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From:   <Eugen.Hristev@microchip.com>
To:     <hverkuil@xs4all.nl>, <linux-media@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
CC:     <Eugen.Hristev@microchip.com>
Subject: [PATCH 1/3] media: atmel: atmel-isi: add support for mono sensors,
 GRAY and Y16
Thread-Topic: [PATCH 1/3] media: atmel: atmel-isi: add support for mono
 sensors, GRAY and Y16
Thread-Index: AQHVpr7GvLIuZGJMNEmiKig2JR9Z7w==
Date:   Fri, 29 Nov 2019 14:10:38 +0000
Message-ID: <1575036609-11381-1-git-send-email-eugen.hristev@microchip.com>
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From: Eugen Hristev <eugen.hristev@microchip.com>

This adds support for GREY and Y16 formats, based on Y10 mbus codes.
Y16 needs to go through preview path in the ISI, with 2 pixels per word,
and it fits the Y16 format. The ISI data lines need to be MSB aligned with
the sensor data lines.
GREY format in 8 bits per pixel is done by dropping the 2 LSB bits
from the Y10 format, and packed as 4 pixels per word.

Suggested-by: Wenyou Yang <wenyou.yang@microchip.com>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 drivers/media/platform/atmel/atmel-isi.c | 13 ++++++++++++-
 drivers/media/platform/atmel/atmel-isi.h |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platf=
orm/atmel/atmel-isi.c
index 428f117..35c1f1a 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -148,7 +148,8 @@ static void configure_geometry(struct atmel_isi *isi)
 	u32 fourcc =3D isi->current_fmt->fourcc;
=20
 	isi->enable_preview_path =3D fourcc =3D=3D V4L2_PIX_FMT_RGB565 ||
-				   fourcc =3D=3D V4L2_PIX_FMT_RGB32;
+				   fourcc =3D=3D V4L2_PIX_FMT_RGB32 ||
+				   fourcc =3D=3D V4L2_PIX_FMT_Y16;
=20
 	/* According to sensor's output format to set cfg2 */
 	cfg2 =3D isi->current_fmt->swap;
@@ -990,6 +991,16 @@ static const struct isi_format isi_formats[] =3D {
 		.mbus_code =3D MEDIA_BUS_FMT_VYUY8_2X8,
 		.bpp =3D 2,
 		.swap =3D ISI_CFG2_YCC_SWAP_MODE_1,
+	}, {
+		.fourcc =3D V4L2_PIX_FMT_GREY,
+		.mbus_code =3D MEDIA_BUS_FMT_Y10_1X10,
+		.bpp =3D 1,
+		.swap =3D ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
+	}, {
+		.fourcc =3D V4L2_PIX_FMT_Y16,
+		.mbus_code =3D MEDIA_BUS_FMT_Y10_1X10,
+		.bpp =3D 2,
+		.swap =3D ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
 	},
 };
=20
diff --git a/drivers/media/platform/atmel/atmel-isi.h b/drivers/media/platf=
orm/atmel/atmel-isi.h
index 47a9108..7ad3895 100644
--- a/drivers/media/platform/atmel/atmel-isi.h
+++ b/drivers/media/platform/atmel/atmel-isi.h
@@ -62,6 +62,8 @@
 #define		ISI_CFG1_THMASK_BEATS_16	(2 << 13)
=20
 /* Bitfields in CFG2 */
+#define ISI_CFG2_GS_MODE_2_PIXEL		(0 << 11)
+#define ISI_CFG2_GS_MODE_1_PIXEL		(1 << 11)
 #define ISI_CFG2_GRAYSCALE			(1 << 13)
 #define ISI_CFG2_COL_SPACE_YCbCr		(0 << 15)
 #define ISI_CFG2_COL_SPACE_RGB			(1 << 15)
--=20
2.7.4