From: Maxime Ripard <maxime@cerno.tech>
To: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org,
linux-sunxi@googlegroups.com,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Chen-Yu Tsai" <wens@csie.org>,
"Yong Deng" <yong.deng@magewell.com>,
"Kishon Vijay Abraham I" <kishon@ti.com>,
"Vinod Koul" <vkoul@kernel.org>,
"Helen Koike" <helen.koike@collabora.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Hans Verkuil" <hans.verkuil@cisco.com>,
"Sakari Ailus" <sakari.ailus@linux.intel.com>,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Hans Verkuil" <hverkuil@xs4all.nl>,
kevin.lhopital@hotmail.com,
"Kévin L'hôpital" <kevin.lhopital@bootlin.com>
Subject: Re: [PATCH 05/14] media: sun6i-csi: Only configure the interface data width for parallel
Date: Tue, 27 Oct 2020 19:31:07 +0100 [thread overview]
Message-ID: <20201027183107.sofqfbmgg5aancmr@gilmour.lan> (raw)
In-Reply-To: <20201027093119.GD168350@aptenodytes>
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On Tue, Oct 27, 2020 at 10:31:19AM +0100, Paul Kocialkowski wrote:
> Hi,
>
> On Mon 26 Oct 20, 17:00, Maxime Ripard wrote:
> > On Fri, Oct 23, 2020 at 07:45:37PM +0200, Paul Kocialkowski wrote:
> > > Bits related to the interface data width do not have any effect when
> > > the CSI controller is taking input from the MIPI CSI-2 controller.
> >
> > I guess it would be clearer to mention that the data width is only
> > applicable for parallel here.
>
> Understood, will change the wording in the next version.
>
> > > In prevision of adding support for this case, set these bits
> > > conditionally so there is no ambiguity.
> > >
> > > Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > > Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > > ---
> > > .../platform/sunxi/sun6i-csi/sun6i_csi.c | 42 +++++++++++--------
> > > 1 file changed, 25 insertions(+), 17 deletions(-)
> > >
> > > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > index 5d2389a5cd17..a876a05ea3c7 100644
> > > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > @@ -378,8 +378,13 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > > unsigned char bus_width;
> > > u32 flags;
> > > u32 cfg;
> > > + bool input_parallel = false;
> > > bool input_interlaced = false;
> > >
> > > + if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
> > > + endpoint->bus_type == V4L2_MBUS_BT656)
> > > + input_parallel = true;
> > > +
> > > if (csi->config.field == V4L2_FIELD_INTERLACED
> > > || csi->config.field == V4L2_FIELD_INTERLACED_TB
> > > || csi->config.field == V4L2_FIELD_INTERLACED_BT)
> > > @@ -395,6 +400,26 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > > CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
> > > CSI_IF_CFG_SRC_TYPE_MASK);
> > >
> > > + if (input_parallel) {
> > > + switch (bus_width) {
> > > + case 8:
> > > + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > > + break;
> > > + case 10:
> > > + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > > + break;
> > > + case 12:
> > > + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > > + break;
> > > + case 16: /* No need to configure DATA_WIDTH for 16bit */
> > > + break;
> > > + default:
> > > + dev_warn(sdev->dev, "Unsupported bus width: %u\n",
> > > + bus_width);
> > > + break;
> > > + }
> > > + }
> > > +
> > > if (input_interlaced)
> > > cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
> > > else
> > > @@ -440,23 +465,6 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > > break;
> > > }
> > >
> > > - switch (bus_width) {
> > > - case 8:
> > > - cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > > - break;
> > > - case 10:
> > > - cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > > - break;
> > > - case 12:
> > > - cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > > - break;
> > > - case 16: /* No need to configure DATA_WIDTH for 16bit */
> > > - break;
> > > - default:
> > > - dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
> > > - break;
> > > - }
> > > -
> >
> > Is there any reason to move it around?
>
> The main reason is cosmetics: input_parallel is introduced to match the already
> existing input_interlaced variable, so it made sense to me to have both of these
> conditionals one after the other instead of spreading them randomly.
>
> I can mention this in the commit log if you prefer.
Yeah, that would great
Maxime
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next prev parent reply other threads:[~2020-10-27 18:31 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-23 17:45 [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 01/14] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes Paul Kocialkowski
2020-10-23 18:18 ` [linux-sunxi] " Jernej Škrabec
2020-10-24 8:31 ` Paul Kocialkowski
2020-10-30 22:44 ` Helen Koike
2020-10-23 17:45 ` [PATCH 02/14] phy: allwinner: phy-sun6i-mipi-dphy: Support D-PHY Rx mode for MIPI CSI-2 Paul Kocialkowski
2020-10-26 15:38 ` Maxime Ripard
2020-10-27 9:23 ` Paul Kocialkowski
2020-10-27 18:28 ` Maxime Ripard
2020-11-04 10:53 ` Paul Kocialkowski
2020-10-30 22:44 ` Helen Koike
2020-11-04 10:54 ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 03/14] media: sun6i-csi: Support an optional dedicated memory pool Paul Kocialkowski
2020-10-26 15:41 ` Maxime Ripard
2020-10-27 9:26 ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 04/14] media: sun6i-csi: Fix the image storage bpp for 10/12-bit Bayer formats Paul Kocialkowski
2020-10-30 22:45 ` Helen Koike
2020-11-04 10:56 ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 05/14] media: sun6i-csi: Only configure the interface data width for parallel Paul Kocialkowski
2020-10-26 16:00 ` Maxime Ripard
2020-10-27 9:31 ` Paul Kocialkowski
2020-10-27 18:31 ` Maxime Ripard [this message]
2020-10-23 17:45 ` [PATCH 06/14] media: sun6i-csi: Support feeding from the MIPI CSI-2 controller Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 07/14] dt-bindings: media: i2c: Add A31 MIPI CSI-2 bindings documentation Paul Kocialkowski
2020-10-26 16:14 ` Maxime Ripard
2020-10-27 9:52 ` Paul Kocialkowski
2020-10-27 18:44 ` Maxime Ripard
2020-11-04 10:48 ` Paul Kocialkowski
2020-11-04 16:53 ` Maxime Ripard
2020-10-30 16:33 ` Rob Herring
2020-10-30 16:56 ` Sakari Ailus
2020-10-23 17:45 ` [PATCH 08/14] media: sunxi: Add support for the A31 MIPI CSI-2 controller Paul Kocialkowski
2020-10-26 8:39 ` Dan Carpenter
2020-10-26 16:54 ` Maxime Ripard
2020-11-04 11:34 ` Paul Kocialkowski
2020-11-04 18:56 ` Maxime Ripard
2020-11-05 14:52 ` Paul Kocialkowski
2020-10-30 22:45 ` Helen Koike
2020-11-02 9:21 ` Maxime Ripard
2020-11-04 11:17 ` Paul Kocialkowski
2020-11-04 16:38 ` Helen Koike
2020-11-04 18:45 ` Maxime Ripard
2020-11-05 14:14 ` Helen Koike
2020-11-05 8:45 ` Sakari Ailus
2020-11-05 14:55 ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 09/14] ARM: dts: sun8i: v3s: Add CSI0 camera interface node Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 10/14] ARM: dts: sun8i: v3s: Add MIPI D-PHY and MIPI CSI-2 interface nodes Paul Kocialkowski
2020-10-26 16:55 ` Maxime Ripard
2020-10-23 17:45 ` [PATCH 11/14] dt-bindings: media: i2c: Add A83T MIPI CSI-2 bindings documentation Paul Kocialkowski
2020-10-26 16:56 ` Maxime Ripard
2020-11-04 10:33 ` Paul Kocialkowski
2020-11-05 8:48 ` Sakari Ailus
2020-10-23 17:45 ` [PATCH 12/14] media: sunxi: Add support for the A83T MIPI CSI-2 controller Paul Kocialkowski
2020-10-26 8:53 ` Dan Carpenter
2020-10-26 17:00 ` Maxime Ripard
2020-11-04 10:37 ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 13/14] ARM: dts: sun8i: a83t: Add MIPI CSI-2 controller node Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 14/14] media: sunxi: sun8i-a83t-mipi-csi2: Avoid using the (unsolicited) interrupt Paul Kocialkowski
2020-10-26 16:57 ` Maxime Ripard
2020-10-26 17:20 ` [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T Maxime Ripard
2020-10-30 22:44 ` Helen Koike
2020-11-02 9:17 ` Maxime Ripard
2020-11-04 11:11 ` Paul Kocialkowski
2020-11-04 11:14 ` Paul Kocialkowski
2020-11-04 16:36 ` Helen Koike
2020-11-05 14:58 ` Paul Kocialkowski
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