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[91.78.208.152]) by smtp.googlemail.com with ESMTPSA id u4sm11718887ljj.44.2020.04.07.07.47.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Apr 2020 07:47:08 -0700 (PDT) Subject: Re: [PATCH v10 43/55] dt-bindings: input: atmel: support to set max bytes transferred To: "Wang, Jiada" , nick@shmanahar.org, dmitry.torokhov@gmail.com, jikos@kernel.org, benjamin.tissoires@redhat.com, bsz@semihalf.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, erosca@de.adit-jv.com, Andrew_Gabbasov@mentor.com References: <20200331105051.58896-1-jiada_wang@mentor.com> <20200331105051.58896-44-jiada_wang@mentor.com> <9b98a3fc-b7ee-fc01-dc5c-248df507d4a2@mentor.com> From: Dmitry Osipenko Message-ID: <008d019c-2de7-4fe4-0c22-2668312f808b@gmail.com> Date: Tue, 7 Apr 2020 17:47:07 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <9b98a3fc-b7ee-fc01-dc5c-248df507d4a2@mentor.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org 07.04.2020 12:27, Wang, Jiada пишет: .. >> Is this a software (firmware) limitation which varies from version to >> version? >> > > the timeout issue trying to be addressed in this patch is from software, > one of our board a Serializer/Deserializer bridge exists between the SoC > (imx6) and the Atmel touch controller. > imx6 i2c controller driver has a timeout value(100ms) for each i2c > transaction, > Large i2c read transaction failed to complete within this timeout value > and therefore imx6 i2c controller driver aborts the transaction > and returns failure. > > Therefore this patch was created to split the large i2c transaction into > smaller chunks which can complete > within the timeout defined by i2c controller driver. Isn't it possible to use the max_read/write_len of the generic struct i2c_adapter_quirks for limiting the transfer size? BTW, it looks like the i.MX I2C driver doesn't specify the i2c_adapter_quirks, which probably needs to be fixed.