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Fri, 29 Mar 2024 09:09:10 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20240329090910epsmtrp2c1c334f13c44c8188388377b5977bcc1~BMSDUYQw60038100381epsmtrp2P; Fri, 29 Mar 2024 09:09:10 +0000 (GMT) X-AuditID: b6c32a46-681ff700000025a7-6b-660685366d29 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 99.41.07541.63586066; Fri, 29 Mar 2024 18:09:10 +0900 (KST) Received: from [10.229.18.66] (unknown [10.229.18.66]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20240329090910epsmtip289a971388fb7c6521ebd55792e32b1f4~BMSDB2NTo1295712957epsmtip2u; Fri, 29 Mar 2024 09:09:10 +0000 (GMT) Message-ID: Date: Fri, 29 Mar 2024 18:09:00 +0900 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH] spi: s3c64xx: Use DMA mode from fifo size Content-Language: en-US To: Andi Shyti , Mark Brown , Krzysztof Kozlowski , Alim Akhtar , Sam Protsenko Cc: linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: Jaewon Kim In-Reply-To: <20240329085840.65856-1-jaewon02.kim@samsung.com> Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrIJsWRmVeSWpSXmKPExsWy7bCmua5ZK1uawctDVhYP5m1js7j/tYPR YurDJ2wWe19vZbfY9Pgaq8XlXXPYLGac38dk0fjxJrvF8759TA6cHptWdbJ53Lm2h81j85J6 j74tqxg9Pm+SC2CNyrbJSE1MSS1SSM1Lzk/JzEu3VfIOjneONzUzMNQ1tLQwV1LIS8xNtVVy 8QnQdcvMAbpHSaEsMacUKBSQWFyspG9nU5RfWpKqkJFfXGKrlFqQklNgXqBXnJhbXJqXrpeX WmJlaGBgZApUmJCdsWPWD+aCBXwVhw7tZGxgXM3dxcjJISFgItF66jNLFyMXh5DADkaJu8d3 s0E4nxglTvw8zwThfGOUOLN+ESNMy6f53cwQib2MEu9+7YTqf80oMfvQEVaQKl4BO4kJr26y gdgsAqoS39/fZ4KIC0qcnPmEBcQWFYiWaF12H6xGGKh+4o4nYBuYBcQlbj2ZD7ZaROAKo8SK b6vB1jELtDFKPGw7DlbFJqAt8X39YrBtnEDdZxfdYoHolpdo3jobrEFCYCaHxMHXh6AOd5G4 sn8tK4QtLPHq+BZ2CFtK4vO7vWwQdr5E25UzUPEaiY0LLkH12kssOvMTKM4BtEBTYv0ufRBT QkBZ4gjMWj6JjsN/2SHCvBIdbUIQjWoS96eegxouIzHpyEomiBIPiderwyYwKs5CCpVZSL6f heSXWQhrFzCyrGIUSy0ozk1PLTYqMILHdnJ+7iZGcFrVctvBOOXtB71DjEwcjIcYJTiYlUR4 dx5lSRPiTUmsrEotyo8vKs1JLT7EaAqMm4nMUqLJ+cDEnlcSb2hiaWBiZmZobmRqYK4kznuv dW6KkEB6YklqdmpqQWoRTB8TB6dUA9PZkitdtS0rEz+1qHa0yrCkS7RLhm2eYzZvf9LJRdLL JjNaLu9eH6AYteHkUVfG0A39+2ee8pvlU144+1lc0Rv9UzbbJvIGLWG8eobpgVLIs3vLbzYJ KLPpT2T23vzujD2DYpJevsaOWVe7vy97nBowT1XBS5nxxvszWeU+T4IiRaWM73MtdjJ95HG0 ePKFPJ1Fog6i/CYbQvfcvO38c7Fc0MNzUvuDmF4vu993RN6hZ5Wb5/Gnvvs2bjpd1W+70iD5 KvuKypufpgqmRl67zFlq6rmGtzwycP0Uu4tHt+/buG+pa7uKTyK/Wtc0a/vDLUmM3XPWHN5w vnzar+Nbd/PyLg85ytmqzGTOIau6gE+JpTgj0VCLuag4EQBuAWsRNAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmkeLIzCtJLcpLzFFi42LZdlhJXteslS3NYMtJIYsH87axWdz/2sFo MfXhEzaLva+3sltsenyN1eLyrjlsFjPO72OyaPx4k93ied8+JgdOj02rOtk87lzbw+axeUm9 R9+WVYwenzfJBbBGcdmkpOZklqUW6dslcGXsmPWDuWABX8WhQzsZGxhXc3cxcnJICJhIfJrf zdzFyMUhJLCbUeLS5O2sEAkZieXP+tggbGGJ+y1HWCGKXjJKHDtziQUkwStgJzHh1U2wIhYB VYnv7+8zQcQFJU7OfAJWIyoQLbH68wWwocJA9RN3PGEEsZkFxCVuPZnPBDJUROAao8TaOefB zmAWaGOU+LHnOxPEuomMEt/PfgVbwSagLfF9/WKwUZxAo84uusUCMcpMomtrF9RYeYnmrbOZ JzAKzUJyySwkG2chaZmFpGUBI8sqRsnUguLc9NxkwwLDvNRyveLE3OLSvHS95PzcTYzgeNLS 2MF4b/4/vUOMTByMhxglOJiVRHh3HmVJE+JNSaysSi3Kjy8qzUktPsQozcGiJM5rOGN2ipBA emJJanZqakFqEUyWiYNTqoHJnvFW+9WpOvOOqO5PNV3qfyt2jtByl+3n10e++x/Q2XFar89A QopHKGOBv3vIqh8nT7zaHLxi5Xo7cZfM+wKsZauypHWn3vxSsElm0ebOj+b/o/1nux6Lm6Ay 4VJ4OPfjNa8PSKu77jq3q/jiFP66EOOwlcdnL0q+epzp3LfgPfN+/LxZZ7tC32SmZoCGp1P0 FbHuWNZPvz6o796WqHQl5eSF9vm3V7ycqfn8w8ndh9dfZD13XfHFx+rU0kqGqqzrN8q+6Z2Z erZR5JnlnW9hMlZ/eebnlM4zDAh1z+UO4N+1dc9kphlM9ou39fM1l5pcP155NOLKIZ+TbcYt YdPZX+6JyFWa7DZlwcxcdqu4Y0osxRmJhlrMRcWJAK1zTfEWAwAA X-CMS-MailID: 20240329090910epcas2p2617aec2724c76180d02e80c9ab5e18d3 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240329090313epcas2p2cf95d22e44b6b1c120021622da68aeb8 References: <20240329085840.65856-1-jaewon02.kim@samsung.com> On 3/29/24 17:58, Jaewon Kim wrote: > If the SPI data size is smaller than FIFO, it operates in PIO mode, > and if it is larger than FIFO size, it oerates in DMA mode. > > If the SPI data size is equal to fifo, it operates in PIO mode and it is > separated to 2 transfers. To prevent it, it must operate in DMA mode > from the case where the data size and the fifo size are the same. > > Fixes: 1ee806718d5e ("spi: s3c64xx: support interrupt based pio mode") > Signed-off-by: Jaewon Kim > Reviewed-by: Sam Protsenko > --- > drivers/spi/spi-s3c64xx.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c > index 9fcbe040cb2f..f726d8670428 100644 > --- a/drivers/spi/spi-s3c64xx.c > +++ b/drivers/spi/spi-s3c64xx.c > @@ -430,7 +430,7 @@ static bool s3c64xx_spi_can_dma(struct spi_controller *host, > struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host); > > if (sdd->rx_dma.ch && sdd->tx_dma.ch) > - return xfer->len > sdd->fifo_depth; > + return xfer->len >= sdd->fifo_depth; > > return false; > } > @@ -826,10 +826,9 @@ static int s3c64xx_spi_transfer_one(struct spi_controller *host, > return status; > } > > - if (!is_polling(sdd) && (xfer->len > fifo_len) && > + if (!is_polling(sdd) && xfer->len >= fifo_len && > sdd->rx_dma.ch && sdd->tx_dma.ch) { > use_dma = 1; > - > } else if (xfer->len >= fifo_len) { > tx_buf = xfer->tx_buf; > rx_buf = xfer->rx_buf; Sorry, I didn't add v2 by mistake. This is v1 mail thread.  - https://lore.kernel.org/linux-arm-kernel/CAPLW+4k4qh4ZYBufZoGbUZN0yxSE2X8bOdkEQVw1Zg9YUVpbug@mail.gmail.com/T/ Thanks Jaewon Kim 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 1FCF8CD1288 for ; Fri, 29 Mar 2024 09:09:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To:From:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH] spi: s3c64xx: Use DMA mode from fifo size Content-Language: en-US To: Andi Shyti , Mark Brown , Krzysztof Kozlowski , Alim Akhtar , Sam Protsenko Cc: linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: Jaewon Kim In-Reply-To: <20240329085840.65856-1-jaewon02.kim@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrIJsWRmVeSWpSXmKPExsWy7bCmua5ZK1uawctDVhYP5m1js7j/tYPR YurDJ2wWe19vZbfY9Pgaq8XlXXPYLGac38dk0fjxJrvF8759TA6cHptWdbJ53Lm2h81j85J6 j74tqxg9Pm+SC2CNyrbJSE1MSS1SSM1Lzk/JzEu3VfIOjneONzUzMNQ1tLQwV1LIS8xNtVVy 8QnQdcvMAbpHSaEsMacUKBSQWFyspG9nU5RfWpKqkJFfXGKrlFqQklNgXqBXnJhbXJqXrpeX WmJlaGBgZApUmJCdsWPWD+aCBXwVhw7tZGxgXM3dxcjJISFgItF66jNLFyMXh5DADkaJu8d3 s0E4nxglTvw8zwThfGOUOLN+ESNMy6f53cwQib2MEu9+7YTqf80oMfvQEVaQKl4BO4kJr26y gdgsAqoS39/fZ4KIC0qcnPmEBcQWFYiWaF12H6xGGKh+4o4nYBuYBcQlbj2ZD7ZaROAKo8SK b6vB1jELtDFKPGw7DlbFJqAt8X39YrBtnEDdZxfdYoHolpdo3jobrEFCYCaHxMHXh6AOd5G4 sn8tK4QtLPHq+BZ2CFtK4vO7vWwQdr5E25UzUPEaiY0LLkH12kssOvMTKM4BtEBTYv0ufRBT QkBZ4gjMWj6JjsN/2SHCvBIdbUIQjWoS96eegxouIzHpyEomiBIPiderwyYwKs5CCpVZSL6f heSXWQhrFzCyrGIUSy0ozk1PLTYqMILHdnJ+7iZGcFrVctvBOOXtB71DjEwcjIcYJTiYlUR4 dx5lSRPiTUmsrEotyo8vKs1JLT7EaAqMm4nMUqLJ+cDEnlcSb2hiaWBiZmZobmRqYK4kznuv dW6KkEB6YklqdmpqQWoRTB8TB6dUA9PZkitdtS0rEz+1qHa0yrCkS7RLhm2eYzZvf9LJRdLL JjNaLu9eH6AYteHkUVfG0A39+2ee8pvlU144+1lc0Rv9UzbbJvIGLWG8eobpgVLIs3vLbzYJ KLPpT2T23vzujD2DYpJevsaOWVe7vy97nBowT1XBS5nxxvszWeU+T4IiRaWM73MtdjJ95HG0 ePKFPJ1Fog6i/CYbQvfcvO38c7Fc0MNzUvuDmF4vu993RN6hZ5Wb5/Gnvvs2bjpd1W+70iD5 KvuKypufpgqmRl67zFlq6rmGtzwycP0Uu4tHt+/buG+pa7uKTyK/Wtc0a/vDLUmM3XPWHN5w vnzar+Nbd/PyLg85ytmqzGTOIau6gE+JpTgj0VCLuag4EQBuAWsRNAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmkeLIzCtJLcpLzFFi42LZdlhJXteslS3NYMtJIYsH87axWdz/2sFo MfXhEzaLva+3sltsenyN1eLyrjlsFjPO72OyaPx4k93ied8+JgdOj02rOtk87lzbw+axeUm9 R9+WVYwenzfJBbBGcdmkpOZklqUW6dslcGXsmPWDuWABX8WhQzsZGxhXc3cxcnJICJhIfJrf zdzFyMUhJLCbUeLS5O2sEAkZieXP+tggbGGJ+y1HWCGKXjJKHDtziQUkwStgJzHh1U2wIhYB VYnv7+8zQcQFJU7OfAJWIyoQLbH68wWwocJA9RN3PGEEsZkFxCVuPZnPBDJUROAao8TaOefB zmAWaGOU+LHnOxPEuomMEt/PfgVbwSagLfF9/WKwUZxAo84uusUCMcpMomtrF9RYeYnmrbOZ JzAKzUJyySwkG2chaZmFpGUBI8sqRsnUguLc9NxkwwLDvNRyveLE3OLSvHS95PzcTYzgeNLS 2MF4b/4/vUOMTByMhxglOJiVRHh3HmVJE+JNSaysSi3Kjy8qzUktPsQozcGiJM5rOGN2ipBA emJJanZqakFqEUyWiYNTqoHJnvFW+9WpOvOOqO5PNV3qfyt2jtByl+3n10e++x/Q2XFar89A QopHKGOBv3vIqh8nT7zaHLxi5Xo7cZfM+wKsZauypHWn3vxSsElm0ebOj+b/o/1nux6Lm6Ay 4VJ4OPfjNa8PSKu77jq3q/jiFP66EOOwlcdnL0q+epzp3LfgPfN+/LxZZ7tC32SmZoCGp1P0 FbHuWNZPvz6o796WqHQl5eSF9vm3V7ycqfn8w8ndh9dfZD13XfHFx+rU0kqGqqzrN8q+6Z2Z erZR5JnlnW9hMlZ/eebnlM4zDAh1z+UO4N+1dc9kphlM9ou39fM1l5pcP155NOLKIZ+TbcYt YdPZX+6JyFWa7DZlwcxcdqu4Y0osxRmJhlrMRcWJAK1zTfEWAwAA X-CMS-MailID: 20240329090910epcas2p2617aec2724c76180d02e80c9ab5e18d3 X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240329090313epcas2p2cf95d22e44b6b1c120021622da68aeb8 References: <20240329085840.65856-1-jaewon02.kim@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240329_020920_933264_815F5CE2 X-CRM114-Status: GOOD ( 24.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Ck9uIDMvMjkvMjQgMTc6NTgsIEphZXdvbiBLaW0gd3JvdGU6Cj4gSWYgdGhlIFNQSSBkYXRhIHNp emUgaXMgc21hbGxlciB0aGFuIEZJRk8sIGl0IG9wZXJhdGVzIGluIFBJTyBtb2RlLAo+IGFuZCBp ZiBpdCBpcyBsYXJnZXIgdGhhbiBGSUZPIHNpemUsIGl0IG9lcmF0ZXMgaW4gRE1BIG1vZGUuCj4K PiBJZiB0aGUgU1BJIGRhdGEgc2l6ZSBpcyBlcXVhbCB0byBmaWZvLCBpdCBvcGVyYXRlcyBpbiBQ SU8gbW9kZSBhbmQgaXQgaXMKPiBzZXBhcmF0ZWQgdG8gMiB0cmFuc2ZlcnMuIFRvIHByZXZlbnQg aXQsIGl0IG11c3Qgb3BlcmF0ZSBpbiBETUEgbW9kZQo+IGZyb20gdGhlIGNhc2Ugd2hlcmUgdGhl IGRhdGEgc2l6ZSBhbmQgdGhlIGZpZm8gc2l6ZSBhcmUgdGhlIHNhbWUuCj4KPiBGaXhlczogMWVl ODA2NzE4ZDVlICgic3BpOiBzM2M2NHh4OiBzdXBwb3J0IGludGVycnVwdCBiYXNlZCBwaW8gbW9k ZSIpCj4gU2lnbmVkLW9mZi1ieTogSmFld29uIEtpbSA8amFld29uMDIua2ltQHNhbXN1bmcuY29t Pgo+IFJldmlld2VkLWJ5OiBTYW0gUHJvdHNlbmtvIDxzZW1lbi5wcm90c2Vua29AbGluYXJvLm9y Zz4KPiAtLS0KPiAgIGRyaXZlcnMvc3BpL3NwaS1zM2M2NHh4LmMgfCA1ICsrLS0tCj4gICAxIGZp bGUgY2hhbmdlZCwgMiBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygtKQo+Cj4gZGlmZiAtLWdp dCBhL2RyaXZlcnMvc3BpL3NwaS1zM2M2NHh4LmMgYi9kcml2ZXJzL3NwaS9zcGktczNjNjR4eC5j Cj4gaW5kZXggOWZjYmUwNDBjYjJmLi5mNzI2ZDg2NzA0MjggMTAwNjQ0Cj4gLS0tIGEvZHJpdmVy cy9zcGkvc3BpLXMzYzY0eHguYwo+ICsrKyBiL2RyaXZlcnMvc3BpL3NwaS1zM2M2NHh4LmMKPiBA QCAtNDMwLDcgKzQzMCw3IEBAIHN0YXRpYyBib29sIHMzYzY0eHhfc3BpX2Nhbl9kbWEoc3RydWN0 IHNwaV9jb250cm9sbGVyICpob3N0LAo+ICAgCXN0cnVjdCBzM2M2NHh4X3NwaV9kcml2ZXJfZGF0 YSAqc2RkID0gc3BpX2NvbnRyb2xsZXJfZ2V0X2RldmRhdGEoaG9zdCk7Cj4gICAKPiAgIAlpZiAo c2RkLT5yeF9kbWEuY2ggJiYgc2RkLT50eF9kbWEuY2gpCj4gLQkJcmV0dXJuIHhmZXItPmxlbiA+ IHNkZC0+Zmlmb19kZXB0aDsKPiArCQlyZXR1cm4geGZlci0+bGVuID49IHNkZC0+Zmlmb19kZXB0 aDsKPiAgIAo+ICAgCXJldHVybiBmYWxzZTsKPiAgIH0KPiBAQCAtODI2LDEwICs4MjYsOSBAQCBz dGF0aWMgaW50IHMzYzY0eHhfc3BpX3RyYW5zZmVyX29uZShzdHJ1Y3Qgc3BpX2NvbnRyb2xsZXIg Kmhvc3QsCj4gICAJCQlyZXR1cm4gc3RhdHVzOwo+ICAgCX0KPiAgIAo+IC0JaWYgKCFpc19wb2xs aW5nKHNkZCkgJiYgKHhmZXItPmxlbiA+IGZpZm9fbGVuKSAmJgo+ICsJaWYgKCFpc19wb2xsaW5n KHNkZCkgJiYgeGZlci0+bGVuID49IGZpZm9fbGVuICYmCj4gICAJICAgIHNkZC0+cnhfZG1hLmNo ICYmIHNkZC0+dHhfZG1hLmNoKSB7Cj4gICAJCXVzZV9kbWEgPSAxOwo+IC0KPiAgIAl9IGVsc2Ug aWYgKHhmZXItPmxlbiA+PSBmaWZvX2xlbikgewo+ICAgCQl0eF9idWYgPSB4ZmVyLT50eF9idWY7 Cj4gICAJCXJ4X2J1ZiA9IHhmZXItPnJ4X2J1ZjsKCgpTb3JyeSwgSSBkaWRuJ3QgYWRkIHYyIGJ5 IG1pc3Rha2UuCgpUaGlzIGlzIHYxIG1haWwgdGhyZWFkLgoKIMKgLSAKaHR0cHM6Ly9sb3JlLmtl cm5lbC5vcmcvbGludXgtYXJtLWtlcm5lbC9DQVBMVys0azRxaDRaWUJ1ZlpvR2JVWk4weXhTRTJY OGJPZGtFUVZ3MVpnOVlVVnBidWdAbWFpbC5nbWFpbC5jb20vVC8KCgpUaGFua3MKCkphZXdvbiBL aW0KCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51 eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVh ZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1h cm0ta2VybmVsCg==