linux-kernel - [PATCH v1 2/9] media: tegra-video: Enable VI pixel transform for YUV and RGB formats

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Date:   Tue, 20 Oct 2020 12:36:08 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     <skomatineni@...dia.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <hverkuil@...all.nl>
CC:     <mchehab@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 2/9] media: tegra-video: Enable VI pixel transform for YUV and RGB formats

VI Pixel transforms converts source pixel data to selected
destination pixel formats in memory and aligns properly.

YUV and RGB formats need this pixel transform to be enabled.

RAW formats use T_R16_I destination pixel format in memory and
does not need pixel transform as they support direct write to
memory.

So, this patch enables pixel transform for YUV and RGB and keeps
it bypass for RAW formats.

Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
 drivers/staging/media/tegra-video/tegra210.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/tegra-video/tegra210.c b/drivers/staging/media/tegra-video/tegra210.c
index ac066c0..6b23aa7 100644
--- a/drivers/staging/media/tegra-video/tegra210.c
+++ b/drivers/staging/media/tegra-video/tegra210.c
@@ -178,10 +178,23 @@ static int tegra_channel_capture_setup(struct tegra_vi_channel *chan)
 	u32 format = chan->fmtinfo->img_fmt;
 	u32 data_type = chan->fmtinfo->img_dt;
 	u32 word_count = (width * chan->fmtinfo->bit_width) / 8;
+	u32 bypass_pixel_transform = BIT(BYPASS_PXL_TRANSFORM_OFFSET);
+
+	/*
+	 * VI Pixel transformation unit converts source pixels data format
+	 * into selected destination pixel format and aligns properly while
+	 * interfacing with memory packer.
+	 * This pixel transformation should be enabled for YUV and RGB
+	 * formats and should be bypassed for RAW formats as RAW formats
+	 * only support direct to memory.
+	 */
+	if (chan->pg_mode || data_type == TEGRA_IMAGE_DT_YUV422_8 ||
+	    data_type == TEGRA_IMAGE_DT_RGB888)
+		bypass_pixel_transform = 0;
 
 	vi_csi_write(chan, TEGRA_VI_CSI_ERROR_STATUS, 0xffffffff);
 	vi_csi_write(chan, TEGRA_VI_CSI_IMAGE_DEF,
-		     ((chan->pg_mode ? 0 : 1) << BYPASS_PXL_TRANSFORM_OFFSET) |
+		     bypass_pixel_transform |
 		     (format << IMAGE_DEF_FORMAT_OFFSET) |
 		     IMAGE_DEF_DEST_MEM);
 	vi_csi_write(chan, TEGRA_VI_CSI_IMAGE_DT, data_type);
-- 
2.7.4