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Message-ID: <CAA8EJpr6ABuQof5doeX2hkGZGADwoaozF-vtPd+GqqrzwyAykA@mail.gmail.com>
Date: Fri, 24 Mar 2023 22:08:07 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Mark Yacoub <markyacoub@...omium.org>
Cc: Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, seanpaul@...omium.org,
suraj.kandpal@...el.com, dianders@...omium.org,
Stephen Boyd <swboyd@...omium.org>,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v7 10/10] drm/msm: Implement HDCP 1.x using the new drm
HDCP helpers
On Fri, 24 Mar 2023 at 21:21, Mark Yacoub <markyacoub@...omium.org> wrote:
>
> From: Sean Paul <seanpaul@...omium.org>
>
> Add HDCP 1.x support to msm DP bridges using the new HDCP
> helpers.
>
> Cc: Stephen Boyd <swboyd@...omium.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
>
> ---
>
> Changes in v2:
> -Squash [1] into this patch with the following changes (Stephen)
> -Update the sc7180 dtsi file
> -Remove resource names and just use index (Stephen)
> Changes in v3:
> -Split out the dtsi change from v2 (Stephen)
> -Fix set-but-unused warning identified by 0-day
> -Fix up a couple of style nits (Stephen)
> -Store HDCP key directly in dp_hdcp struct (Stephen)
> -Remove wmb in HDCP key initialization, move an_seed (Stephen)
> -Use FIELD_PREP for bstatus/bcaps (Stephen)
> -#define read_poll_timeout values (Stephen)
> -Remove unnecessary parentheses in dp_hdcp_store_ksv_fifo (Stephen)
> -Add compatible string for hdcp (Stephen)
> -Rename dp_hdcp_write_* functions (Abhinav)
> -Add 1us delay between An reads (Abhinav)
> -Delete unused dp_hdcp_read_* functions
> Changes in v4:
> -Rebase on Bjorn's multi-dp patchset
> Changes in v5:
> -Change return check of drm_hdcp_helper_initialize_dp() (Stephen)
> Changes in v6:
> -Change the tracking of the state from connector state to bridge as
> state as drm_connector_state is no longer tracked and the functionality
> has moved to msm_dp_bridge
> Changes in v7:
> -Use dp bridge to maintain the state with no use for connector
>
> drivers/gpu/drm/msm/Kconfig | 1 +
> drivers/gpu/drm/msm/Makefile | 1 +
> drivers/gpu/drm/msm/dp/dp_debug.c | 48 ++-
> drivers/gpu/drm/msm/dp/dp_debug.h | 17 +-
> drivers/gpu/drm/msm/dp/dp_display.c | 42 ++-
> drivers/gpu/drm/msm/dp/dp_display.h | 5 +
> drivers/gpu/drm/msm/dp/dp_drm.c | 39 ++-
> drivers/gpu/drm/msm/dp/dp_drm.h | 12 +-
> drivers/gpu/drm/msm/dp/dp_hdcp.c | 483 ++++++++++++++++++++++++++++
> drivers/gpu/drm/msm/dp/dp_hdcp.h | 31 ++
> drivers/gpu/drm/msm/dp/dp_parser.c | 19 ++
> drivers/gpu/drm/msm/dp/dp_parser.h | 4 +
> drivers/gpu/drm/msm/dp/dp_reg.h | 30 +-
> drivers/gpu/drm/msm/msm_atomic.c | 19 ++
> 14 files changed, 732 insertions(+), 19 deletions(-)
> create mode 100644 drivers/gpu/drm/msm/dp/dp_hdcp.c
> create mode 100644 drivers/gpu/drm/msm/dp/dp_hdcp.h
>
> diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> index 86f0e64cbda30..c3e4d6102a5fa 100644
> --- a/drivers/gpu/drm/msm/Kconfig
> +++ b/drivers/gpu/drm/msm/Kconfig
> @@ -15,6 +15,7 @@ config DRM_MSM
> select REGULATOR
> select DRM_DP_AUX_BUS
> select DRM_DISPLAY_DP_HELPER
> + select DRM_DISPLAY_HDCP_HELPER
> select DRM_DISPLAY_HELPER
> select DRM_KMS_HELPER
> select DRM_PANEL
> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> index 7274c41228ed9..a73e7b858af27 100644
> --- a/drivers/gpu/drm/msm/Makefile
> +++ b/drivers/gpu/drm/msm/Makefile
> @@ -122,6 +122,7 @@ msm-$(CONFIG_DRM_MSM_DP)+= dp/dp_aux.o \
> dp/dp_ctrl.o \
> dp/dp_display.o \
> dp/dp_drm.o \
> + dp/dp_hdcp.o \
> dp/dp_hpd.o \
> dp/dp_link.o \
> dp/dp_panel.o \
> diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
> index 5e35033ba3e43..e97d27edbb13b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_debug.c
> +++ b/drivers/gpu/drm/msm/dp/dp_debug.c
> @@ -8,6 +8,7 @@
> #include <linux/debugfs.h>
> #include <drm/drm_connector.h>
> #include <drm/drm_file.h>
> +#include <drm/display/drm_hdcp_helper.h>
>
> #include "dp_parser.h"
> #include "dp_catalog.h"
> @@ -15,6 +16,7 @@
> #include "dp_ctrl.h"
> #include "dp_debug.h"
> #include "dp_display.h"
> +#include "dp_hdcp.h"
>
> #define DEBUG_NAME "msm_dp"
>
> @@ -25,6 +27,7 @@ struct dp_debug_private {
> struct dp_link *link;
> struct dp_panel *panel;
> struct drm_connector *connector;
> + struct dp_hdcp *hdcp;
> struct device *dev;
> struct drm_device *drm_dev;
>
> @@ -196,6 +199,35 @@ static int dp_test_active_open(struct inode *inode,
> inode->i_private);
> }
>
> +static ssize_t dp_hdcp_key_write(struct file *file, const char __user *ubuf,
> + size_t len, loff_t *offp)
> +{
> + char *input_buffer;
> + int ret;
> + struct dp_debug_private *debug = file->private_data;
> +
> + if (len != (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN))
> + return -EINVAL;
> +
> + if (!debug->hdcp)
> + return -ENOENT;
> +
> + input_buffer = memdup_user_nul(ubuf, len);
> + if (IS_ERR(input_buffer))
> + return PTR_ERR(input_buffer);
> +
> + ret = dp_hdcp_ingest_key(debug->hdcp, input_buffer, len);
> +
> + kfree(input_buffer);
> + if (ret < 0) {
> + DRM_ERROR("Could not ingest HDCP key, ret=%d\n", ret);
> + return ret;
> + }
> +
> + *offp += len;
> + return len;
> +}
> +
> static const struct file_operations test_active_fops = {
> .owner = THIS_MODULE,
> .open = dp_test_active_open,
> @@ -205,6 +237,12 @@ static const struct file_operations test_active_fops = {
> .write = dp_test_active_write
> };
>
> +static const struct file_operations dp_hdcp_key_fops = {
> + .owner = THIS_MODULE,
> + .open = simple_open,
> + .write = dp_hdcp_key_write,
> +};
> +
> static void dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
> {
> char path[64];
> @@ -229,11 +267,16 @@ static void dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
> debugfs_create_file("msm_dp_test_type", 0444,
> debug->root,
> debug, &dp_test_type_fops);
> +
> + debugfs_create_file("msm_dp_hdcp_key", 0222, minor->debugfs_root, debug,
> + &dp_hdcp_key_fops);
> }
>
> struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
> - struct dp_usbpd *usbpd, struct dp_link *link,
> - struct drm_connector *connector, struct drm_minor *minor)
> + struct dp_usbpd *usbpd, struct dp_link *link,
> + struct dp_hdcp *hdcp,
> + struct drm_connector *connector,
> + struct drm_minor *minor)
Please, do not mix cleanup/reindentation and actual changes. The chunk
above makes it hard to spot the actual difference: addition of struct
dp_hdcp pointer. Please revert _all_ indentation changes (or move them
to a separate cleanup patch).
> {
> struct dp_debug_private *debug;
> struct dp_debug *dp_debug;
> @@ -255,6 +298,7 @@ struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
> debug->usbpd = usbpd;
> debug->link = link;
> debug->panel = panel;
> + debug->hdcp = hdcp;
> debug->dev = dev;
> debug->drm_dev = minor->dev;
> debug->connector = connector;
> diff --git a/drivers/gpu/drm/msm/dp/dp_debug.h b/drivers/gpu/drm/msm/dp/dp_debug.h
> index 8c0d0b5178fdf..61ecea30d065f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_debug.h
> +++ b/drivers/gpu/drm/msm/dp/dp_debug.h
> @@ -6,6 +6,7 @@
> #ifndef _DP_DEBUG_H_
> #define _DP_DEBUG_H_
>
> +#include "dp_hdcp.h"
> #include "dp_panel.h"
> #include "dp_link.h"
>
> @@ -34,6 +35,7 @@ struct dp_debug {
> * @panel: instance of panel module
> * @usbpd: instance of usbpd module
> * @link: instance of link module
> + * @hdcp: instance of hdcp module
> * @connector: double pointer to display connector
> * @minor: pointer to drm minor number after device registration
> * return: pointer to allocated debug module data
> @@ -42,9 +44,10 @@ struct dp_debug {
> * for debugfs input to be communicated with existing modules
> */
> struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
> - struct dp_usbpd *usbpd, struct dp_link *link,
> - struct drm_connector *connector,
> - struct drm_minor *minor);
> + struct dp_usbpd *usbpd, struct dp_link *link,
> + struct dp_hdcp *hdcp,
> + struct drm_connector *connector,
> + struct drm_minor *minor);
>
> /**
> * dp_debug_put()
> @@ -57,10 +60,10 @@ void dp_debug_put(struct dp_debug *dp_debug);
>
> #else
>
> -static inline
> -struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
> - struct dp_usbpd *usbpd, struct dp_link *link,
> - struct drm_connector *connector, struct drm_minor *minor)
> +static inline struct dp_debug *
> +dp_debug_get(struct device *dev, struct dp_panel *panel, struct dp_usbpd *usbpd,
> + struct dp_link *link, struct dp_hdcp *hdcp,
> + struct drm_connector *connector, struct drm_minor *minor)
> {
> return ERR_PTR(-EINVAL);
> }
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index cbf8fd7a46119..8c099e8a47b73 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -27,6 +27,7 @@
> #include "dp_drm.h"
> #include "dp_audio.h"
> #include "dp_debug.h"
> +#include "dp_hdcp.h"
>
> #define HPD_STRING_SIZE 30
>
> @@ -97,6 +98,7 @@ struct dp_display_private {
> struct dp_panel *panel;
> struct dp_ctrl *ctrl;
> struct dp_debug *debug;
> + struct dp_hdcp *hdcp;
>
> struct dp_usbpd_cb usbpd_cb;
> struct dp_display_mode dp_mode;
> @@ -187,6 +189,14 @@ static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
> return container_of(dp, struct dp_display_private, dp_display);
> }
>
> +struct dp_hdcp *dp_display_bridge_to_hdcp(struct drm_bridge *bridge)
> +{
> + struct msm_dp *dp_display = msm_dp_from_bridge(bridge);
> + struct dp_display_private *dp =
> + container_of(dp_display, struct dp_display_private, dp_display);
> + return dp->hdcp;
> +}
> +
> static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
> u32 data, u32 delay)
> {
> @@ -744,6 +754,7 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
> static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
> {
> dp_debug_put(dp->debug);
> + dp_hdcp_put(dp->hdcp);
> dp_audio_put(dp->audio);
> dp_panel_put(dp->panel);
> dp_aux_put(dp->aux);
> @@ -844,8 +855,18 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
> dp->ctrl->wide_bus_en = dp->wide_bus_en;
> dp->catalog->wide_bus_en = dp->wide_bus_en;
>
> + dp->hdcp = dp_hdcp_get(dp->parser, dp->aux);
> + if (IS_ERR(dp->hdcp)) {
> + rc = PTR_ERR(dp->hdcp);
> + DRM_ERROR("failed to initialize hdcp, rc = %d\n", rc);
> + dp->hdcp = NULL;
> + goto error_hdcp;
> + }
> +
> return rc;
>
> +error_hdcp:
> + dp_audio_put(dp->audio);
> error_ctrl:
> dp_panel_put(dp->panel);
> error_link:
> @@ -957,6 +978,15 @@ int dp_display_set_plugged_cb(struct msm_dp *dp_display,
> return 0;
> }
>
> +void dp_display_hdcp_commit(struct msm_dp *dp, struct drm_atomic_state *state)
> +{
> + struct dp_display_private *dp_display =
> + container_of(dp, struct dp_display_private, dp_display);
> +
> + if (dp_display->hdcp)
> + dp_hdcp_commit(dp_display->hdcp, state);
> +}
> +
> /**
> * dp_bridge_mode_valid - callback to determine if specified mode is valid
> * @bridge: Pointer to drm bridge structure
> @@ -1522,9 +1552,8 @@ void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
> dp = container_of(dp_display, struct dp_display_private, dp_display);
> dev = &dp->pdev->dev;
>
> - dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
> - dp->link, dp->dp_display.connector,
> - minor);
> + dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd, dp->link, dp->hdcp,
> + dp->dp_display.connector, minor);
> if (IS_ERR(dp->debug)) {
> rc = PTR_ERR(dp->debug);
> DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
> @@ -1644,6 +1673,13 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
>
> dp_priv->panel->connector = dp_display->connector;
>
> + ret = dp_hdcp_attach(dp_priv->hdcp, dp_display->connector,
> + dp_display->bridge);
> + if (ret) {
> + DRM_ERROR("Failed to attach hdcp, ret=%d\n", ret);
> + return ret;
> + }
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index dcedf021f7fe1..f4e61273ac7a9 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -30,8 +30,13 @@ struct msm_dp {
> struct dp_audio *dp_audio;
> };
>
> +struct drm_atomic_state;
> +
> int dp_display_set_plugged_cb(struct msm_dp *dp_display,
> hdmi_codec_plugged_cb fn, struct device *codec_dev);
> +struct dp_hdcp *dp_display_bridge_to_hdcp(struct drm_bridge *bridge);
> +void dp_display_hdcp_commit(struct msm_dp *dp_display,
> + struct drm_atomic_state *state);
> int dp_display_get_modes(struct msm_dp *dp_display);
> int dp_display_request_irq(struct msm_dp *dp_display);
> bool dp_display_check_video_test(struct msm_dp *dp_display);
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 6db82f9b03afb..f3710a273d76b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -7,11 +7,19 @@
> #include <drm/drm_atomic.h>
> #include <drm/drm_bridge.h>
> #include <drm/drm_bridge_connector.h>
> +#include <drm/drm_connector.h>
> #include <drm/drm_crtc.h>
> +#include <drm/display/drm_hdcp_helper.h>
>
> #include "msm_drv.h"
> #include "msm_kms.h"
> #include "dp_drm.h"
> +#include "dp_hdcp.h"
> +
> +struct msm_dp *msm_dp_from_bridge(struct drm_bridge *bridge)
> +{
> + return to_dp_bridge(bridge)->dp_display;
> +}
>
> /**
> * dp_bridge_detect - callback to determine if connector is connected
> @@ -37,8 +45,8 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
> struct drm_connector_state *conn_state)
> {
> struct msm_dp *dp;
> -
> - dp = to_dp_bridge(bridge)->dp_display;
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
> + dp = dp_bridge->dp_display;
>
> drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
> (dp->is_connected) ? "true" : "false");
> @@ -54,8 +62,11 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
> * disabled by the hardware and thus all access to it should be forbidden.
> * After that this piece of code can be removed.
> */
> - if (bridge->ops & DRM_BRIDGE_OP_HPD)
> - return (dp->is_connected) ? 0 : -ENOTCONN;
> + if (bridge->ops & DRM_BRIDGE_OP_HPD && !dp->is_connected)
> + return -ENOTCONN;
> +
> + dp_bridge->hdcp_transition =
> + drm_hdcp_has_changed(conn_state->connector, conn_state->state);
>
> return 0;
> }
> @@ -104,6 +115,25 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
> .atomic_check = dp_bridge_atomic_check,
> };
>
> +bool dp_drm_is_bridge_msm_dp(struct drm_bridge *bridge)
> +{
> + return bridge->funcs == &dp_bridge_ops;
> +}
> +
> +void dp_drm_atomic_commit(struct drm_bridge *bridge,
> + struct drm_atomic_state *state)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
> + struct msm_dp *dp_disp;
> +
> + if (!dp_bridge->hdcp_transition)
> + return;
> +
> + dp_disp = msm_dp_from_bridge(bridge);
> +
> + dp_display_hdcp_commit(dp_disp, state);
> +}
> +
> struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> struct drm_encoder *encoder)
> {
> @@ -116,6 +146,7 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
> return ERR_PTR(-ENOMEM);
>
> dp_bridge->dp_display = dp_display;
> + dp_bridge->hdcp_transition = false;
>
> bridge = &dp_bridge->bridge;
> bridge->funcs = &dp_bridge_ops;
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
> index 82035dbb05789..63aff3ed04367 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.h
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.h
> @@ -15,13 +15,21 @@
> struct msm_dp_bridge {
> struct drm_bridge bridge;
> struct msm_dp *dp_display;
> + bool hdcp_transition;
> };
>
> #define to_dp_bridge(x) container_of((x), struct msm_dp_bridge, bridge)
>
> +struct msm_dp *msm_dp_from_bridge(struct drm_bridge *bridge);
> +
> struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display, struct drm_encoder *encoder);
> -struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> - struct drm_encoder *encoder);
> +bool dp_drm_is_bridge_msm_dp(struct drm_bridge *bridge);
> +void dp_drm_atomic_commit(struct drm_bridge *bridge,
> + struct drm_atomic_state *state);
> +
> +struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display,
> + struct drm_device *dev,
> + struct drm_encoder *encoder);
>
> void dp_bridge_enable(struct drm_bridge *drm_bridge);
> void dp_bridge_disable(struct drm_bridge *drm_bridge);
> diff --git a/drivers/gpu/drm/msm/dp/dp_hdcp.c b/drivers/gpu/drm/msm/dp/dp_hdcp.c
> new file mode 100644
> index 0000000000000..303a6dfeec0e8
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/dp/dp_hdcp.c
> @@ -0,0 +1,483 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright (C) 2023 Google, Inc.
> + *
> + * Authors:
> + * Sean Paul <seanpaul@...omium.org>
> + */
> +
> +#include "dp_display.h"
> +#include "dp_drm.h"
> +#include "dp_hdcp.h"
> +#include "dp_reg.h"
> +
> +#include <drm/drm_connector.h>
> +#include <drm/drm_device.h>
> +#include <drm/display/drm_dp_helper.h>
> +#include <drm/display/drm_hdcp_helper.h>
> +#include <drm/drm_print.h>
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/iopoll.h>
> +#include <linux/mutex.h>
> +#include <linux/random.h>
> +#include <linux/slab.h>
> +
> +/* Offsets based on hdcp_ksv mmio */
> +#define DP_HDCP_KSV_AN_LSB 0x0
> +#define DP_HDCP_KSV_AN_MSB 0x4
> +#define DP_HDCP_KSV_AKSV_MSB 0x1D8
> +#define DP_HDCP_KSV_AKSV_LSB 0x1DC
Move them to dp_reg.h?
> +
> +/* Key offsets based on hdcp_key mmio */
> +#define DP_HDCP_KEY_BASE 0x30
> +#define DP_HDCP_KEY_MSB(x) (DP_HDCP_KEY_BASE + (x * 8))
> +#define DP_HDCP_KEY_LSB(x) (DP_HDCP_KEY_MSB(x) + 4)
> +#define DP_HDCP_KEY_VALID 0x170
> +#define DP_HDCP_SW_KEY_VALID BIT(0)
> +
> +/* Timeouts */
> +#define DP_KEYS_VALID_SLEEP_US (20 * 1000)
> +#define DP_KEYS_VALID_TIMEOUT_US (100 * 1000)
> +#define DP_AN_READY_SLEEP_US 100
> +#define DP_AN_READY_TIMEOUT_US (10 * 1000)
> +#define DP_R0_READY_SLEEP_US 100
> +#define DP_R0_READY_TIMEOUT_US (10 * 1000)
> +#define DP_RI_MATCH_SLEEP_US (20 * 1000)
> +#define DP_RI_MATCH_TIMEOUT_US (100 * 1000)
> +#define DP_KSV_WRITTEN_SLEEP_US 100
> +#define DP_KSV_WRITTEN_TIMEOUT_US (100 * 1000)
> +#define DP_SHA_COMPUTATION_SLEEP_US 100
> +#define DP_SHA_COMPUTATION_TIMEOUT_US (100 * 1000)
> +#define DP_AN_READ_DELAY_US 1
> +
> +/*
> + * dp_hdcp_key - structure which contains an HDCP key set
> + * @ksv: The key selection vector
> + * @keys: Contains 40 keys
> + */
> +struct dp_hdcp_key {
> + struct drm_hdcp_ksv ksv;
> + union {
> + u32 words[2];
> + u8 bytes[DP_HDCP_KEY_LEN];
> + } keys[DP_HDCP_NUM_KEYS];
> + bool valid;
> +};
> +
> +struct dp_hdcp {
> + struct drm_device *dev;
> + struct drm_connector *connector;
> +
> + struct drm_dp_aux *aux;
> + struct dp_parser *parser;
> +
> + struct drm_hdcp_helper_data *helper_data;
> +
> + struct mutex key_lock;
> + struct dp_hdcp_key key;
> +};
> +
> +static inline void dp_hdcp_write_ahb(struct dp_hdcp *hdcp, u32 offset, u32 val)
> +{
> + writel(val, hdcp->parser->io.dp_controller.ahb.base + offset);
> +}
> +
> +static inline u32 dp_hdcp_read_ahb(struct dp_hdcp *hdcp, u32 offset)
> +{
> + return readl(hdcp->parser->io.dp_controller.ahb.base + offset);
> +}
> +
> +static inline void dp_hdcp_write_aux(struct dp_hdcp *hdcp, u32 offset, u32 val)
> +{
> + writel(val, hdcp->parser->io.dp_controller.aux.base + offset);
> +}
> +
> +static inline u32 dp_hdcp_read_aux(struct dp_hdcp *hdcp, u32 offset)
> +{
> + return readl(hdcp->parser->io.dp_controller.aux.base + offset);
> +}
> +
> +static inline void dp_hdcp_write_link(struct dp_hdcp *hdcp, u32 offset, u32 val)
> +{
> + writel(val, hdcp->parser->io.dp_controller.link.base + offset);
> +}
> +
> +static inline u32 dp_hdcp_read_link(struct dp_hdcp *hdcp, u32 offset)
> +{
> + return readl(hdcp->parser->io.dp_controller.link.base + offset);
> +}
> +
> +static inline void dp_hdcp_write_key(struct dp_hdcp *hdcp, u32 offset, u32 val)
> +{
> + writel(val, hdcp->parser->io.dp_controller.hdcp_key.base + offset);
> +}
> +
> +static inline void dp_hdcp_write_tz_hlos(struct dp_hdcp *hdcp, u32 offset,
> + u32 val)
> +{
> + writel(val, hdcp->parser->io.dp_controller.hdcp_tz.base + offset);
> +}
Please use existing helpers from dp_catalog.c Add new helpers close to
the existing ones.
> +
> +int dp_hdcp_ingest_key(struct dp_hdcp *hdcp, const u8 *raw_key, int raw_len)
> +{
> + unsigned int ksv_weight;
> + int i, ret = 0;
> +
> + if (raw_len !=
> + (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN)) {
You can calculate the len and assign it to the temp variable. Helps
with both indentation and duplication.
> + DRM_ERROR(
> + "Invalid HDCP key length expected=%d actual=%d\n",
> + (DRM_HDCP_KSV_LEN + DP_HDCP_NUM_KEYS * DP_HDCP_KEY_LEN),
> + raw_len);
> + return -EINVAL;
> + }
> +
> + mutex_lock(&hdcp->key_lock);
> +
> + memcpy(hdcp->key.ksv.bytes, raw_key, DRM_HDCP_KSV_LEN);
> + ksv_weight = hweight32(hdcp->key.ksv.words[0]) +
> + hweight32(hdcp->key.ksv.words[1]);
> + if (ksv_weight != 20) {
> + DRM_ERROR("Invalid ksv weight, expected=20 actual=%d\n",
> + ksv_weight);
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + raw_key += DRM_HDCP_KSV_LEN;
> + for (i = 0; i < DP_HDCP_NUM_KEYS; i++) {
> + memcpy(hdcp->key.keys[i].bytes, raw_key, DP_HDCP_KEY_LEN);
> + raw_key += DP_HDCP_KEY_LEN;
> + }
> +
> + DRM_DEBUG_DRIVER("Successfully ingested HDCP key\n");
> + hdcp->key.valid = true;
> +
> +out:
> + mutex_unlock(&hdcp->key_lock);
> + return ret;
> +}
> +
> +static bool dp_hdcp_are_keys_valid(struct drm_connector *connector,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + u32 val;
> +
> + val = dp_hdcp_read_ahb(hdcp, DP_HDCP_STATUS);
> + return FIELD_GET(DP_HDCP_KEY_STATUS, val) == DP_HDCP_KEY_STATUS_VALID;
> +}
> +
> +static int dp_hdcp_load_keys(struct drm_connector *connector, void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + int i, ret = 0;
> + u64 an_seed = get_random_u64();
> +
> + mutex_lock(&hdcp->key_lock);
> +
> + if (!hdcp->key.valid) {
> + ret = -ENOENT;
> + goto out;
> + }
> +
> + dp_hdcp_write_aux(hdcp, DP_HDCP_SW_LOWER_AKSV, hdcp->key.ksv.words[0]);
> + dp_hdcp_write_aux(hdcp, DP_HDCP_SW_UPPER_AKSV, hdcp->key.ksv.words[1]);
> +
> + for (i = 0; i < DP_HDCP_NUM_KEYS; i++) {
> + dp_hdcp_write_key(hdcp, DP_HDCP_KEY_LSB(i),
> + hdcp->key.keys[i].words[0]);
> + dp_hdcp_write_key(hdcp, DP_HDCP_KEY_MSB(i),
> + hdcp->key.keys[i].words[1]);
> + }
> +
> + dp_hdcp_write_key(hdcp, DP_HDCP_KEY_VALID, DP_HDCP_SW_KEY_VALID);
> +
> + dp_hdcp_write_link(hdcp, DP_HDCP_ENTROPY_CTRL0,
> + FIELD_GET(GENMASK(31, 0), an_seed));
> + dp_hdcp_write_link(hdcp, DP_HDCP_ENTROPY_CTRL1,
> + FIELD_GET(GENMASK_ULL(63, 32), an_seed));
> +
> +out:
> + mutex_unlock(&hdcp->key_lock);
> + return ret;
> +}
> +
> +static int dp_hdcp_hdcp2_capable(struct drm_connector *connector, bool *capable,
> + void *driver_data)
> +{
> + *capable = false;
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_read_an_aksv(struct drm_connector *connector, u32 *an,
> + u32 *aksv, void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + bool keys_valid;
> + int ret;
> + u32 val;
> +
> + dp_hdcp_write_ahb(hdcp, DP_HDCP_CTRL, 1);
> +
> + ret = read_poll_timeout(dp_hdcp_are_keys_valid, keys_valid, keys_valid,
> + DP_KEYS_VALID_SLEEP_US,
> + DP_KEYS_VALID_TIMEOUT_US, false, connector,
> + driver_data);
> + if (ret) {
> + drm_err(hdcp->dev, "HDCP keys invalid %d\n", ret);
> + return ret;
> + }
> +
> + /* Clear AInfo */
> + dp_hdcp_write_aux(hdcp, DP_HDCP_RCVPORT_DATA4, 0);
> +
> + aksv[0] = dp_hdcp_read_aux(hdcp, DP_HDCP_RCVPORT_DATA3);
> + aksv[1] = GENMASK(7, 0) & dp_hdcp_read_aux(hdcp, DP_HDCP_RCVPORT_DATA4);
> +
> + ret = read_poll_timeout(dp_hdcp_read_ahb, val,
> + (val & DP_HDCP_AN_READY_MASK) ==
> + DP_HDCP_AN_READY_MASK,
> + DP_AN_READY_SLEEP_US, DP_AN_READY_TIMEOUT_US,
> + false, hdcp, DP_HDCP_STATUS);
> + if (ret) {
> + drm_err(hdcp->dev, "AN failed to become ready %x/%d\n", val,
> + ret);
> + return ret;
> + }
> +
> + /*
> + * Get An from hardware, for unknown reasons we need to read the reg
> + * twice to get valid data.
> + */
> + dp_hdcp_read_ahb(hdcp, DP_HDCP_RCVPORT_DATA5);
> + an[0] = dp_hdcp_read_ahb(hdcp, DP_HDCP_RCVPORT_DATA5);
> +
> + udelay(DP_AN_READ_DELAY_US);
> +
> + dp_hdcp_read_ahb(hdcp, DP_HDCP_RCVPORT_DATA6);
> + an[1] = dp_hdcp_read_ahb(hdcp, DP_HDCP_RCVPORT_DATA6);
> +
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_store_receiver_info(struct drm_connector *connector,
> + u32 *ksv, u32 status, u8 bcaps,
> + bool is_repeater,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + u32 val;
> +
> + dp_hdcp_write_tz_hlos(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA0,
> + ksv[0]);
> + dp_hdcp_write_tz_hlos(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA1,
> + ksv[1]);
> +
> + val = FIELD_PREP(GENMASK(23, 8), status) |
> + FIELD_PREP(GENMASK(7, 0), bcaps);
> +
> + dp_hdcp_write_tz_hlos(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA12,
> + val);
> +
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_enable_encryption(struct drm_connector *connector,
> + void *driver_data)
> +{
> + return 0;
> +}
This raises a lot of questions. Please add the comment why this
function is empty
> +
> +static int dp_hdcp_hdcp1_wait_for_r0(struct drm_connector *connector,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + int ret;
> + u32 val;
> +
> + ret = read_poll_timeout(dp_hdcp_read_ahb, val, (val & DP_HDCP_R0_READY),
> + DP_R0_READY_SLEEP_US, DP_R0_READY_TIMEOUT_US,
> + false, hdcp, DP_HDCP_STATUS);
> + if (ret) {
> + drm_err(hdcp->dev, "HDCP R0 not ready %x/%d\n", val, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_match_ri(struct drm_connector *connector, u32 ri_prime,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + int ret;
> + u32 val;
> +
> + dp_hdcp_write_ahb(hdcp, DP_HDCP_RCVPORT_DATA2_0, ri_prime);
> +
> + ret = read_poll_timeout(dp_hdcp_read_ahb, val, (val & DP_HDCP_RI_MATCH),
> + DP_RI_MATCH_SLEEP_US, DP_RI_MATCH_TIMEOUT_US,
> + false, hdcp, DP_HDCP_STATUS);
> + if (ret) {
> + drm_err(hdcp->dev,
> + "Failed to match Ri and Ri` (%08x) %08x/%d\n", ri_prime,
> + val, ret);
> + return ret;
> + }
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_store_ksv_fifo(struct drm_connector *connector,
> + u8 *ksv_fifo, u8 num_downstream,
> + u8 *bstatus, u32 *vprime,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + int num_bytes = num_downstream * DRM_HDCP_KSV_LEN;
> + int ret, i;
> + u32 val;
> +
> + /* Reset the SHA computation block */
> + dp_hdcp_write_tz_hlos(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_CTRL,
> + DP_HDCP_SHA_CTRL_RESET);
> + dp_hdcp_write_tz_hlos(hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_CTRL, 0);
> +
> + /*
> + * KSV info gets written a byte at a time in the same order it was
> + * received. Every 64 bytes, we need to wait for the SHA_BLOCK_DONE
> + * bit to be set in SHA_CTRL.
> + */
> + for (i = 0; i < num_bytes; i++) {
> + val = FIELD_PREP(DP_HDCP_SHA_DATA_MASK, ksv_fifo[i]);
> +
> + if (i == (num_bytes - 1))
> + val |= DP_HDCP_SHA_DATA_DONE;
> +
> + dp_hdcp_write_tz_hlos(
> + hdcp, HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_DATA, val);
> +
> + if (((i + 1) % 64) != 0)
Please remove unused parentheses.
> + continue;
> +
> + ret = read_poll_timeout(dp_hdcp_read_ahb, val,
> + (val & DP_HDCP_SHA_DONE),
> + DP_KSV_WRITTEN_SLEEP_US,
> + DP_KSV_WRITTEN_TIMEOUT_US, false, hdcp,
> + DP_HDCP_SHA_STATUS);
> + if (ret) {
> + drm_err(hdcp->dev, "SHA block incomplete %d\n", ret);
> + return ret;
> + }
> + }
> +
> + ret = read_poll_timeout(dp_hdcp_read_ahb, val,
> + (val & DP_HDCP_SHA_COMP_DONE),
> + DP_SHA_COMPUTATION_SLEEP_US,
> + DP_SHA_COMPUTATION_TIMEOUT_US, false, hdcp,
> + DP_HDCP_SHA_STATUS);
> + if (ret) {
> + drm_err(hdcp->dev, "SHA computation incomplete %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int dp_hdcp_hdcp1_disable(struct drm_connector *connector,
> + void *driver_data)
> +{
> + struct drm_bridge *bridge = (struct drm_bridge *)driver_data;
> + struct dp_hdcp *hdcp = dp_display_bridge_to_hdcp(bridge);
> + u32 val;
> +
> + val = dp_hdcp_read_ahb(hdcp, REG_DP_SW_RESET);
> + dp_hdcp_write_ahb(hdcp, REG_DP_SW_RESET, val | DP_HDCP_SW_RESET);
> +
> + /* Disable encryption and disable the HDCP block */
> + dp_hdcp_write_ahb(hdcp, DP_HDCP_CTRL, 0);
> +
> + dp_hdcp_write_ahb(hdcp, REG_DP_SW_RESET, val);
> +
> + return 0;
> +}
> +
> +void dp_hdcp_commit(struct dp_hdcp *hdcp, struct drm_atomic_state *state)
> +{
> + drm_hdcp_helper_atomic_commit(hdcp->helper_data, state, NULL);
> +}
> +
> +static const struct drm_hdcp_helper_funcs dp_hdcp_funcs = {
> + .are_keys_valid = dp_hdcp_are_keys_valid,
> + .load_keys = dp_hdcp_load_keys,
> + .hdcp2_capable = dp_hdcp_hdcp2_capable,
> + .hdcp1_read_an_aksv = dp_hdcp_hdcp1_read_an_aksv,
> + .hdcp1_store_receiver_info = dp_hdcp_hdcp1_store_receiver_info,
> + .hdcp1_enable_encryption = dp_hdcp_hdcp1_enable_encryption,
> + .hdcp1_wait_for_r0 = dp_hdcp_hdcp1_wait_for_r0,
> + .hdcp1_match_ri = dp_hdcp_hdcp1_match_ri,
> + .hdcp1_store_ksv_fifo = dp_hdcp_hdcp1_store_ksv_fifo,
> + .hdcp1_disable = dp_hdcp_hdcp1_disable,
> + /* Common DRM functions that are different between DP vs HDMI*/
> + .remote_read = drm_hdcp_remote_dpcd_read,
> + .remote_write = drm_hdcp_remote_dpcd_write,
> + .hdcp1_capable = drm_hdcp_helper_hdcp1_capable_dp,
> + .hdcp1_ksv_fifo_ready = drm_hdcp_helper_hdcp1_ksv_fifo_ready_dp,
> + .wait_r0 = drm_hdcp_helper_wait_r0_dp,
> + .hdcp1_check_link_registers = drm_hdcp_hdcp1_check_link_registers_dp,
> + .hdcp1_read_ksv_fifo = drm_hdcp_helper_hdcp1_read_ksv_fifo_dp
> +};
> +
> +int dp_hdcp_attach(struct dp_hdcp *hdcp, struct drm_connector *connector,
> + struct drm_bridge *bridge)
> +{
> + struct drm_hdcp_helper_data *helper_data;
> +
> + /* HDCP is not configured for this device */
> + if (!hdcp->parser->io.dp_controller.hdcp_key.base)
> + return 0;
> +
> + helper_data = drm_hdcp_helper_initialize_dp(connector, hdcp->aux,
> + &dp_hdcp_funcs, false);
> + if (IS_ERR(helper_data))
> + return PTR_ERR(helper_data);
> +
> + helper_data->driver_data = bridge;
> + hdcp->dev = connector->dev;
> + hdcp->connector = connector;
> + hdcp->helper_data = helper_data;
> +
> + return 0;
> +}
> +
> +struct dp_hdcp *dp_hdcp_get(struct dp_parser *parser, struct drm_dp_aux *aux)
> +{
> + struct device *dev = &parser->pdev->dev;
> + struct dp_hdcp *hdcp;
> +
> + hdcp = devm_kzalloc(dev, sizeof(*hdcp), GFP_KERNEL);
> + if (!hdcp)
> + return ERR_PTR(-ENOMEM);
> +
> + hdcp->parser = parser;
> + hdcp->aux = aux;
> +
> + mutex_init(&hdcp->key_lock);
> +
> + return hdcp;
> +}
> +
> +void dp_hdcp_put(struct dp_hdcp *hdcp)
> +{
> + if (hdcp)
> + drm_hdcp_helper_destroy(hdcp->helper_data);
> +}
> \ No newline at end of file
This should be fixed
> diff --git a/drivers/gpu/drm/msm/dp/dp_hdcp.h b/drivers/gpu/drm/msm/dp/dp_hdcp.h
> new file mode 100644
> index 0000000000000..f6e3cb87b7055
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/dp/dp_hdcp.h
> @@ -0,0 +1,31 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright (C) 2021 Google, Inc.
> + *
> + * Authors:
> + * Sean Paul <seanpaul@...omium.org>
> + */
> +
> +#ifndef DP_HDCP_H_
> +#define DP_HDCP_H_
> +
> +#include <drm/display/drm_hdcp_helper.h>
> +#include <drm/drm_bridge.h>
> +
> +#define DP_HDCP_KEY_LEN 7
> +#define DP_HDCP_NUM_KEYS 40
> +
> +struct dp_hdcp;
> +struct dp_parser;
> +struct drm_atomic_state;
> +struct drm_dp_aux;
> +
> +struct dp_hdcp *dp_hdcp_get(struct dp_parser *parser, struct drm_dp_aux *aux);
> +void dp_hdcp_put(struct dp_hdcp *hdcp);
> +
> +int dp_hdcp_attach(struct dp_hdcp *hdcp, struct drm_connector *connector,
> + struct drm_bridge *bridge);
> +int dp_hdcp_ingest_key(struct dp_hdcp *hdcp, const u8 *raw_key, int raw_len);
> +void dp_hdcp_commit(struct dp_hdcp *hdcp, struct drm_atomic_state *state);
> +
> +#endif // DRIVERS_GPU_DRM_MSM_DP_DP_HDCP_H_
no, the guard name differs
> \ No newline at end of file
This should be fixed
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
> index 7032dcc8842b3..12650b599141f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> @@ -66,6 +66,10 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
> dss->link.len = DP_DEFAULT_LINK_SIZE;
> dss->p0.base = dss->ahb.base + DP_DEFAULT_P0_OFFSET;
> dss->p0.len = DP_DEFAULT_P0_SIZE;
> + dss->hdcp_key.base = NULL;
> + dss->hdcp_key.len = 0;
> + dss->hdcp_tz.base = NULL;
> + dss->hdcp_tz.len = 0;
Is there a need to initialize to default values?
> } else {
> DRM_ERROR("unable to remap aux region: %pe\n", dss->aux.base);
> return PTR_ERR(dss->aux.base);
> @@ -84,6 +88,21 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
> }
> }
>
> + dss->hdcp_key.base = dp_ioremap(pdev, 5, &dss->hdcp_key.len);
You can use the temp variable here. It will allow you to drop the
whole else chunk
> + if (!IS_ERR(dss->hdcp_key.base)) {
> + dss->hdcp_tz.base = dp_ioremap(pdev, 6, &dss->hdcp_tz.len);
> + if (IS_ERR(dss->hdcp_tz.base)) {
> + DRM_ERROR("unable to remap hdcp_tz region: %pe\n",
> + dss->hdcp_tz.base);
> + return PTR_ERR(dss->hdcp_tz.base);
> + }
> + } else {
> + dss->hdcp_key.base = NULL;
> + dss->hdcp_key.len = 0;
> + dss->hdcp_tz.base = NULL;
> + dss->hdcp_tz.len = 0;
> + }
> +
> io->phy = devm_phy_get(&pdev->dev, "dp");
> if (IS_ERR(io->phy))
> return PTR_ERR(io->phy);
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h
> index 1f068626d445e..8b5dd3deb85ff 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.h
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.h
> @@ -35,6 +35,8 @@ struct dss_io_data {
> struct dss_io_region aux;
> struct dss_io_region link;
> struct dss_io_region p0;
> + struct dss_io_region hdcp_key;
> + struct dss_io_region hdcp_tz;
> };
>
> static inline const char *dp_parser_pm_name(enum dp_pm_type module)
> @@ -69,6 +71,8 @@ struct dp_display_data {
> * struct dp_ctrl_resource - controller's IO related data
> *
> * @dp_controller: Display Port controller mapped memory address
> + * @hdcp_key: mapped memory for HDCP key ingestion
> + * @hdcp_tz: mapped memory for HDCP TZ interaction
> * @phy_io: phy's mapped memory address
> */
> struct dp_io {
> diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
> index 268602803d9a3..d2ac60ce7ae50 100644
> --- a/drivers/gpu/drm/msm/dp/dp_reg.h
> +++ b/drivers/gpu/drm/msm/dp/dp_reg.h
> @@ -10,7 +10,8 @@
> #define REG_DP_HW_VERSION (0x00000000)
>
> #define REG_DP_SW_RESET (0x00000010)
> -#define DP_SW_RESET (0x00000001)
> +#define DP_SW_RESET BIT(0)
> +#define DP_HDCP_SW_RESET BIT(1)
>
> #define REG_DP_PHY_CTRL (0x00000014)
> #define DP_PHY_CTRL_SW_RESET_PLL (0x00000001)
> @@ -283,19 +284,46 @@
> /* DP HDCP 1.3 registers */
> #define DP_HDCP_CTRL (0x0A0)
> #define DP_HDCP_STATUS (0x0A4)
> +#define DP_HDCP_KEY_STATUS GENMASK(18, 16)
> +#define DP_HDCP_KEY_STATUS_NO_KEYS 0
> +#define DP_HDCP_KEY_STATUS_NOT_CHECKED 1
> +#define DP_HDCP_KEY_STATUS_CHECKING 2
> +#define DP_HDCP_KEY_STATUS_VALID 3
> +#define DP_HDCP_KEY_STATUS_INVALID_AKSV 4
> +#define DP_HDCP_KEY_STATUS_BAD_CHECKSUM 5
> +#define DP_HDCP_KEY_STATUS_PROD_AKSV 6
> +#define DP_HDCP_KEY_STATUS_RESV 7
> +#define DP_HDCP_R0_READY BIT(14)
> +#define DP_HDCP_SHA_V_MATCH BIT(13)
> +#define DP_HDCP_RI_MATCH BIT(12)
> +#define DP_HDCP_AN_MSB_READY BIT(9)
> +#define DP_HDCP_AN_LSB_READY BIT(8)
> +#define DP_HDCP_AN_READY_MASK (DP_HDCP_AN_MSB_READY | DP_HDCP_AN_LSB_READY)
> +#define DP_HDCP_AUTH_FAIL_INFO GENMASK(7, 4)
> +#define DP_HDCP_AUTH_FAIL_INVALID_AKSV 3
> +#define DP_HDCP_AUTH_FAIL_INVALID_BKSV 4
> +#define DP_HDCP_AUTH_FAIL_RI_MISMATCH 5
> +#define DP_HDCP_AUTH_FAIL BIT(2)
> +#define DP_HDCP_AUTH_SUCCESS BIT(0)
> #define DP_HDCP_SW_UPPER_AKSV (0x098)
> #define DP_HDCP_SW_LOWER_AKSV (0x09C)
> #define DP_HDCP_ENTROPY_CTRL0 (0x350)
> #define DP_HDCP_ENTROPY_CTRL1 (0x35C)
> #define DP_HDCP_SHA_STATUS (0x0C8)
> +#define DP_HDCP_SHA_COMP_DONE BIT(4)
> +#define DP_HDCP_SHA_DONE BIT(0)
> #define DP_HDCP_RCVPORT_DATA2_0 (0x0B0)
> #define DP_HDCP_RCVPORT_DATA3 (0x0A4)
> #define DP_HDCP_RCVPORT_DATA4 (0x0A8)
> #define DP_HDCP_RCVPORT_DATA5 (0x0C0)
> #define DP_HDCP_RCVPORT_DATA6 (0x0C4)
> +#define DP_HDCP_RCVPORT_DATA7 (0x0C8)
>
> #define HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_CTRL (0x024)
> +#define DP_HDCP_SHA_CTRL_RESET BIT(0)
> #define HDCP_SEC_DP_TZ_HV_HLOS_HDCP_SHA_DATA (0x028)
> +#define DP_HDCP_SHA_DATA_MASK GENMASK(23, 16)
> +#define DP_HDCP_SHA_DATA_DONE BIT(0)
> #define HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA0 (0x004)
> #define HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA1 (0x008)
> #define HDCP_SEC_DP_TZ_HV_HLOS_HDCP_RCVPORT_DATA7 (0x00C)
> diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> index 1686fbb611fd7..82cfbfbae83e7 100644
> --- a/drivers/gpu/drm/msm/msm_atomic.c
> +++ b/drivers/gpu/drm/msm/msm_atomic.c
> @@ -4,9 +4,12 @@
> * Author: Rob Clark <robdclark@...il.com>
> */
>
> +#include "drm/drm_bridge.h"
> +#include "drm/drm_device.h"
Wrong quotes. Also please use some sorting order: either add new
includes to the end, or use the alphabetic sort.
> #include <drm/drm_atomic_uapi.h>
> #include <drm/drm_vblank.h>
>
> +#include "dp/dp_drm.h"
> #include "msm_atomic_trace.h"
> #include "msm_drv.h"
> #include "msm_gem.h"
> @@ -179,6 +182,20 @@ static unsigned get_crtc_mask(struct drm_atomic_state *state)
> return mask;
> }
>
> +static void msm_atomic_commit_connectors(struct drm_atomic_state *state)
> +{
> + struct drm_device *dev = state->dev;
> + struct msm_drm_private *priv = dev->dev_private;
> + int i;
> +
> + for (i = 0; i < priv->num_bridges; ++i) {
> + struct drm_bridge *bridge = priv->bridges[i];
> + if (dp_drm_is_bridge_msm_dp(bridge)) {
> + dp_drm_atomic_commit(bridge, state);
> + }
No. First, this relies on the fact that only DP bridges need
additional handling here. Second, there might be other parties
involved in the HDCP setup. Think about DSI-to-HDMI or -to-DP bridges.
Or about the HDCP being optionally supported for eDP.
Is there any reason why we can handle HDCP from bridge's
atomic_enable() callback?
> + }
> +}
> +
> void msm_atomic_commit_tail(struct drm_atomic_state *state)
> {
> struct drm_device *dev = state->dev;
> @@ -215,6 +232,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
> drm_atomic_helper_commit_planes(dev, state, 0);
> drm_atomic_helper_commit_modeset_enables(dev, state);
>
> + msm_atomic_commit_connectors(state);
> +
> if (async) {
> struct msm_pending_timer *timer =
> &kms->pending_timers[drm_crtc_index(async_crtc)];
> --
> 2.40.0.348.gf938b09366-goog
>
--
With best wishes
Dmitry
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