Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Tue, Jan 10, 2017 at 10:33 PM, Clemens Gruber wrote: > Hi Fabio, > > On Sun, Jan 08, 2017 at 07:46:29PM -0200, Fabio Estevam wrote: >> > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) >> >> Mine is a mx6solo rev1.1. > > Could it

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Tue, Jan 10, 2017 at 10:33 PM, Clemens Gruber wrote: > Hi Fabio, > > On Sun, Jan 08, 2017 at 07:46:29PM -0200, Fabio Estevam wrote: >> > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) >> >> Mine is a mx6solo rev1.1. > > Could it be dependent upon SMP? Do you

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sun, Jan 08, 2017 at 07:46:29PM -0200, Fabio Estevam wrote: > > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) > > Mine is a mx6solo rev1.1. Could it be dependent upon SMP? Do you have an i.MX6Q board around to try? -- I made a few interesting discoveries

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sun, Jan 08, 2017 at 07:46:29PM -0200, Fabio Estevam wrote: > > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) > > Mine is a mx6solo rev1.1. Could it be dependent upon SMP? Do you have an i.MX6Q board around to try? -- I made a few interesting discoveries

Re: imx: RS-485 problems during TX, maybe DMA related

On Sun, Jan 8, 2017 at 4:06 PM, Clemens Gruber wrote: > I just did the experiment with your configuration and the rs485conf tool > you mentioned. > But still, no luck :( > > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) Mine is a mx6solo

Re: imx: RS-485 problems during TX, maybe DMA related

On Sun, Jan 8, 2017 at 4:06 PM, Clemens Gruber wrote: > I just did the experiment with your configuration and the rs485conf tool > you mentioned. > But still, no luck :( > > What's the revision of the i.MX6Q on your board? Mine is 1.5 (TO 1.3) Mine is a mx6solo rev1.1. > Another example: If I

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sun, Jan 08, 2017 at 12:30:24AM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber > wrote: > > > Just remuxed GPIO signals to these pads, applied your two patches and > > used rts-gpios in the DT but I still

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sun, Jan 08, 2017 at 12:30:24AM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber > wrote: > > > Just remuxed GPIO signals to these pads, applied your two patches and > > used rts-gpios in the DT but I still see the same problem :/ > > >

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber wrote: > Just remuxed GPIO signals to these pads, applied your two patches and > used rts-gpios in the DT but I still see the same problem :/ As you have tested my 'rts-gpios' patches, would it be possible

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber wrote: > Just remuxed GPIO signals to these pads, applied your two patches and > used rts-gpios in the DT but I still see the same problem :/ As you have tested my 'rts-gpios' patches, would it be possible to reply with your Tested-by

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber wrote: > Just remuxed GPIO signals to these pads, applied your two patches and > used rts-gpios in the DT but I still see the same problem :/ > > When transmit something, I get doubled characters, then zeros

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 9:06 PM, Clemens Gruber wrote: > Just remuxed GPIO signals to these pads, applied your two patches and > used rts-gpios in the DT but I still see the same problem :/ > > When transmit something, I get doubled characters, then zeros and at the > end garbled

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sat, Jan 07, 2017 at 07:43:48PM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Sat, Jan 7, 2017 at 6:59 PM, Clemens Gruber > wrote: > > > Great! > > > > Did you observe the same effect I described, with the doubling of > > characters in the front and

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sat, Jan 07, 2017 at 07:43:48PM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Sat, Jan 7, 2017 at 6:59 PM, Clemens Gruber > wrote: > > > Great! > > > > Did you observe the same effect I described, with the doubling of > > characters in the front and the leftovers from previous

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 6:59 PM, Clemens Gruber wrote: > Great! > > Did you observe the same effect I described, with the doubling of > characters in the front and the leftovers from previous transmissions at > the end? No, I don't observe these errors

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 6:59 PM, Clemens Gruber wrote: > Great! > > Did you observe the same effect I described, with the doubling of > characters in the front and the leftovers from previous transmissions at > the end? No, I don't observe these errors when I use 'rts-gpios' in the

Re: imx: RS-485 problems during TX, maybe DMA related

On Sat, Jan 07, 2017 at 02:48:03PM -0200, Fabio Estevam wrote: > On Sat, Jan 7, 2017 at 1:34 PM, Clemens Gruber > wrote: > > Hi Fabio, > > > > On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: > >> The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only

Re: imx: RS-485 problems during TX, maybe DMA related

On Sat, Jan 07, 2017 at 02:48:03PM -0200, Fabio Estevam wrote: > On Sat, Jan 7, 2017 at 1:34 PM, Clemens Gruber > wrote: > > Hi Fabio, > > > > On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: > >> The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. > > > > Ah,

Re: imx: RS-485 problems during TX, maybe DMA related

On Sat, Jan 7, 2017 at 1:34 PM, Clemens Gruber wrote: > Hi Fabio, > > On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: >> The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. > > Ah, the input select is limited in that way, I see. > >

Re: imx: RS-485 problems during TX, maybe DMA related

On Sat, Jan 7, 2017 at 1:34 PM, Clemens Gruber wrote: > Hi Fabio, > > On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: >> The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. > > Ah, the input select is limited in that way, I see. > > You wrote that you tried

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: > The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. Ah, the input select is limited in that way, I see. You wrote that you tried rts-gpios. What about setting cts-gpios to gpio6 2 in the DT? Or can

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Sat, Jan 07, 2017 at 12:57:10PM -0200, Fabio Estevam wrote: > The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. Ah, the input select is limited in that way, I see. You wrote that you tried rts-gpios. What about setting cts-gpios to gpio6 2 in the DT? Or can

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 11:45 AM, Clemens Gruber wrote: > It should work like this, I don't think using an extra GPIO is > necessary. The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. If I pass 'fsl,dte-mode' then I can see this

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Sat, Jan 7, 2017 at 11:45 AM, Clemens Gruber wrote: > It should work like this, I don't think using an extra GPIO is > necessary. The MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B option is only valid in dte mode. If I pass 'fsl,dte-mode' then I can see this pin toggling. (rx, tx would

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Fri, Jan 06, 2017 at 10:31:16PM -0200, Fabio Estevam wrote: > Yes, I have tried like this: > > { > pinctrl-names = "default"; > pinctrl-0 = <_uart4>; > uart-has-rtscts; > status = "okay"; > }; > > pinctrl_uart4: uart4grp { > fsl,pins = < >

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Fri, Jan 06, 2017 at 10:31:16PM -0200, Fabio Estevam wrote: > Yes, I have tried like this: > > { > pinctrl-names = "default"; > pinctrl-0 = <_uart4>; > uart-has-rtscts; > status = "okay"; > }; > > pinctrl_uart4: uart4grp { > fsl,pins = < >

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Fri, Jan 6, 2017 at 8:50 PM, Clemens Gruber wrote: > But according to the i.MX Pins tool, they can be muxed vice-versa too. > So if you connected the transceiver-enable to ball L4 (CSI0_DAT16), you > could mux MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B and >

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Fri, Jan 6, 2017 at 8:50 PM, Clemens Gruber wrote: > But according to the i.MX Pins tool, they can be muxed vice-versa too. > So if you connected the transceiver-enable to ball L4 (CSI0_DAT16), you > could mux MX6QDL_PAD_CSI0_DAT16__UART4_CTS_B and >

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Fri, Jan 06, 2017 at 07:22:32PM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Wed, Jan 4, 2017 at 2:00 PM, Clemens Gruber > wrote: > > Hi, > > > > I observed odd behavior of the current tty/serial/imx.c driver in RS-485 > > mode. > > > > RX works

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Fabio, On Fri, Jan 06, 2017 at 07:22:32PM -0200, Fabio Estevam wrote: > Hi Clemens, > > On Wed, Jan 4, 2017 at 2:00 PM, Clemens Gruber > wrote: > > Hi, > > > > I observed odd behavior of the current tty/serial/imx.c driver in RS-485 > > mode. > > > > RX works fine, but TX does not: When

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Wed, Jan 4, 2017 at 2:00 PM, Clemens Gruber wrote: > Hi, > > I observed odd behavior of the current tty/serial/imx.c driver in RS-485 > mode. > > RX works fine, but TX does not: When sending data, it arrives multiple I am also trying to get rs485 in

Re: imx: RS-485 problems during TX, maybe DMA related

Hi Clemens, On Wed, Jan 4, 2017 at 2:00 PM, Clemens Gruber wrote: > Hi, > > I observed odd behavior of the current tty/serial/imx.c driver in RS-485 > mode. > > RX works fine, but TX does not: When sending data, it arrives multiple I am also trying to get rs485 in half-duplex mode to work on

imx: RS-485 problems during TX, maybe DMA related

Hi, I observed odd behavior of the current tty/serial/imx.c driver in RS-485 mode. RX works fine, but TX does not: When sending data, it arrives multiple times and with data from previous transmissions at the end, after a delay. # My setup Hardware: i.MX6Q board with UARTn_RX_DATA, _TX_DATA

imx: RS-485 problems during TX, maybe DMA related

Hi, I observed odd behavior of the current tty/serial/imx.c driver in RS-485 mode. RX works fine, but TX does not: When sending data, it arrives multiple times and with data from previous transmissions at the end, after a delay. # My setup Hardware: i.MX6Q board with UARTn_RX_DATA, _TX_DATA