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From: Chen-Yu Tsai <wens@csie.org>
To: Jagan Teki <jagan@amarulasolutions.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>,
	Icenowy Zheng <icenowy@aosc.io>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Vasily Khoruzhick <anarsoul@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	David Airlie <airlied@linux.ie>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Mike Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	Michael Trimarchi <michael@amarulasolutions.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	devicetree <devicetree@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-sunxi <linux-sunxi@googlegroups.com>
Subject: Re: [linux-sunxi] Re: [PATCH 04/12] drm/sun4i: sun6i_mipi_dsi: Enable missing DSI bus clock
Date: Fri, 28 Sep 2018 00:33:39 +0800	[thread overview]
Message-ID: <CAGb2v66RPYqH2uDF_izW3PdNrvBhmXecs5A6ThW-3xMeQampqA@mail.gmail.com> (raw)
In-Reply-To: <CAMty3ZAsF=uSJqj2L9ZS8N3CqcSUPzFSdtH8WtZPTg3m-K8COQ@mail.gmail.com>

On Fri, Sep 28, 2018 at 12:26 AM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> On Thu, Sep 27, 2018 at 7:47 PM Chen-Yu Tsai <wens@csie.org> wrote:
> >
> > On Thu, Sep 27, 2018 at 9:44 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
> > >
> > > On Thu, Sep 27, 2018 at 6:13 PM Chen-Yu Tsai <wens@csie.org> wrote:
> > > >
> > > > Hi,
> > > >
> > > > On Thu, Sep 27, 2018 at 7:49 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
> > > > >
> > > > > DSI bus_clk is already available in sun6i_dsi but missed to
> > > > > get the clk and process for enable/disable.
> > > > >
> > > > > This patch add support for it.
> > > > >
> > > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > > > ---
> > > > >  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 8 ++++++++
> > > > >  1 file changed, 8 insertions(+)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > index 8e9c76febca2..156b371243c6 100644
> > > > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > > > @@ -1004,6 +1004,12 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> > > > >                 return PTR_ERR(dsi->reset);
> > > > >         }
> > > > >
> > > > > +       dsi->bus_clk = devm_clk_get(dev, "bus");
> > > > > +       if (IS_ERR(dsi->bus_clk)) {
> > > > > +               dev_err(dev, "Couldn't get the DSI bus clock\n");
> > > > > +               return PTR_ERR(dsi->bus_clk);
> > > > > +       }
> > > > > +
> > > >
> > > > The DSI driver uses devm_regmap_init_mmio_clk, which enables the
> > > > clock behind the scenes when regmap access needs it enabled.
> > > >
> > > > Did you have any issues without this patch?
> > >
> > > I'm unable to read register values via devmem, I see all 0's for all
> > > dsi reg space.
> >
> > Well that is to be expected given how mmio with clk regmap works.
> > Did you encounter any other problems besides this?
>
> no
>
> >
> > FYI you can dump regmap contents using /sys/kernel/debug/regmap/*/registers
>
> Thanks, but ccu not using regmap I believe so can't see bus enabled
> bit set via devmap
> # devmem 0x01C20060
> 0x33800000

That is perfectly normal. It is only enabled when there are accesses to the
DSI regmap.

ChenYu

  reply	other threads:[~2018-09-27 16:33 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-27 11:48 [PATCH 00/12] drm/sun4i: Allwinner A64 MIPI-DSI support Jagan Teki
2018-09-27 11:48 ` [PATCH 01/12] clk: sunxi-ng: a64: Fix gate bit of DSI DPHY Jagan Teki
2018-09-27 11:48 ` [PATCH 02/12] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support Jagan Teki
2018-09-27 11:48 ` [PATCH 03/12] dt-bindings: sun6i-dsi: Add compatible for A64 MIPI DSI Jagan Teki
2018-10-15 18:24   ` Rob Herring
2018-09-27 11:48 ` [PATCH 04/12] drm/sun4i: sun6i_mipi_dsi: Enable missing DSI bus clock Jagan Teki
2018-09-27 12:42   ` Chen-Yu Tsai
2018-09-27 13:44     ` Jagan Teki
2018-09-27 14:16       ` [linux-sunxi] " Chen-Yu Tsai
2018-09-27 16:26         ` Jagan Teki
2018-09-27 16:33           ` Chen-Yu Tsai [this message]
2018-09-27 11:48 ` [PATCH 05/12] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2018-09-27 17:18   ` Maxime Ripard
2018-09-27 17:36     ` Jagan Teki
2018-09-29 13:47       ` Maxime Ripard
2018-09-27 11:48 ` [PATCH 06/12] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2018-09-27 15:21   ` Maxime Ripard
2018-09-27 16:20     ` Jagan Teki
2018-09-29 13:53       ` Maxime Ripard
2018-10-01  8:09         ` [linux-sunxi] " Jagan Teki
2018-10-08 15:05           ` Maxime Ripard
2018-09-27 11:48 ` [PATCH 07/12] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits Jagan Teki
2018-09-27 16:58   ` Maxime Ripard
2018-09-27 17:45     ` Jagan Teki
2018-10-02 13:20       ` Maxime Ripard
2018-10-03  3:22         ` [linux-sunxi] " Jagan Teki
2018-10-08 15:05           ` Maxime Ripard
2018-09-27 11:48 ` [PATCH 08/12] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2018-09-27 17:14   ` Maxime Ripard
2018-09-27 17:33     ` Jagan Teki
2018-09-29 15:27       ` Maxime Ripard
2018-10-01  7:55         ` [linux-sunxi] " Jagan Teki
2018-10-02 13:29           ` Maxime Ripard
2018-09-27 11:48 ` [PATCH 09/12] dt-bindings: panel: Add Bananapi S070WV20-CT16 MIPI-DSI panel bindings Jagan Teki
2018-10-15 18:24   ` Rob Herring
2018-10-22 10:22     ` Chen-Yu Tsai
2018-10-23 15:11       ` Rob Herring
2018-10-24 20:22         ` Chen-Yu Tsai
2018-09-27 11:48 ` [PATCH 10/12] drm/panel: Add Bananapi S070WV20-CT16 MIPI-DSI panel driver Jagan Teki
2018-09-28  4:32   ` Chen-Yu Tsai
2018-10-04 16:06     ` Jagan Teki
2018-09-27 11:48 ` [PATCH 11/12] arm64: dts: allwinner: a64: Add DSI pipeline Jagan Teki
2018-09-27 17:16   ` Maxime Ripard
2018-09-27 11:48 ` [PATCH 12/12] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel Jagan Teki
2018-09-27 17:17   ` Maxime Ripard
2018-10-04 16:03     ` Jagan Teki
2018-10-05 15:31       ` Maxime Ripard

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