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Message-ID: <4q2jncpnmeu7ytuyuv5pjzurh3ai5663jmu2we6cebuad2r3r5@tfb6hf6unioc>
Date: Fri, 13 Dec 2024 12:46:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Xin Ji <xji@...logixsemi.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>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Bernie Liang <bliang@...logixsemi.com>, Qilin Wen <qwen@...logixsemi.com>,
"treapking@...gle.com" <treapking@...gle.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] drm/bridge:anx7625: Update HDCP status at
atomic_enable()
On Fri, Dec 13, 2024 at 10:06:36AM +0000, Xin Ji wrote:
> Hi Dmitry, thanks for the review, I made some changes which change ENABLE to DESIRE
> in .atomic_disable(), I'll upstream it after testing. Thanks!
- Please don't top-post.
- You still didn't explain, why do you want to do this change of HDCP
status. Could you please provide an explanation before sending the
next iteration?
>
> > -----Original Message-----
> > From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > Sent: Thursday, December 12, 2024 5:18 PM
> > To: Xin Ji <xji@...logixsemi.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>; Maarten Lankhorst
> > <maarten.lankhorst@...ux.intel.com>; Maxime Ripard <mripard@...nel.org>;
> > Thomas Zimmermann <tzimmermann@...e.de>; David Airlie
> > <airlied@...il.com>; Simona Vetter <simona@...ll.ch>; Bernie Liang
> > <bliang@...logixsemi.com>; Qilin Wen <qwen@...logixsemi.com>;
> > treapking@...gle.com; dri-devel@...ts.freedesktop.org; linux-
> > kernel@...r.kernel.org
> > Subject: Re: [PATCH v3] drm/bridge:anx7625: Update HDCP status at
> > atomic_enable()
> >
> > CAUTION: This email originated from outside of the organization. Please do not
> > click links or open attachments unless you recognize the sender, and know the
> > content is safe.
> >
> >
> > On Thu, Dec 12, 2024 at 01:51:10PM +0800, Xin Ji wrote:
> > > When user enabled HDCP feature, userspace will set HDCP content to
> > > DRM_MODE_CONTENT_PROTECTION_DESIRED. Next, anx7625 will update
> > HDCP
> > > content to DRM_MODE_CONTENT_PROTECTION_ENABLED if down stream
> > support
> > > HDCP feature.
> > >
> > > However once HDCP content turn to
> > DRM_MODE_CONTENT_PROTECTION_ENABLED
> > > userspace will not update the HDCP content to
> > > DRM_MODE_CONTENT_PROTECTION_UNDESIRED until monitor disconnect.
> >
> > It seems you've ingored a part of the previous review comment. It's the
> > userspace who triggers the ENABLED -> UNDESIRED transition, not the kernel
> > side. The change to move HDCP handling to atomic_enable() looks fine, the
> > change to disable HDCP is not (unless I misunderstand something).
> >
> > >
> > > So, anx7625 driver move hdcp content value checking from bridge
> > > interface .atomic_check() to .atomic_enable(), then update hdcp
> > > content according from currently HDCP status. And also disabled HDCP
> > > in bridge interface .atomic_disable().
> > >
> > > Signed-off-by: Xin Ji <xji@...logixsemi.com>
> > > ---
> > > drivers/gpu/drm/bridge/analogix/anx7625.c | 74
> > > ++++++++++++++---------
> > > 1 file changed, 46 insertions(+), 28 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > index a2675b121fe4..f96ce5665e8d 100644
> > > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > @@ -861,6 +861,22 @@ static int anx7625_hdcp_disable(struct anx7625_data
> > *ctx)
> > > TX_HDCP_CTRL0, ~HARD_AUTH_EN & 0xFF);
> > > }
> > >
> > > +static void anx7625_hdcp_disable_and_update_cp(struct anx7625_data
> > > +*ctx) {
> > > + struct device *dev = ctx->dev;
> > > +
> > > + if (!ctx->connector)
> > > + return;
> > > +
> > > + anx7625_hdcp_disable(ctx);
> > > +
> > > + ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
> > > + drm_hdcp_update_content_protection(ctx->connector,
> > > + ctx->hdcp_cp);
> > > +
> > > + dev_dbg(dev, "update CP to UNDESIRE\n"); }
> > > +
> > > static int anx7625_hdcp_enable(struct anx7625_data *ctx) {
> > > u8 bcap;
> > > @@ -2149,34 +2165,6 @@ static int anx7625_connector_atomic_check(struct
> > anx7625_data *ctx,
> > > if (cp == ctx->hdcp_cp)
> > > return 0;
> > >
> > > - if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
> > > - if (ctx->dp_en) {
> > > - dev_dbg(dev, "enable HDCP\n");
> > > - anx7625_hdcp_enable(ctx);
> > > -
> > > - queue_delayed_work(ctx->hdcp_workqueue,
> > > - &ctx->hdcp_work,
> > > - msecs_to_jiffies(2000));
> > > - }
> > > - }
> > > -
> > > - if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
> > > - if (ctx->hdcp_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED) {
> > > - dev_err(dev, "current CP is not ENABLED\n");
> > > - return -EINVAL;
> > > - }
> > > - anx7625_hdcp_disable(ctx);
> > > - ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
> > > - drm_hdcp_update_content_protection(ctx->connector,
> > > - ctx->hdcp_cp);
> > > - dev_dbg(dev, "update CP to UNDESIRE\n");
> > > - }
> > > -
> > > - if (cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
> > > - dev_err(dev, "Userspace illegal set to PROTECTION ENABLE\n");
> > > - return -EINVAL;
> > > - }
> > > -
> > > return 0;
> > > }
> > >
> > > @@ -2425,6 +2413,8 @@ static void anx7625_bridge_atomic_enable(struct
> > drm_bridge *bridge,
> > > struct anx7625_data *ctx = bridge_to_anx7625(bridge);
> > > struct device *dev = ctx->dev;
> > > struct drm_connector *connector;
> > > + struct drm_connector_state *conn_state;
> > > + int cp;
> > >
> > > dev_dbg(dev, "drm atomic enable\n");
> > >
> > > @@ -2439,6 +2429,32 @@ static void anx7625_bridge_atomic_enable(struct
> > drm_bridge *bridge,
> > > _anx7625_hpd_polling(ctx, 5000 * 100);
> > >
> > > anx7625_dp_start(ctx);
> > > +
> > > + conn_state =
> > > + drm_atomic_get_new_connector_state(state->base.state, connector);
> > > +
> > > + if (WARN_ON(!conn_state))
> > > + return;
> > > +
> > > + cp = conn_state->content_protection;
> > > + if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
> > > + if (ctx->dp_en) {
> > > + dev_dbg(dev, "enable HDCP\n");
> > > + anx7625_hdcp_enable(ctx);
> > > +
> > > + queue_delayed_work(ctx->hdcp_workqueue,
> > > + &ctx->hdcp_work,
> > > + msecs_to_jiffies(2000));
> > > + }
> > > + }
> > > +
> > > + if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
> > > + if (ctx->hdcp_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED) {
> > > + dev_err(dev, "current CP is not ENABLED\n");
> > > + return;
> > > + }
> > > +
> > > + anx7625_hdcp_disable_and_update_cp(ctx);
> > > + }
> > > }
> > >
> > > static void anx7625_bridge_atomic_disable(struct drm_bridge *bridge,
> > > @@ -2449,6 +2465,8 @@ static void anx7625_bridge_atomic_disable(struct
> > > drm_bridge *bridge,
> > >
> > > dev_dbg(dev, "drm atomic disable\n");
> > >
> > > + anx7625_hdcp_disable_and_update_cp(ctx);
> > > +
> > > ctx->connector = NULL;
> > > anx7625_dp_stop(ctx);
> > >
> > > --
> > > 2.25.1
> > >
> >
> > --
> > With best wishes
> > Dmitry
--
With best wishes
Dmitry
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