* [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-17 12:57 ` Fabien Parent
0 siblings, 0 replies; 8+ messages in thread
From: Fabien Parent @ 2017-01-17 12:57 UTC (permalink / raw)
To: devicetree, linux-arm-kernel, linux-kernel
Cc: khilman, nsekhar, robh+dt, mark.rutland, Fabien Parent
Read access to the SPI flash are broken on da850-evm, i.e. the data
read is not what is actually programmed on the flash.
According to the datasheet for the M25P64 part present on the da850-evm,
if the SPI frequency is higher than 20MHz then the READ command is not
usable anymore and only the FAST_READ command can be used to read data.
This commit specifies in the DTS that we should use FAST_READ command
instead of the READ command.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
---
arch/arm/boot/dts/da850-evm.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index 41de15fe15a2..78492a0bbbab 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -99,6 +99,7 @@
#size-cells = <1>;
compatible = "m25p64";
spi-max-frequency = <30000000>;
+ m25p,fast-read;
reg = <0>;
partition@0 {
label = "U-Boot-SPL";
--
2.11.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-17 12:57 ` Fabien Parent
0 siblings, 0 replies; 8+ messages in thread
From: Fabien Parent @ 2017-01-17 12:57 UTC (permalink / raw)
To: linux-arm-kernel
Read access to the SPI flash are broken on da850-evm, i.e. the data
read is not what is actually programmed on the flash.
According to the datasheet for the M25P64 part present on the da850-evm,
if the SPI frequency is higher than 20MHz then the READ command is not
usable anymore and only the FAST_READ command can be used to read data.
This commit specifies in the DTS that we should use FAST_READ command
instead of the READ command.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
---
arch/arm/boot/dts/da850-evm.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index 41de15fe15a2..78492a0bbbab 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -99,6 +99,7 @@
#size-cells = <1>;
compatible = "m25p64";
spi-max-frequency = <30000000>;
+ m25p,fast-read;
reg = <0>;
partition at 0 {
label = "U-Boot-SPL";
--
2.11.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-18 0:25 ` Kevin Hilman
0 siblings, 0 replies; 8+ messages in thread
From: Kevin Hilman @ 2017-01-18 0:25 UTC (permalink / raw)
To: Fabien Parent
Cc: devicetree, linux-arm-kernel, linux-kernel, nsekhar, robh+dt,
mark.rutland
Fabien Parent <fparent@baylibre.com> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent@baylibre.com>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman@baylibre.com>
Kevin
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-18 0:25 ` Kevin Hilman
0 siblings, 0 replies; 8+ messages in thread
From: Kevin Hilman @ 2017-01-18 0:25 UTC (permalink / raw)
To: Fabien Parent
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, nsekhar-l0cyMroinI0,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8
Fabien Parent <fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Kevin
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^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-18 0:25 ` Kevin Hilman
0 siblings, 0 replies; 8+ messages in thread
From: Kevin Hilman @ 2017-01-18 0:25 UTC (permalink / raw)
To: linux-arm-kernel
Fabien Parent <fparent@baylibre.com> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent@baylibre.com>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman@baylibre.com>
Kevin
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
2017-01-18 0:25 ` Kevin Hilman
(?)
@ 2017-01-18 9:58 ` Sekhar Nori
-1 siblings, 0 replies; 8+ messages in thread
From: Sekhar Nori @ 2017-01-18 9:58 UTC (permalink / raw)
To: Kevin Hilman, Fabien Parent
Cc: devicetree, linux-arm-kernel, linux-kernel, robh+dt, mark.rutland
On Wednesday 18 January 2017 05:55 AM, Kevin Hilman wrote:
> Fabien Parent <fparent@baylibre.com> writes:
>
>> Read access to the SPI flash are broken on da850-evm, i.e. the data
>> read is not what is actually programmed on the flash.
>> According to the datasheet for the M25P64 part present on the da850-evm,
>> if the SPI frequency is higher than 20MHz then the READ command is not
>> usable anymore and only the FAST_READ command can be used to read data.
>>
>> This commit specifies in the DTS that we should use FAST_READ command
>> instead of the READ command.
>>
>> Signed-off-by: Fabien Parent <fparent@baylibre.com>
>
> Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
> functionatliy in line with the legacy (board-file) boot.
>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
Applied with Kevin's Tested-by and also marked for stable. Sending pull
request for v4.10-rc shortly.
Thanks,
Sekhar
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-18 9:58 ` Sekhar Nori
0 siblings, 0 replies; 8+ messages in thread
From: Sekhar Nori @ 2017-01-18 9:58 UTC (permalink / raw)
To: Kevin Hilman, Fabien Parent
Cc: mark.rutland, devicetree, robh+dt, linux-kernel, linux-arm-kernel
On Wednesday 18 January 2017 05:55 AM, Kevin Hilman wrote:
> Fabien Parent <fparent@baylibre.com> writes:
>
>> Read access to the SPI flash are broken on da850-evm, i.e. the data
>> read is not what is actually programmed on the flash.
>> According to the datasheet for the M25P64 part present on the da850-evm,
>> if the SPI frequency is higher than 20MHz then the READ command is not
>> usable anymore and only the FAST_READ command can be used to read data.
>>
>> This commit specifies in the DTS that we should use FAST_READ command
>> instead of the READ command.
>>
>> Signed-off-by: Fabien Parent <fparent@baylibre.com>
>
> Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
> functionatliy in line with the legacy (board-file) boot.
>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
Applied with Kevin's Tested-by and also marked for stable. Sending pull
request for v4.10-rc shortly.
Thanks,
Sekhar
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
@ 2017-01-18 9:58 ` Sekhar Nori
0 siblings, 0 replies; 8+ messages in thread
From: Sekhar Nori @ 2017-01-18 9:58 UTC (permalink / raw)
To: linux-arm-kernel
On Wednesday 18 January 2017 05:55 AM, Kevin Hilman wrote:
> Fabien Parent <fparent@baylibre.com> writes:
>
>> Read access to the SPI flash are broken on da850-evm, i.e. the data
>> read is not what is actually programmed on the flash.
>> According to the datasheet for the M25P64 part present on the da850-evm,
>> if the SPI frequency is higher than 20MHz then the READ command is not
>> usable anymore and only the FAST_READ command can be used to read data.
>>
>> This commit specifies in the DTS that we should use FAST_READ command
>> instead of the READ command.
>>
>> Signed-off-by: Fabien Parent <fparent@baylibre.com>
>
> Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
> functionatliy in line with the legacy (board-file) boot.
>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
Applied with Kevin's Tested-by and also marked for stable. Sending pull
request for v4.10-rc shortly.
Thanks,
Sekhar
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2017-01-18 9:59 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-01-17 12:57 [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash Fabien Parent
2017-01-17 12:57 ` Fabien Parent
2017-01-18 0:25 ` Kevin Hilman
2017-01-18 0:25 ` Kevin Hilman
2017-01-18 0:25 ` Kevin Hilman
2017-01-18 9:58 ` Sekhar Nori
2017-01-18 9:58 ` Sekhar Nori
2017-01-18 9:58 ` Sekhar Nori
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