From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 104AF72 for ; Sun, 4 Jul 2021 23:11:16 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id A47FE619AC; Sun, 4 Jul 2021 23:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625440275; bh=rLIR0S92aTlG9q/OkSLRKIJuW7+/bZqEm10UhBiwYL8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PsVS8KEYC6PnvvFYAqSbo6uIr2rYwZZ4KIJTFPSTRiMJ/cRry8pKeu7TgBOXPRmeL SDu+/4hTD7uo0lgQrTwihfSxyfpJoa1glO7oKCiaOhBcEqRyRd8wO12Wnbri9pJ6FU +dRJiizUK0/bJMfH1FMhxoyrJ3zZIohnWnxUv5aXR6I0e2VMZ1jVDH56rENT1pFNzi oK0z5vHMV5GoxW/1lLj489GmMR48SI+E2PbtP8Pf75Ynt7QFPd7X3FPLVjw8ofOL/9 ByRCn5MdgCqiNddt7cLkJI9UGbGgpAiMBY98C3Ej5N+4HwRkZkCcgKiBeNUwBAeZzr ohWiaJMt9srIw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Steve Longerbeam , Fabio Estevam , Tim Harvey , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.19 25/31] media: imx-csi: Skip first few frames from a BT.656 source Date: Sun, 4 Jul 2021 19:10:37 -0400 Message-Id: <20210704231043.1491209-25-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210704231043.1491209-1-sashal@kernel.org> References: <20210704231043.1491209-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Steve Longerbeam [ Upstream commit e198be37e52551bb863d07d2edc535d0932a3c4f ] Some BT.656 sensors (e.g. ADV718x) transmit frames with unstable BT.656 sync codes after initial power on. This confuses the imx CSI,resulting in vertical and/or horizontal sync issues. Skip the first 20 frames to avoid the unstable sync codes. [fabio: fixed checkpatch warning and increased the frame skipping to 20] Signed-off-by: Steve Longerbeam Signed-off-by: Fabio Estevam Reviewed-by: Tim Harvey Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/staging/media/imx/imx-media-csi.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c index 0f8fdc347091..c7df0ffb3510 100644 --- a/drivers/staging/media/imx/imx-media-csi.c +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -730,9 +730,10 @@ static int csi_setup(struct csi_priv *priv) static int csi_start(struct csi_priv *priv) { - struct v4l2_fract *output_fi; + struct v4l2_fract *input_fi, *output_fi; int ret; + input_fi = &priv->frame_interval[CSI_SINK_PAD]; output_fi = &priv->frame_interval[priv->active_output_pad]; /* start upstream */ @@ -741,6 +742,17 @@ static int csi_start(struct csi_priv *priv) if (ret) return ret; + /* Skip first few frames from a BT.656 source */ + if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) { + u32 delay_usec, bad_frames = 20; + + delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC * + input_fi->numerator * bad_frames, + input_fi->denominator); + + usleep_range(delay_usec, delay_usec + 1000); + } + if (priv->dest == IPU_CSI_DEST_IDMAC) { ret = csi_idmac_start(priv); if (ret) -- 2.30.2