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Sun, 24 Mar 2019 09:23:24 -0700 (PDT) Subject: Re: [RFC PATCH v2 1/5] mtd: cfi_cmdset_0002: Add support for polling status register To: Vignesh Raghavendra , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Rob Herring References: <20190321174548.9288-1-vigneshr@ti.com> <20190321174548.9288-2-vigneshr@ti.com> From: Sergei Shtylyov Organization: Cogent Embedded Message-ID: <597bbe8e-65d3-40c6-5d15-544e962be7c3@cogentembedded.com> Date: Sun, 24 Mar 2019 19:23:23 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20190321174548.9288-2-vigneshr@ti.com> Content-Language: en-MW X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190324_092327_816503_773713D9 X-CRM114-Status: GOOD ( 23.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Arnd Bergmann , tudor.ambarus@microchip.com, Greg Kroah-Hartman , nsekhar@ti.com, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, Mason Yang , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello! On 03/21/2019 08:45 PM, Vignesh Raghavendra wrote: > HyperFlash devices are compliant with CFI AMD/Fujitsu Extended Command > Set(0x0002) for flash operations, therefore drivers/mtd/chips/cfi_cmdset_0002.c > can be use as is. But these devices do not support DQ polling method of > determining chip ready/good status. These flashes provide Status > Register whose bits can be polled to know status of flash operation. > > Cypress HyperFlash datasheet here[1], talks about CFI Amd/Fujitsu > Extended Query version 1.5. Bit 0 of "Software Features supported" field > of CFI Primary Vendor-Specific Extended Query table indicates > presence/absence of status register and Bit 1 indicates whether or not > DQ polling is supported. Using these bits, its possible to determine > whether flash supports DQ polling or need to use Status Register. We need? > Add support for polling status register to know device ready/status of > erase/write operations when DQ polling is not supported. > > [1] https://www.cypress.com/file/213346/download > > Signed-off-by: Vignesh Raghavendra > --- > drivers/mtd/chips/cfi_cmdset_0002.c | 50 +++++++++++++++++++++++++++++ > include/linux/mtd/cfi.h | 5 +++ > 2 files changed, 55 insertions(+) > > diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c > index 72428b6bfc47..29987d8e6c6e 100644 > --- a/drivers/mtd/chips/cfi_cmdset_0002.c > +++ b/drivers/mtd/chips/cfi_cmdset_0002.c [...] > diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h > index cbf77168658c..92ac82ac2329 100644 > --- a/include/linux/mtd/cfi.h > +++ b/include/linux/mtd/cfi.h > @@ -233,6 +233,11 @@ struct cfi_pri_amdstd { > uint8_t VppMin; > uint8_t VppMax; > uint8_t TopBottom; > + /* Below field are added from version 1.5 */ The below fields are. > + uint8_t ProgramSuspend; > + uint8_t UnlockBypass; > + uint8_t SecureSiliconSector; > + uint8_t SoftwareFeatures; > } __packed; > > /* Vendor-Specific PRI for Atmel chips (command set 0x0002) */ > MBR, Sergei _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel