[U-Boot] [PATCH RESEND 0/7] spi: cadence_qspi: optimize & fix indirect rd-writes

[Stefan Roese <sr@denx.de>]

Hi Vikas,

I finally got to testing your latest patchset. And have
some comments / problems:

On 17.06.2015 04:14, Vikas Manocha wrote:
> This patchset:
> - removes sram polling while reading/writing from flash.
> - fixes trigger base & transfer start address register programming. This fix
> superseeds the previous patch "spi: cadence_qspi: Fix the indirect ahb trigger
> address setting"
> - adds support to get fifo width from device tree
> 
> Vikas Manocha (7):
>    spi: cadence_qspi: remove sram polling from flash read
>    spi: cadence_qspi: read can be independent of fifo width
>    spi: cadence_qspi: remove sram polling from flash write
>    spi: cadence_qspi: move trigger base configuration in init
>    spi: cadence_qspi: fix indirect read/write start address
>    spi: cadence_qspi: fix base trigger address & transfer start address
>    spi: cadence_qspi: get fifo width from device tree
> 
>   arch/arm/dts/socfpga.dtsi      |    2 +
>   arch/arm/dts/stv0991.dts       |    4 +-
>   drivers/spi/cadence_qspi.c     |   14 ++--
>   drivers/spi/cadence_qspi.h     |    6 +-
>   drivers/spi/cadence_qspi_apb.c |  140 ++++++++++------------------------------
>   5 files changed, 50 insertions(+), 116 deletions(-)

With these patches applied, I see this compilation error:

$ make -s -j10
Error: arch/arm/dts/socfpga.dtsi:637.5-6 syntax error
FATAL ERROR: Unable to parse input tree
Error: arch/arm/dts/socfpga.dtsi:637.5-6 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [arch/arm/dts/socfpga_arria5_socdk.dtb] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [arch/arm/dts/socfpga_cyclone5_socdk.dtb] Error 1
Error: arch/arm/dts/socfpga.dtsi:637.5-6 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [arch/arm/dts/socfpga_cyclone5_socrates.dtb] Error 1

The socfpga.dtsi has incorrect syntax. Here a quick fix for this -
please add this to your next version. And please also compile-test
for e.g. socrates.

$ gd
diff --git a/arch/arm/dts/socfpga.dtsi b/arch/arm/dts/socfpga.dtsi
index a2a2029..448870e 100644
--- a/arch/arm/dts/socfpga.dtsi
+++ b/arch/arm/dts/socfpga.dtsi
@@ -633,8 +633,8 @@
                        #address-cells = <1>;
                        #size-cells = <0>;
                        reg = <0xff705000 0x1000>,
-                               <0xffa00000 0x1000>;
-                               <0x00000000 0x0010>;
+                             <0xffa00000 0x1000>,
+                             <0x00000000 0x0010>;
                        interrupts = <0 151 4>;
                        clocks = <&qspi_clk>;
                        ext-decoder = <0>;  /* external decoder */


Okay. After installing the resulting image on the SoCrates, I get
the following error while reading from SD-card:

=> sf probe
SF: Detected N25Q256 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
SF: Warning - Only lower 16MiB accessible, Full access #define CONFIG_SPI_FLASH_BAR
=> sf read 100000 0 100000
QSPI: indirect completion status error with reg 0x0000000c
SF: 1048576 bytes @ 0x0 Read: ERROR

So there seems to be something breaking the SoCFPGA Cadence
QSPI support. Any idea whats going wrong here?

Thanks,
Stefan