linux-kernel - Re: [PATCH] drm/bridge: cdns-dsi: Add support for pre_enable and post

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Message-ID: <CAG3jFytUcN5844DnJgb-ee5pcetoWqzsByosMPfT7YMUvs4M8w@mail.gmail.com>
Date:   Wed, 11 May 2022 14:30:06 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Jayshri Pawar <jpawar@...ence.com>
Cc:     dri-devel@...ts.freedesktop.org, daniel@...ll.ch, airlied@...ux.ie,
        andrzej.hajda@...el.com, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...il.com, linux-kernel@...r.kernel.org,
        mparab@...ence.com, sjakhade@...ence.com, nm@...com,
        yogeshs@...com, kishon@...com
Subject: Re: [PATCH] drm/bridge: cdns-dsi: Add support for pre_enable and
 post_enable control functions.

On Mon, 11 Apr 2022 at 16:07, Jayshri Pawar <jpawar@...ence.com> wrote:
>
> From: jpawar <jpawar@...ence.com>

This should be "Jayshri Pawar <jpawar@...ence.com>"

>
> Add support for pre_enable and post_enable drm bridge control functions.
> Making sure that host to be prepared before panel is powered up,
> for the panels like TC358762.
>
> Signed-off-by: jpawar <jpawar@...ence.com>

Again, your full name should be used.

> ---
>  drivers/gpu/drm/bridge/cdns-dsi.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
> index 829e1a144656..20bece84ff8c 100644
> --- a/drivers/gpu/drm/bridge/cdns-dsi.c
> +++ b/drivers/gpu/drm/bridge/cdns-dsi.c
> @@ -462,6 +462,7 @@ struct cdns_dsi {
>         struct reset_control *dsi_p_rst;
>         struct clk *dsi_sys_clk;
>         bool link_initialized;
> +       bool phy_initialized;
>         struct phy *dphy;
>  };
>
> @@ -711,11 +712,21 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
>         pm_runtime_put(dsi->base.dev);
>  }
>
> +static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
> +{
> +       struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +       struct cdns_dsi *dsi = input_to_dsi(input);
> +
> +       pm_runtime_put(dsi->base.dev);
> +}
> +
>  static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
>  {
>         struct cdns_dsi_output *output = &dsi->output;
>         u32 status;
>
> +       if (dsi->phy_initialized)
> +               return;
>         /*
>          * Power all internal DPHY blocks down and maintain their reset line
>          * asserted before changing the DPHY config.
> @@ -739,6 +750,7 @@ static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
>         writel(DPHY_CMN_PSO | DPHY_ALL_D_PDN | DPHY_C_PDN | DPHY_CMN_PDN |
>                DPHY_D_RSTB(output->dev->lanes) | DPHY_C_RSTB,
>                dsi->regs + MCTL_DPHY_CFG0);
> +       dsi->phy_initialized = true;
>  }
>
>  static void cdns_dsi_init_link(struct cdns_dsi *dsi)
> @@ -914,11 +926,25 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
>         writel(tmp, dsi->regs + MCTL_MAIN_EN);
>  }
>
> +static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +       struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> +       struct cdns_dsi *dsi = input_to_dsi(input);
> +
> +       if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
> +               return;
> +
> +       cdns_dsi_init_link(dsi);
> +       cdns_dsi_hs_init(dsi);
> +}
> +
>  static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
>         .attach = cdns_dsi_bridge_attach,
>         .mode_valid = cdns_dsi_bridge_mode_valid,
>         .disable = cdns_dsi_bridge_disable,
> +       .pre_enable = cdns_dsi_bridge_pre_enable,
>         .enable = cdns_dsi_bridge_enable,
> +       .post_disable = cdns_dsi_bridge_post_disable,
>  };
>
>  static int cdns_dsi_attach(struct mipi_dsi_host *host,

Cadence seems to have DKIM mail server failure, which is preventing b4
from importing this patch. Log attached below.

I've manually fixed this author string issues.

Reviewed-by: Robert Foss <robert.foss@...aro.org>

Applied to drm-misc-next.


----

Checking attestation on all messages, may take a moment...
Traceback (most recent call last):
  File "/usr/bin/b4", line 33, in <module>
    sys.exit(load_entry_point('b4==0.8.0', 'console_scripts', 'b4')())
  File "/usr/lib/python3/dist-packages/b4/command.py", line 246, in cmd
    cmdargs.func(cmdargs)
  File "/usr/lib/python3/dist-packages/b4/command.py", line 51, in cmd_am
    b4.mbox.main(cmdargs)
  File "/usr/lib/python3/dist-packages/b4/mbox.py", line 593, in main
    make_am(msgs, cmdargs, msgid)
  File "/usr/lib/python3/dist-packages/b4/mbox.py", line 92, in make_am
    am_msgs = lser.get_am_ready(noaddtrailers=cmdargs.noaddtrailers,
  File "/usr/lib/python3/dist-packages/b4/__init__.py", line 523, in
get_am_ready
    checkmark, trailers, attcrit =
lmsg.get_attestation_trailers(attpolicy, maxdays)
  File "/usr/lib/python3/dist-packages/b4/__init__.py", line 1173, in
get_attestation_trailers
    for attestor in self.attestors:
  File "/usr/lib/python3/dist-packages/b4/__init__.py", line 1028, in attestors
    self._load_dkim_attestors()
  File "/usr/lib/python3/dist-packages/b4/__init__.py", line 1071, in
_load_dkim_attestors
    res = dkim.verify(self.msg.as_bytes(), logger=dkimlogger)
  File "/usr/lib/python3/dist-packages/dkim/__init__.py", line 1352, in verify
    return d.verify(dnsfunc=dnsfunc)
  File "/usr/lib/python3/dist-packages/dkim/__init__.py", line 940, in verify
    return self.verify_sig(sig, include_headers, sigheaders[idx], dnsfunc)
  File "/usr/lib/python3/dist-packages/dkim/__init__.py", line 773, in
verify_sig
    self.pk, self.keysize, self.ktag, self.seqtlsrpt = load_pk_from_dns(name,
  File "/usr/lib/python3/dist-packages/dkim/__init__.py", line 481, in
load_pk_from_dns
    s = dnsfunc(name, timeout=timeout)
  File "/usr/lib/python3/dist-packages/dkim/dnsplug.py", line 88, in get_txt
    txt = _get_txt(unicode_name, timeout)
  File "/usr/lib/python3/dist-packages/dkim/dnsplug.py", line 31, in
get_txt_dnspython
    a = dns.resolver.query(name,
dns.rdatatype.TXT,raise_on_no_answer=False, lifetime=timeout)
  File "/usr/lib/python3/dist-packages/dns/resolver.py", line 1321, in query
    return resolve(qname, rdtype, rdclass, tcp, source,
  File "/usr/lib/python3/dist-packages/dns/resolver.py", line 1305, in resolve
    return get_default_resolver().resolve(qname, rdtype, rdclass, tcp, source,
  File "/usr/lib/python3/dist-packages/dns/resolver.py", line 1176, in resolve
    timeout = self._compute_timeout(start, lifetime)
  File "/usr/lib/python3/dist-packages/dns/resolver.py", line 997, in
_compute_timeout
    raise Timeout(timeout=duration)
dns.exception.Timeout: The DNS operation timed out after
5.402302026748657 seconds