From: Florian Fainelli <f.fainelli@gmail.com> To: Kamal Dasu <kdasu.kdev@gmail.com>, broonie@kernel.org, linux-spi@vger.kernel.org, computersforpeace@gmail.com, linux-mtd@lists.infradead.org, vigneshr@ti.com, yendapally.reddy@broadcom.com Cc: bcm-kernel-feedback-list@broadcom.com, jon.mason@broadcom.com Subject: Re: [PATCH v6, 5/8] mtd: m25p80: Let m25p80_read() fallback to spi transfer Date: Mon, 10 Oct 2016 01:04:08 -0700 [thread overview] Message-ID: <4b3b3d3e-b3f8-1d5b-65e3-0c37b6a29096@gmail.com> (raw) In-Reply-To: <1472076269-4731-6-git-send-email-kdasu.kdev@gmail.com> On 08/24/2016 03:04 PM, Kamal Dasu wrote: > In m25p80_read() even though spi_flash_read() is supported > by some drivers, under certain circumstances like unaligned > buffer, address or address range limitations on certain SoCs > let it fallback to core spi reads. Such drivers are expected > to return -EAGAIN so that the m25p80_read() uses standard > spi transfer. > > Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> MTD folks, any comments on this? > --- > drivers/mtd/devices/m25p80.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c > index 9cf7fcd..77c2d2c 100644 > --- a/drivers/mtd/devices/m25p80.c > +++ b/drivers/mtd/devices/m25p80.c > @@ -155,9 +155,16 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, > msg.data_nbits = m25p80_rx_nbits(nor); > > ret = spi_flash_read(spi, &msg); > - if (ret < 0) > + > + if (ret >= 0) > + return msg.retlen; > + > + /* > + * some spi master drivers might need to fallback to > + * normal spi transfer > + */ > + if (ret != -EAGAIN) > return ret; > - return msg.retlen; > } > > spi_message_init(&m); > -- Florian ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
WARNING: multiple messages have this Message-ID (diff)
From: Florian Fainelli <f.fainelli@gmail.com> To: Kamal Dasu <kdasu.kdev@gmail.com>, broonie@kernel.org, linux-spi@vger.kernel.org, computersforpeace@gmail.com, linux-mtd@lists.infradead.org, vigneshr@ti.com, yendapally.reddy@broadcom.com Cc: bcm-kernel-feedback-list@broadcom.com, jon.mason@broadcom.com Subject: Re: [PATCH v6, 5/8] mtd: m25p80: Let m25p80_read() fallback to spi transfer Date: Mon, 10 Oct 2016 01:04:08 -0700 [thread overview] Message-ID: <4b3b3d3e-b3f8-1d5b-65e3-0c37b6a29096@gmail.com> (raw) In-Reply-To: <1472076269-4731-6-git-send-email-kdasu.kdev@gmail.com> On 08/24/2016 03:04 PM, Kamal Dasu wrote: > In m25p80_read() even though spi_flash_read() is supported > by some drivers, under certain circumstances like unaligned > buffer, address or address range limitations on certain SoCs > let it fallback to core spi reads. Such drivers are expected > to return -EAGAIN so that the m25p80_read() uses standard > spi transfer. > > Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> MTD folks, any comments on this? > --- > drivers/mtd/devices/m25p80.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c > index 9cf7fcd..77c2d2c 100644 > --- a/drivers/mtd/devices/m25p80.c > +++ b/drivers/mtd/devices/m25p80.c > @@ -155,9 +155,16 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, > msg.data_nbits = m25p80_rx_nbits(nor); > > ret = spi_flash_read(spi, &msg); > - if (ret < 0) > + > + if (ret >= 0) > + return msg.retlen; > + > + /* > + * some spi master drivers might need to fallback to > + * normal spi transfer > + */ > + if (ret != -EAGAIN) > return ret; > - return msg.retlen; > } > > spi_message_init(&m); > -- Florian
next prev parent reply other threads:[~2016-10-10 8:04 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-08-24 22:04 [PATCH v6, 0/8] Broadcom stb, and iProc SoC QSPI driver Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-1-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-08-24 22:04 ` [PATCH v6, 1/8] spi: Broadcom BRCMSTB, NSP, NS2 SoC bindings Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-2-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-14 17:16 ` Applied "spi: Broadcom BRCMSTB, NSP, NS2 SoC bindings" to the spi tree Mark Brown 2016-09-14 17:16 ` Mark Brown 2016-08-24 22:04 ` [PATCH v6, 2/8] spi: bcm-qspi: Add Broadcom MSPI driver Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu 2016-08-24 22:04 ` [PATCH v6, 3/8] spi: brcmstb-qspi: Broadcom settop platform driver Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-4-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-14 17:16 ` Applied "spi: brcmstb-qspi: Broadcom settop platform driver" to the spi tree Mark Brown 2016-09-14 17:16 ` Mark Brown 2016-08-24 22:04 ` [PATCH v6, 4/8] spi: bcm-qspi: Add BSPI spi-nor flash controller driver Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-5-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-14 17:16 ` Applied "spi: bcm-qspi: Add BSPI spi-nor flash controller driver" to the spi tree Mark Brown 2016-09-14 17:16 ` Mark Brown 2016-08-24 22:04 ` [PATCH v6, 5/8] mtd: m25p80: Let m25p80_read() fallback to spi transfer Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu 2016-10-10 8:04 ` Florian Fainelli [this message] 2016-10-10 8:04 ` Florian Fainelli [not found] ` <4b3b3d3e-b3f8-1d5b-65e3-0c37b6a29096-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-10-10 8:29 ` Cyrille Pitchen 2016-10-10 8:29 ` Cyrille Pitchen 2016-10-13 21:15 ` Kamal Dasu 2016-10-13 21:15 ` Kamal Dasu 2016-10-14 13:17 ` Cyrille Pitchen 2016-10-14 13:17 ` Cyrille Pitchen [not found] ` <ae2c984e-2bcf-380e-a257-dbe786973af1-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> 2016-11-29 1:32 ` Florian Fainelli 2016-11-29 1:32 ` Florian Fainelli [not found] ` <7697b2fa-4660-c791-e891-a22c8bc5390f-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-11-29 14:06 ` Cyrille Pitchen 2016-11-29 14:06 ` Cyrille Pitchen [not found] ` <a0179d25-71a5-b47f-4272-49aa2a346b54-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> 2016-12-01 15:45 ` Marek Vasut 2016-12-01 15:45 ` Marek Vasut [not found] ` <3260e7e5-fcf1-599a-e7b4-fd7aaef5be2e-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2017-01-20 19:35 ` Kamal Dasu 2017-01-20 19:35 ` Kamal Dasu 2016-08-24 22:04 ` [PATCH v6, 6/8] arm: dts: Add bcm-nsp and bcm958625k support Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-7-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-14 20:33 ` Florian Fainelli 2016-09-14 20:33 ` Florian Fainelli 2016-08-24 22:04 ` [PATCH v6, 7/8] arm64: dts: Add ns2 SoC support Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-8-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-14 20:34 ` Florian Fainelli 2016-09-14 20:34 ` Florian Fainelli 2016-08-24 22:04 ` [PATCH v6, 8/8] spi: iproc-qspi: Add Broadcom iProc SoCs support Kamal Dasu 2016-08-24 22:04 ` Kamal Dasu [not found] ` <1472076269-4731-9-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-15 17:34 ` Florian Fainelli 2016-09-15 17:34 ` Florian Fainelli 2016-09-25 5:59 ` Applied "spi: iproc-qspi: Add Broadcom iProc SoCs support" to the spi tree Mark Brown 2016-09-25 5:59 ` Mark Brown
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