From: Ezequiel Garcia <ezequiel@collabora.com>
To: Fabio Estevam <festevam@gmail.com>,
Adrian Ratiu <adrian.ratiu@collabora.com>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Sjoerd Simons <sjoerd.simons@collabora.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Martyn Welch <martyn.welch@collabora.com>,
Jonas Karlman <jonas@kwiboo.se>,
linux-kernel <linux-kernel@vger.kernel.org>,
DRI mailing list <dri-devel@lists.freedesktop.org>,
Emil Velikov <emil.velikov@collabora.com>,
linux-rockchip@lists.infradead.org,
NXP Linux Team <linux-imx@nxp.com>,
kernel@collabora.com, linux-stm32@st-md-mailman.stormreply.com,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Subject: Re: [PATCH v5 4/5] drm: imx: Add i.MX 6 MIPI DSI host platform driver
Date: Mon, 30 Mar 2020 10:51:23 -0300 [thread overview]
Message-ID: <4a9d2d6e5cecbe296c14119d27a8793a7dbed7b2.camel@collabora.com> (raw)
In-Reply-To: <CAOMZO5CEZSBfhb9xAdf=sDhUnmSeuWSsnUQArz=a1TPzytLAeQ@mail.gmail.com>
Hello Fabio, Adrian:
On Mon, 2020-03-30 at 08:49 -0300, Fabio Estevam wrote:
> Hi Adrian,
>
> On Mon, Mar 30, 2020 at 8:34 AM Adrian Ratiu <adrian.ratiu@collabora.com> wrote:
> > This adds support for the Synopsis DesignWare MIPI DSI v1.01 host
> > controller which is embedded in i.MX 6 SoCs.
> >
> > Based on following patches, but updated/extended to work with existing
> > support found in the kernel:
> >
> > - drm: imx: Support Synopsys DesignWare MIPI DSI host controller
> > Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
> >
> > - ARM: dtsi: imx6qdl: Add support for MIPI DSI host controller
> > Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
>
> This one looks like a devicetree patch, but this patch does not touch
> devicetree.
>
> > + ret = clk_prepare_enable(dsi->pllref_clk);
> > + if (ret) {
> > + dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
> > + return ret;
> > + }
> > +
> > + dsi->mux_sel = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,gpr");
> > + if (IS_ERR(dsi->mux_sel)) {
> > + ret = PTR_ERR(dsi->mux_sel);
> > + dev_err(dev, "%s: Failed to get GPR regmap: %d\n",
> > + __func__, ret);
> > + return ret;
>
> You should disable the dsi->pllref_clk clock prior to returning the error.
>
Another approach could be moving the clock on and off to
to component_ops.{bind,unbind} (as rockhip driver does).
What exactly is the PLL clock needed for? Would it make sense
to move it some of the PHY power on/off? (Maybe not, but it's worthing
checking).
Also, it seems the other IP blocks have this PLL clock, so maybe
it could be moved to the dw_mipi_dsi core? This could be something
for a follow-up, to avoid creeping this series.
Thanks,
Ezequiel
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next prev parent reply other threads:[~2020-03-30 13:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200330113455eucas1p1441dc79d44de5081e9d90079e2020ca0@eucas1p1.samsung.com>
2020-03-30 11:35 ` [PATCH v5 0/5] Genericize DW MIPI DSI bridge and add i.MX 6 driver Adrian Ratiu
2020-03-30 11:35 ` [PATCH v5 1/5] drm: bridge: dw_mipi_dsi: add initial regmap infrastructure Adrian Ratiu
2020-03-30 15:58 ` adrian61
2020-03-30 16:13 ` adrian61
2020-03-30 21:16 ` Adrian Ratiu
2020-03-30 11:35 ` [PATCH v5 2/5] drm: bridge: dw_mipi_dsi: abstract register access using reg_fields Adrian Ratiu
2020-04-06 15:39 ` Andrzej Hajda
2020-04-10 10:22 ` Adrian Ratiu
2020-03-30 11:35 ` [PATCH v5 3/5] drm: bridge: synopsis: add dsi v1.01 support Adrian Ratiu
2020-03-30 16:08 ` adrian61
2020-03-30 21:18 ` Adrian Ratiu
2020-03-30 11:35 ` [PATCH v5 4/5] drm: imx: Add i.MX 6 MIPI DSI host platform driver Adrian Ratiu
2020-03-30 11:49 ` Fabio Estevam
2020-03-30 13:51 ` Ezequiel Garcia [this message]
2020-03-30 21:31 ` Adrian Ratiu
2020-03-31 4:05 ` Ezequiel Garcia
2020-03-31 7:19 ` Adrian Ratiu
2020-03-30 21:20 ` Adrian Ratiu
2020-03-30 11:35 ` [PATCH v5 5/5] dt-bindings: display: add i.MX6 MIPI DSI host controller doc Adrian Ratiu
2020-03-30 11:52 ` Fabio Estevam
2020-03-30 15:44 ` Rob Herring
2020-04-06 14:23 ` [PATCH v5 0/5] Genericize DW MIPI DSI bridge and add i.MX 6 driver Andrzej Hajda
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