> +
> + if (val & (CC1_RP | CC1_RD))
> + typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_NORMAL);
> + else if (val & (CC2_RP | CC2_RD))
> + typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_REVERSE);
> + else
> + typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_NONE);
> +}
> +
> +static void anx7625_typec_isr(struct anx7625_data *ctx,
> + unsigned int intr_vector,
> + unsigned int intr_status)
> +{
> + if (intr_vector & CC_STATUS)
> + anx7625_typec_set_orientation(ctx);
> + if (intr_vector & DATA_ROLE_STATUS) {
> + usb_role_switch_set_role(ctx->role_sw,
> + (intr_status & DATA_ROLE_STATUS) ?
> + USB_ROLE_HOST : USB_ROLE_DEVICE);
> + typec_set_data_role(ctx->typec_port,
> + (intr_status & DATA_ROLE_STATUS) ?
> + TYPEC_HOST : TYPEC_DEVICE);
> + }
> + if (intr_vector & VBUS_STATUS)
> + typec_set_pwr_role(ctx->typec_port,
> + (intr_status & VBUS_STATUS) ?
> + TYPEC_SOURCE : TYPEC_SINK);
> + if (intr_vector & VCONN_STATUS)
> + typec_set_vconn_role(ctx->typec_port,
> + (intr_status & VCONN_STATUS) ?
> + TYPEC_SOURCE : TYPEC_SINK);
> +}
> +
> +static int anx7625_typec_register(struct anx7625_data *ctx)
> +{
> + struct typec_capability typec_cap = { };
> + struct fwnode_handle *fwnode __free(fwnode_handle) = NULL;
> + u32 val;
> + int ret;
> +
> + fwnode = device_get_named_child_node(ctx->dev, "connector");
> + if (!fwnode)
> + return 0;
> +
> + ret = typec_get_fw_cap(&typec_cap, fwnode);
> + if (ret < 0)
> + return ret;
> +
> + typec_cap.revision = 0x0120;
> + typec_cap.pd_revision = 0x0300;
> + typec_cap.usb_capability = USB_CAPABILITY_USB2 | USB_CAPABILITY_USB3;
> + typec_cap.orientation_aware = true;
> +
> + typec_cap.driver_data = ctx;
> +
> + ctx->typec_port = typec_register_port(ctx->dev, &typec_cap);
> + if (IS_ERR(ctx->typec_port))
> + return PTR_ERR(ctx->typec_port);
> +
> + ctx->role_sw = fwnode_usb_role_switch_get(fwnode);
> + if (IS_ERR(ctx->role_sw)) {
> + typec_unregister_port(ctx->typec_port);
> + return PTR_ERR(ctx->role_sw);
> + }
> +
> + val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
> + anx7625_typec_set_orientation(ctx);
> + usb_role_switch_set_role(ctx->role_sw,
> + (val & DATA_ROLE_STATUS) ?
> + USB_ROLE_HOST : USB_ROLE_DEVICE);
> + typec_set_data_role(ctx->typec_port,
> + (val & DATA_ROLE_STATUS) ?
> + TYPEC_HOST : TYPEC_DEVICE);
> + typec_set_pwr_role(ctx->typec_port,
> + (val & VBUS_STATUS) ?
> + TYPEC_SOURCE : TYPEC_SINK);
> + typec_set_vconn_role(ctx->typec_port,
> + (val & VCONN_STATUS) ?
> + TYPEC_SOURCE : TYPEC_SINK);
> +
> + return 0;
> +}
> +
> +static void anx7625_typec_unregister(struct anx7625_data *ctx)
> +{
> + usb_role_switch_put(ctx->role_sw);
> + typec_unregister_port(ctx->typec_port);
> +}
> +#else
> +static void anx7625_typec_isr(struct anx7625_data *ctx,
> + unsigned int intr_vector,
> + unsigned int intr_status)
> +{
> +}
> +
> +static int anx7625_typec_register(struct anx7625_data *ctx)
> +{
> + return 0;
> +}
> +
> +static void anx7625_typec_unregister(struct anx7625_data *ctx)
> +{
> +}
> +#endif
> +
> static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
> {
> return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
> @@ -1566,7 +1686,7 @@ static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
> }
> }
>
> -static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
> +static int anx7625_intr_status(struct anx7625_data *ctx)
> {
> int intr_vector, status;
> struct device *dev = ctx->dev;
> @@ -1593,9 +1713,6 @@ static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
> return status;
> }
>
> - if (!(intr_vector & HPD_STATUS_CHANGE))
> - return -ENOENT;
> -
> status = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
> SYSTEM_STSTUS);
> if (status < 0) {
> @@ -1604,6 +1721,12 @@ static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
> }
>
> DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x45=%x\n", status);
> +
> + anx7625_typec_isr(ctx, intr_vector, status);
> +
> + if (!(intr_vector & HPD_STATUS))
> + return -ENOENT;
> +
> dp_hpd_change_handler(ctx, status & HPD_STATUS);
>
> return 0;
> @@ -1622,7 +1745,7 @@ static void anx7625_work_func(struct work_struct *work)
> return;
> }
>
> - event = anx7625_hpd_change_detect(ctx);
> + event = anx7625_intr_status(ctx);
>
> mutex_unlock(&ctx->lock);
>
> @@ -2741,11 +2864,29 @@ static int anx7625_i2c_probe(struct i2c_client *client)
> }
>
> if (!platform->pdata.low_power_mode) {
> - anx7625_disable_pd_protocol(platform);
> + struct fwnode_handle *fwnode;
> +
> + fwnode = device_get_named_child_node(dev, "connector");
> + if (fwnode)
> + fwnode_handle_put(fwnode);
> + else
> + anx7625_disable_pd_protocol(platform);
> +
> + anx7625_configure_hpd(platform);
> +
> pm_runtime_get_sync(dev);
> _anx7625_hpd_polling(platform, 5000 * 100);
> }
>
> + if (platform->pdata.intp_irq)
> + anx7625_reg_write(platform, platform->i2c.rx_p0_client,
> + INTERFACE_CHANGE_INT_MASK, 0);
> +
> + /* After getting runtime handle */
> + ret = anx7625_typec_register(platform);
> + if (ret)
> + goto pm_suspend;
> +
> /* Add work function */
> if (platform->pdata.intp_irq) {
> enable_irq(platform->pdata.intp_irq);
> @@ -2759,6 +2900,10 @@ static int anx7625_i2c_probe(struct i2c_client *client)
>
> return 0;
>
> +pm_suspend:
> + if (!platform->pdata.low_power_mode)
> + pm_runtime_put_sync_suspend(&client->dev);
> +
> free_wq:
> if (platform->workqueue)
> destroy_workqueue(platform->workqueue);
> @@ -2774,6 +2919,8 @@ static void anx7625_i2c_remove(struct i2c_client *client)
> {
> struct anx7625_data *platform = i2c_get_clientdata(client);
>
> + anx7625_typec_unregister(platform);
> +
> drm_bridge_remove(&platform->bridge);
>
> if (platform->pdata.intp_irq)
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
> index eb5580f1ab2f86b48b6f2df4fa4d6c3be603ad48..f9570cd6d22e55fd70a12c15960714cbb783d059 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.h
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
> @@ -51,9 +51,21 @@
> #define INTR_RECEIVED_MSG BIT(5)
>
> #define SYSTEM_STSTUS 0x45
> +#define INTERFACE_CHANGE_INT_MASK 0x43
> #define INTERFACE_CHANGE_INT 0x44
> -#define HPD_STATUS_CHANGE 0x80
> -#define HPD_STATUS 0x80
> +#define VCONN_STATUS BIT(2)
> +#define VBUS_STATUS BIT(3)
> +#define CC_STATUS BIT(4)
> +#define DATA_ROLE_STATUS BIT(5)
> +#define HPD_STATUS BIT(7)
> +
> +#define NEW_CC_STATUS 0x46
> +#define CC1_RD BIT(0)
> +#define CC1_RA BIT(1)
> +#define CC1_RP (BIT(2) | BIT(3))
> +#define CC2_RD BIT(4)
> +#define CC2_RA BIT(5)
> +#define CC2_RP (BIT(6) | BIT(7))
>
> /******** END of I2C Address 0x58 ********/
>
> @@ -447,9 +459,14 @@ struct anx7625_i2c_client {
> struct i2c_client *tcpc_client;
> };
>
> +struct typec_port;
> +struct usb_role_switch;
> +
> struct anx7625_data {
> struct anx7625_platform_data pdata;
> struct platform_device *audio_pdev;
> + struct typec_port *typec_port;
> + struct usb_role_switch *role_sw;
> int hpd_status;
> int hpd_high_cnt;
> int dp_en;
>
> --
> 2.47.3
--
heikki
Powered by blists - more mailing lists