Re: [PATCH v3 6/6] tty/serial: atmel: changed the driver to work under at91-usart mfd

[Radu Pirea]

On 05/25/2018 04:35 PM, Richard Genoud wrote:
> On 25/05/2018 14:17, Radu Pirea wrote:
> > On 05/15/2018 04:14 PM, Richard Genoud wrote:
> > > On 15/05/2018 14:47, Radu Pirea wrote:
> > > > On Mon, 2018-05-14 at 12:57 +0200, Richard Genoud wrote:
> > > > > After your patch, the DMA is not selected anymore:
> > > > > atmel_usart_serial atmel_usart_serial.0.auto: TX channel not
> > > > > available, switch to pio
> > > > > instead of:
> > > > > atmel_usart fffff200.serial: using dma1chan2 for tx DMA transfers
> > > > Fixed.
> > > > > And the kernel doesn't log anymore on the serial console, despite the
> > > > > loglevel=8
> > > > > (after reverting this series, the kernel logs reappears on the serial
> > > > > console)
> > > > Which serial are you using as console?
> > > fffff200.serial (sam9g35-cm)
> > > ( stdout-path = "serial0:115200n8"; in the DTS )
> > >
> > > With this series applied, all the kernel log goes on the screen.
> > > Without, it goes on the serial debug.
> > I tested again with archlinux arm and poky-linux4sam release as distros
> > and kernel log goes on the serial debug. Can you give me more details
> > like cmdline?
> I used kernel 4.17-rc6
> at91_dt_defconfig
> at91sam9g35ek.dtb
>
> Kernel command line: root=/dev/mtdblock1 rw rootfstype=ubifs ubi.mtd=1 root=ubi0:rootfs
I reproduced your issue.
If in cmdline console is not set like this "console=ttyS0,115200", the 
console goes to the lcd.
> ( the one from the DTS )
>
> Detailed instructions:
>
> git checkout v4.17-rc6
> ARCH=arm CROSS_COMPILE=path_to_my_Xchain/arm-linux- LOADADDR=0x20008000 make -j 12 at91_dt_defconfig
> ARCH=arm CROSS_COMPILE=path_to_my_Xchain/arm-linux- LOADADDR=0x20008000 make -j 12 uImage at91sam9g35ek.dtb
> cp arch/arm/boot/uImage arch/arm/boot/dts/at91sam9g35ek.dtb /tftpboot/
>
>  From uboot:
> tftpboot 0x20007FC0 uImage
> tftpboot 0x26400000 at91sam9g35ek.dtb
> bootm 0x20007FC0 - 0x26400000
>
> [ I see the logs on the serial debug ]
>
> git am \[PATCH\ v3\ [1-6]*
>
> ARCH=arm CROSS_COMPILE=path_to_my_Xchain/arm-linux- LOADADDR=0x20008000 make -j 12 uImage at91sam9g35ek.dtb
> cp arch/arm/boot/uImage arch/arm/boot/dts/at91sam9g35ek.dtb /tftpboot/
>
>  From uboot:
> tftpboot 0x20007FC0 uImage
> tftpboot 0x26400000 at91sam9g35ek.dtb
> bootm 0x20007FC0 - 0x26400000
>
> [ I don't see the logs on the serial debug anymore ]
>
>
> > > > > (tests done on sam9g35)
> > > > I will consider the rest of suggestions.
> > > > > regards,
> > > > > Richard