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Tue, 29 May 2018 05:17:45 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20180529051745eusmtrp16e1989759bf2b4f47d129566c24e315b~zBcpLW7dg2034620346eusmtrp1J; Tue, 29 May 2018 05:17:45 +0000 (GMT) X-AuditID: cbfec7f4-713ff700000043e4-51-5b0ce27a0491 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id 42.39.04178.872EC0B5; Tue, 29 May 2018 06:17:44 +0100 (BST) Received: from [106.116.147.30] (unknown [106.116.147.30]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20180529051744eusmtip1220ea8436f10a3efbe31b2715e0f41d0~zBcowVKaz0158701587eusmtip1Z; Tue, 29 May 2018 05:17:44 +0000 (GMT) Subject: Re: Revert "dmaengine: pl330: add DMA_PAUSE feature" To: Vinod Cc: Frank Mori Hess , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Dan Williams , r.baldyga@hackerion.com, Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Linux Samsung SOC From: Marek Szyprowski Date: Tue, 29 May 2018 07:17:44 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180518072112.GG2932@vkoul-mobl> Content-Transfer-Encoding: 7bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrKKsWRmVeSWpSXmKPExsWy7djP87pVj3iiDdY8ELDYOGM9q8X0qRcY LVZP/ctqMf/xXDaL8+c3sFtc3jWHzWLG+X1MFnf/fWK02HnnBLMDp8fOWXfZPY7sPMbmsXjP SyaPTas62Tz6tqxi9Pi8SS6ALYrLJiU1J7MstUjfLoErY9mqlYwFB9kqjn6dy9rA2MPaxcjJ ISFgIrHwyXG2LkYuDiGBFYwSy+c1MEM4XxglHn+/xwLhfGaU6L48iwWmpWHFDmYQW0hgOaPE q0dyEEXvGSUufL4BlhAWsJVo33IKaC4Hh4iAjMS5fdEgNcwCe5kkDl57BVbDJmAo0fW2iw3E ZhFQldj2+xqYLSoQI7Ht8gOwZbwCghInZz4BszkF9CVOb7wMdjezgLzE9rdzmCFscYlbT+Yz gSyQEDjFLnF8xX0WkMW8AmUSr2ZngZgSAi4SD9o5Ie4Xlnh1fAs7hC0jcXpyDwtESbnEvxNZ EOEWRom13/QhbGuJw8cvsoKUMAtoSqzfBRV2lPjRfIYRopNP4sZbQYhb+CQmbZvODBHmleho E4KoVpOYdXwd3M6DFy4xT2BUmoXkw1lIvpqF5KtZCHsXMLKsYhRPLS3OTU8tNspLLdcrTswt Ls1L10vOz93ECExMp/8d/7KDcdefpEOMAhyMSjy8AX+5o4VYE8uKK3MPMUpwMCuJ8Jbu5YkW 4k1JrKxKLcqPLyrNSS0+xCjNwaIkzhunURclJJCeWJKanZpakFoEk2Xi4JRqYMz+teDkWg+X fr/0/WeWvl5g9sdE7+ojkVurdHQ3RvZ9ML6swX3j0bvOzPvXHrrXS5y+9TInuI9nXqOq7xkt frclfc5pIT9LTTZGTmooY1NdvltRa3+1vojuMQv2cpVLbZ4Kipk3llROuOfzt1ZVSezoC6GD 1ZW+81OP+Hv/28igLvx6asfkbiWW4oxEQy3mouJEABd0Sl1IAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrLIsWRmVeSWpSXmKPExsVy+t/xu7oVj3iiDea/tbTYOGM9q8X0qRcY LVZP/ctqMf/xXDaL8+c3sFtc3jWHzWLG+X1MFnf/fWK02HnnBLMDp8fOWXfZPY7sPMbmsXjP SyaPTas62Tz6tqxi9Pi8SS6ALUrPpii/tCRVISO/uMRWKdrQwkjP0NJCz8jEUs/Q2DzWyshU Sd/OJiU1J7MstUjfLkEvY9mqlYwFB9kqjn6dy9rA2MPaxcjJISFgItGwYgdzFyMXh5DAUkaJ GQeXMEMkZCROTmuAKhKW+HOtiw2i6C2jxNyz+5hAEsICthLtW04BJTg4RIAazu2LBqlhFtjL JHFv6V1GiIbnLBLvPy5mA2lgEzCU6HrbBWbzCthJtM3bzwJiswioSmz7fQ0sLioQI7F642V2 iBpBiZMzn4DVcAroS5zeeBnsImYBM4l5mx8yQ9jyEtvfzoGyxSVuPZnPNIFRaBaS9llIWmYh aZmFpGUBI8sqRpHU0uLc9NxiQ73ixNzi0rx0veT83E2MwKjcduzn5h2MlzYGH2IU4GBU4uFd 8Z87Wog1say4MvcQowQHs5IIb+lenmgh3pTEyqrUovz4otKc1OJDjKZAz01klhJNzgcmjLyS eENTQ3MLS0NzY3NjMwslcd7zBpVRQgLpiSWp2ampBalFMH1MHJxSDYzKn+oe2HkJypr42jjx PKzlmPJoxxPm5ujO5ZZK+aoeirwx29a+lS28Ffo7d8/zyYFJjcm6lb9PfNfQuX7klPT+Vx7X osWlThz8WuKW1Tjh2pVJO/cyL/eb4MJg/z0l2uPBFf+aNPeJJu/KQi283VbNiPyhLP9Nm2NV WUXcofPqbxd+yN4XJaXEUpyRaKjFXFScCABLUJ+Z4AIAAA== Message-Id: <20180529051745eucas1p2ee6ec3e34f075d255c87f8f54a626784~zBcpaqmAb1928519285eucas1p2H@eucas1p2.samsung.com> X-CMS-MailID: 20180529051745eucas1p2ee6ec3e34f075d255c87f8f54a626784 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20180518040358epcas2p353b0096d33116ca78a03b16d24569813 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20180518040358epcas2p353b0096d33116ca78a03b16d24569813 References: <06f54061-c537-b399-e493-ec2cdf4def5d@samsung.com> <20180515062144.GC13271@vkoul-mobl> <20180517041946.GQ13271@vkoul-mobl> <20180518040349.GB2932@vkoul-mobl> <7f0b7404-ee12-977f-02a4-a463d1873aee@samsung.com> <20180518072112.GG2932@vkoul-mobl> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vinod, On 2018-05-18 09:21, Vinod wrote: > On 18-05-18, 08:28, Marek Szyprowski wrote: >> Hi Vinod, >> >> Okay, I see that in theory, there are some tricky bits in implementing DMA >> support in UART drivers. On the other hand there are already drivers >> with seems >> to be working fine. This discussion is about revert of the feature >> present in >> pl330 driver, which is required by other in-kernel driver without proper >> fix to >> them. >> >> Can we drop it for now and discuss what and how should be implemented to >> make >> everyone happy, without any regressions? > Sure am dropping the revert, we can always bring it back if it is required This revert is still in your -next branch. Do you plan to update it as well? Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland