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([106.222.234.180]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b93be4045fbsm4041381a12.28.2025.10.31.23.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Oct 2025 23:33:18 -0700 (PDT) From: Pavan Bobba To: skhan@linuxfoundation.org, kieran.bingham@ideasonboard.com, mchehab@kernel.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Pavan Bobba Subject: [PATCH] media: vimc: add support for V4L2_FIELD_ALTERNATE in vimc-sensor Date: Sat, 1 Nov 2025 12:03:12 +0530 Message-ID: <20251101063312.13466-1-opensource206@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The vimc sensor currently ignores V4L2_FIELD_ALTERNATE and always configures the test pattern generator (TPG) with a progressive field. This patch adds basic handling for the ALTERNATE field type. When userspace requests V4L2_FIELD_ALTERNATE, the TPG is configured to output alternating top and bottom fields by calling tpg_s_field() with the interlaced flag set. For all other field types, existing progressive behaviour is preserved. This change allows the vimc-sensor subdevice to correctly reflect the requested field type in its reported format, enabling basic testing of interlaced-field negotiation in the media pipeline. Other vimc entities (debayer, scaler, capture) still treat all streams as progressive, so streaming with ALTERNATE may not yet succeed. Signed-off-by: Pavan Bobba --- drivers/media/test-drivers/vimc/vimc-sensor.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/media/test-drivers/vimc/vimc-sensor.c b/drivers/media/= test-drivers/vimc/vimc-sensor.c index 027767777763..900c3f329f1c 100644 --- a/drivers/media/test-drivers/vimc/vimc-sensor.c +++ b/drivers/media/test-drivers/vimc/vimc-sensor.c @@ -105,8 +105,10 @@ static void vimc_sensor_tpg_s_format(struct vimc_senso= r_device *vsensor, tpg_s_bytesperline(&vsensor->tpg, 0, format->width * vpix->bpp); tpg_s_buf_height(&vsensor->tpg, format->height); tpg_s_fourcc(&vsensor->tpg, vpix->pixelformat); - /* TODO: add support for V4L2_FIELD_ALTERNATE */ - tpg_s_field(&vsensor->tpg, format->field, false); + if (format->field =3D=3D V4L2_FIELD_ALTERNATE) + tpg_s_field(&vsensor->tpg, V4L2_FIELD_TOP, true); + else + tpg_s_field(&vsensor->tpg, format->field, false); tpg_s_colorspace(&vsensor->tpg, format->colorspace); tpg_s_ycbcr_enc(&vsensor->tpg, format->ycbcr_enc); tpg_s_quantization(&vsensor->tpg, format->quantization); @@ -127,8 +129,7 @@ static void vimc_sensor_adjust_fmt(struct v4l2_mbus_fra= mefmt *fmt) fmt->height =3D clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT, VIMC_FRAME_MAX_HEIGHT) & ~1; =20 - /* TODO: add support for V4L2_FIELD_ALTERNATE */ - if (fmt->field =3D=3D V4L2_FIELD_ANY || fmt->field =3D=3D V4L2_FIELD_ALTE= RNATE) + if (fmt->field =3D=3D V4L2_FIELD_ANY) fmt->field =3D fmt_default.field; =20 vimc_colorimetry_clamp(fmt); --=20 2.43.0