From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f173.google.com (mail-pf1-f173.google.com [209.85.210.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 12A6E2C9D for ; Fri, 24 Dec 2021 08:43:29 +0000 (UTC) Received: by mail-pf1-f173.google.com with SMTP id k64so7281759pfd.11 for ; Fri, 24 Dec 2021 00:43:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=eVYg6vqK0bkjeQRhVKIbYAOnwHGxgaBimTUyzl5wfWU=; b=DSi9fT87X/aQ8j99LRzb46Wq1GH2EqAtDCrJVsAMspshyX9URQfBz6K+q5fJwVCHCb e46+U5RO2/BSYx742BVsAROr8Xn3nEPAx0d+GnFEf7cu5S+E+qbRxAEIaGb9HMSi/CPU 3W2UEziHeqoFpnqAvvSCfeYnqfr1K91xIZC/s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=eVYg6vqK0bkjeQRhVKIbYAOnwHGxgaBimTUyzl5wfWU=; b=lpSTpKK3hraBRivF/fTvUYrO3HutgH4sOMVZzXmbBJT+YyGK+ZINvzXCfPbGx3wZl4 QnSG1Ae+TiwBihCfMzW8KszR3lfaACRkgD33I5HM9f3JzqwQR/mdbV3bGJSLVZX51Ziq cmn6Krd3B8SGVzSBRWIiRSYlykerzMNIxgObVwX2BBVlx5h+OuVt9zmZSiggTrxfLoc3 gnpyEzG6YxMq7hU0Sq9wNgzHfTXI2CPQ0Vb/cHMKwzMb01KMM63l7CRhek7b7Kljl0jG 8XXTg0aO6PBdYCo+AGfh2Rri1jE2g8/BRSWL0aYtfIdNKHHqznWVqowE9KeBixjD5p7V m0UQ== X-Gm-Message-State: AOAM532eHbWqXIt1IwJhrsfxGxlr6hzg7LfPYiw5IVWHdjMudlI2NfIM 1mtUsdT9D7624GSPxL2IkbZUmw== X-Google-Smtp-Source: ABdhPJxZbbX4Ne8SBwTui1zct2EjoGavD3KorLUC07IOY5SGzG1gbt9det+g1w/jEAaZ0gxMh+oSgQ== X-Received: by 2002:a05:6a00:15cb:b0:4ba:edb1:c03c with SMTP id o11-20020a056a0015cb00b004baedb1c03cmr5970245pfu.54.1640335408697; Fri, 24 Dec 2021 00:43:28 -0800 (PST) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:fd40:cbd0:c42a:3c26]) by smtp.gmail.com with ESMTPSA id p13sm436369pgl.23.2021.12.24.00.43.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Dec 2021 00:43:28 -0800 (PST) From: Chen-Yu Tsai To: Ezequiel Garcia , Philipp Zabel , Mauro Carvalho Chehab , Hans Verkuil , Greg Kroah-Hartman Cc: Tomasz Figa , Chen-Yu Tsai , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH RFT 5/7] media: hantro: jpeg: Add COM segment to JPEG header to align image scan Date: Fri, 24 Dec 2021 16:42:46 +0800 Message-Id: <20211224084248.3070568-6-wenst@chromium.org> X-Mailer: git-send-email 2.34.1.448.ga2b2bfdf31-goog In-Reply-To: <20211224084248.3070568-1-wenst@chromium.org> References: <20211224084248.3070568-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The JPEG header size is not 64-bit aligned. This makes the driver require a bounce buffer for the encoded JPEG image scan output. Add a COM (comment) segment to the JPEG header so that the header size is a multiple of 64 bits. This will then allow dropping the use of the bounce buffer, and instead have the hardware write out to the capture buffer directly. Signed-off-by: Chen-Yu Tsai --- drivers/staging/media/hantro/hantro_jpeg.c | 3 +++ drivers/staging/media/hantro/hantro_jpeg.h | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/hantro/hantro_jpeg.c b/drivers/staging/media/hantro/hantro_jpeg.c index 7d4018bd6876..51e67e5cf86f 100644 --- a/drivers/staging/media/hantro/hantro_jpeg.c +++ b/drivers/staging/media/hantro/hantro_jpeg.c @@ -247,6 +247,9 @@ static const unsigned char hantro_jpeg_header[JPEG_HEADER_SIZE] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /* COM */ + 0xff, 0xfe, 0x00, 0x03, 0x00, + /* SOS */ 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, diff --git a/drivers/staging/media/hantro/hantro_jpeg.h b/drivers/staging/media/hantro/hantro_jpeg.h index f33c492134e4..0b49d0b82caa 100644 --- a/drivers/staging/media/hantro/hantro_jpeg.h +++ b/drivers/staging/media/hantro/hantro_jpeg.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0+ */ -#define JPEG_HEADER_SIZE 619 +#define JPEG_HEADER_SIZE 624 #define JPEG_QUANT_SIZE 64 struct hantro_jpeg_ctx { -- 2.34.1.448.ga2b2bfdf31-goog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DEA6DC433FE for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org The JPEG header size is not 64-bit aligned. This makes the driver require a bounce buffer for the encoded JPEG image scan output. Add a COM (comment) segment to the JPEG header so that the header size is a multiple of 64 bits. This will then allow dropping the use of the bounce buffer, and instead have the hardware write out to the capture buffer directly. Signed-off-by: Chen-Yu Tsai --- drivers/staging/media/hantro/hantro_jpeg.c | 3 +++ drivers/staging/media/hantro/hantro_jpeg.h | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/hantro/hantro_jpeg.c b/drivers/staging/media/hantro/hantro_jpeg.c index 7d4018bd6876..51e67e5cf86f 100644 --- a/drivers/staging/media/hantro/hantro_jpeg.c +++ b/drivers/staging/media/hantro/hantro_jpeg.c @@ -247,6 +247,9 @@ static const unsigned char hantro_jpeg_header[JPEG_HEADER_SIZE] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + /* COM */ + 0xff, 0xfe, 0x00, 0x03, 0x00, + /* SOS */ 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, diff --git a/drivers/staging/media/hantro/hantro_jpeg.h b/drivers/staging/media/hantro/hantro_jpeg.h index f33c492134e4..0b49d0b82caa 100644 --- a/drivers/staging/media/hantro/hantro_jpeg.h +++ b/drivers/staging/media/hantro/hantro_jpeg.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0+ */ -#define JPEG_HEADER_SIZE 619 +#define JPEG_HEADER_SIZE 624 #define JPEG_QUANT_SIZE 64 struct hantro_jpeg_ctx { -- 2.34.1.448.ga2b2bfdf31-goog _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip