[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[sayotte.tyco at gmail.com]

From: Stephane Ayotte <sayotte@tycoint.com>

This patch adds an option to skip the registration of LCD stdio ouput for
boards that want to show different text on LCD than on serial output (or
the active stdout selected by the environment variable).

Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>
---

This implementation is similar to what has been added to cfb_console.c by
Stefan Roese <sr@denx.de> per commit 6cc7ba9e on 05/15/2009

I am sending this patch using <sayotte.tyco@gmail.com>
as our regular smtp server <sayotte@tycoint.com> causes patch issues.

 common/lcd.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/common/lcd.c b/common/lcd.c
index d29308a..ed68be9 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -143,6 +143,16 @@ __weak int lcd_get_size(int *line_length)
 	return *line_length * panel_info.vl_row;
 }
 
+/*
+ * Implement a weak default function for boards that optionally
+ * need to skip the lcd console initialization.
+ */
+__weak int board_lcd_console_skip(void)
+{
+	/* As default, don't skip cfb init */
+	return 0;
+}
+
 int drv_lcd_init(void)
 {
 	struct stdio_dev lcddev;
@@ -152,6 +162,9 @@ int drv_lcd_init(void)
 
 	lcd_init(lcd_base);
 
+	if (board_lcd_console_skip())
+		return 0;
+
 	/* Device initialization */
 	memset(&lcddev, 0, sizeof(lcddev));
 
-- 
1.8.3.1

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Stephane Ayotte]

Hello Anatolij,

Does this patch have a chance to get to the release even if it has missed
RC1?

Thanks,

Stephane

On Tue, Nov 3, 2015 at 11:14 AM, <sayotte.tyco@gmail.com> wrote:

> From: Stephane Ayotte <sayotte@tycoint.com>
>
> This patch adds an option to skip the registration of LCD stdio ouput for
> boards that want to show different text on LCD than on serial output (or
> the active stdout selected by the environment variable).
>
> Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>
> ---
>
> This implementation is similar to what has been added to cfb_console.c by
> Stefan Roese <sr@denx.de> per commit 6cc7ba9e on 05/15/2009
>
> I am sending this patch using <sayotte.tyco@gmail.com>
> as our regular smtp server <sayotte@tycoint.com> causes patch issues.
>
>  common/lcd.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/common/lcd.c b/common/lcd.c
> index d29308a..ed68be9 100644
> --- a/common/lcd.c
> +++ b/common/lcd.c
> @@ -143,6 +143,16 @@ __weak int lcd_get_size(int *line_length)
>         return *line_length * panel_info.vl_row;
>  }
>
> +/*
> + * Implement a weak default function for boards that optionally
> + * need to skip the lcd console initialization.
> + */
> +__weak int board_lcd_console_skip(void)
> +{
> +       /* As default, don't skip cfb init */
> +       return 0;
> +}
> +
>  int drv_lcd_init(void)
>  {
>         struct stdio_dev lcddev;
> @@ -152,6 +162,9 @@ int drv_lcd_init(void)
>
>         lcd_init(lcd_base);
>
> +       if (board_lcd_console_skip())
> +               return 0;
> +
>         /* Device initialization */
>         memset(&lcddev, 0, sizeof(lcddev));
>
> --
> 1.8.3.1
>
>

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Anatolij Gustschin]

Hello Stephane,

On Thu, 19 Nov 2015 08:41:44 -0500
Stephane Ayotte <sayotte.tyco@gmail.com> wrote:
...
> Does this patch have a chance to get to the release even if it has missed
> RC1?

yes, I've queued it in my tree.

Thanks,

Anatolij

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Anatolij Gustschin]

On Tue,  3 Nov 2015 11:14:49 -0500
sayotte.tyco at gmail.com wrote:

> From: Stephane Ayotte <sayotte@tycoint.com>
> 
> This patch adds an option to skip the registration of LCD stdio ouput for
> boards that want to show different text on LCD than on serial output (or
> the active stdout selected by the environment variable).
> 
> Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>
> ---
> 
> This implementation is similar to what has been added to cfb_console.c by
> Stefan Roese <sr@denx.de> per commit 6cc7ba9e on 05/15/2009
> 
> I am sending this patch using <sayotte.tyco@gmail.com>
> as our regular smtp server <sayotte@tycoint.com> causes patch issues.
> 
>  common/lcd.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

applied to u-boot-video/master, thanks!

Anatolij

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Hannes Schmelzer]

hi,

sorry i was absent a few days from u-boot (writing vxWorks drivers :-() ...

but, do we really need this ?

i had same problem on my b&r boards, were we printout something on lcd 
but console should remain on stdout/stdin.

what about:

int overwrite_console(void)
{
     return 1;
}

and activate
#define CONFIG_SYS_CONSOLE_IS_IN_ENV
#define CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE

should do the same i think.

best regards,
Hannes

On 2015-11-19 21:54, Anatolij Gustschin wrote:
> On Tue,  3 Nov 2015 11:14:49 -0500
> sayotte.tyco at gmail.com wrote:
>
>> From: Stephane Ayotte <sayotte@tycoint.com>
>>
>> This patch adds an option to skip the registration of LCD stdio ouput for
>> boards that want to show different text on LCD than on serial output (or
>> the active stdout selected by the environment variable).
>>
>> Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>
>> ---
>>
>> This implementation is similar to what has been added to cfb_console.c by
>> Stefan Roese <sr@denx.de> per commit 6cc7ba9e on 05/15/2009
>>
>> I am sending this patch using <sayotte.tyco@gmail.com>
>> as our regular smtp server <sayotte@tycoint.com> causes patch issues.
>>
>>   common/lcd.c | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
> applied to u-boot-video/master, thanks!
>
> Anatolij
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>
>

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Ayotte, Stephane]

Thanks for the info, Hannes. I agree with you that I could have met my requirements (of showing  "applicative" output to the LCD and "technical/debug" output to the serial port) with CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE. To be totally honest, I had not seen this config and was attracted to how the video device did it.

For the sake of argumentation only, I will raise the question whether CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE breaks NETCONSOLE. If I understand correctly, this config will force the console to use only the serial device. I could imagine use cases for netconsole and LCD.

I'm asking the question, really, as this is just from my reading of the code. I haven't tested with netconsole.

My feeling is that there should be a more generic way of saying whether a device should register to stdio or not. My preference would go to an API over individual configs for each device. Neither of the two solutions are ideal nor completely implemented as this time.

Anatolij, based on Hannes info, if you want to backtrack on this, I'm open both ways.

Thanks,
Stephane
________________________________________
From: U-Boot [u-boot-bounces at lists.denx.de] on behalf of Hannes Schmelzer [hannes at schmelzer.or.at]
Sent: Tuesday, December 01, 2015 12:41 PM
To: Anatolij Gustschin; sayotte.tyco at gmail.com
Cc: u-boot at lists.denx.de; trini at konsulko.com
Subject: Re: [U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

hi,

sorry i was absent a few days from u-boot (writing vxWorks drivers :-() ...

but, do we really need this ?

i had same problem on my b&r boards, were we printout something on lcd
but console should remain on stdout/stdin.

what about:

int overwrite_console(void)
{
     return 1;
}

and activate
#define CONFIG_SYS_CONSOLE_IS_IN_ENV
#define CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE

should do the same i think.

best regards,
Hannes

On 2015-11-19 21:54, Anatolij Gustschin wrote:
> On Tue,  3 Nov 2015 11:14:49 -0500
> sayotte.tyco at gmail.com wrote:
>
>> From: Stephane Ayotte <sayotte@tycoint.com>
>>
>> This patch adds an option to skip the registration of LCD stdio ouput for
>> boards that want to show different text on LCD than on serial output (or
>> the active stdout selected by the environment variable).
>>
>> Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>
>> ---
>>
>> This implementation is similar to what has been added to cfb_console.c by
>> Stefan Roese <sr@denx.de> per commit 6cc7ba9e on 05/15/2009
>>
>> I am sending this patch using <sayotte.tyco@gmail.com>
>> as our regular smtp server <sayotte@tycoint.com> causes patch issues.
>>
>>   common/lcd.c | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
> applied to u-boot-video/master, thanks!
>
> Anatolij
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.denx.de_mailman_listinfo_u-2Dboot&d=CwICAg&c=0YGvTs3tT-VMy8_v51yLDw&r=hKJIzptToavgYbbj9AV421mE6NXayrpl14-njwOHYSQ&m=DfAFsiSn9H0bgqbWZfUz1Iy4i-sN_4cLdZO3S4ZZwv0&s=evCiUq3rZQa24tuFptK6hotCqAjw7TISa5RrShNqBxw&e=
>
>

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[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Hannes Schmelzer]

On 12/01/2015 10:31 PM, Ayotte, Stephane wrote:

Hi Stephane,
> Thanks for the info, Hannes. I agree with you that I could have met my requirements (of showing  "applicative" output to the LCD and "technical/debug" output to the serial port) with CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE. To be totally honest, I had not seen this config and was attracted to how the video device did it.
>
> For the sake of argumentation only, I will raise the question whether CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE breaks NETCONSOLE. If I understand correctly, this config will force the console to use only the serial device. I could imagine use cases for netconsole and LCD.
>
> I'm asking the question, really, as this is just from my reading of the code. I haven't tested with netconsole.
I also read the code again and my understanding is.
First the environment is asked for stdin, stdout, stderr devices - 
afterwards overwrite_console is asked how about searching for some other 
devices.
If overwrite_console returns != 0 the devs inputdev,outputdev,errdev are 
left uninitialized / values from environment (see line 802...805 in 
common/console.c).

A few lines afterwards the fallback takes care about if NULL and assigns 
"serial" to them.

So there is no indication for me breaking netconsole.
Further i'm also using netconsole on my B&R boards, its working fine.
> My feeling is that there should be a more generic way of saying whether a device should register to stdio or not. My preference would go to an API over individual configs for each device. Neither of the two solutions are ideal nor completely implemented as this time.
>
> Anatolij, based on Hannes info, if you want to backtrack on this, I'm open both ways.
I would suggest to have not too much ways for one goal. Maybe it would 
be enough work a bit on documentation how to quiet console on LCD.
> Thanks,
> Stephane
best regards,
Hannes
> ________________________________________
> From: U-Boot [u-boot-bounces at lists.denx.de] on behalf of Hannes Schmelzer [hannes at schmelzer.or.at]
> Sent: Tuesday, December 01, 2015 12:41 PM
> To: Anatolij Gustschin; sayotte.tyco at gmail.com
> Cc: u-boot at lists.denx.de; trini at konsulko.com
> Subject: Re: [U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output
>
> hi,
>
> sorry i was absent a few days from u-boot (writing vxWorks drivers :-() ...
>
> but, do we really need this ?
>
> i had same problem on my b&r boards, were we printout something on lcd
> but console should remain on stdout/stdin.
>
> what about:
>
> int overwrite_console(void)
> {
>       return 1;
> }
>
> and activate
> #define CONFIG_SYS_CONSOLE_IS_IN_ENV
> #define CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
>
> should do the same i think.
>
> best regards,
> Hannes
>

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Ayotte, Stephane]

On December-02-15 12:30 AM, Hannes Schmelzer wrote:

> On 12/01/2015 10:31 PM, Ayotte, Stephane wrote:
>
> Hi Stephane,
> > Thanks for the info, Hannes. I agree with you that I could have met my
> requirements (of showing  "applicative" output to the LCD and
> "technical/debug" output to the serial port) with
> CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE. To be totally honest, I had not
> seen this config and was attracted to how the video device did it.
> >
> > For the sake of argumentation only, I will raise the question whether
> CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE breaks NETCONSOLE. If I
> understand correctly, this config will force the console to use only the serial
> device. I could imagine use cases for netconsole and LCD.
> >
> > I'm asking the question, really, as this is just from my reading of the code. I
> haven't tested with netconsole.
> I also read the code again and my understanding is.
> First the environment is asked for stdin, stdout, stderr devices - afterwards
> overwrite_console is asked how about searching for some other devices.
> If overwrite_console returns != 0 the devs inputdev,outputdev,errdev are left
> uninitialized / values from environment (see line 802...805 in
> common/console.c).
>
> A few lines afterwards the fallback takes care about if NULL and assigns "serial"
> to them.
>
> So there is no indication for me breaking netconsole.
> Further i'm also using netconsole on my B&R boards, its working fine.

Thanks for the clarification. In that case, you are right that we end up with two different solutions.
It's too bad your clarification came just a little after the pull request.

> > My feeling is that there should be a more generic way of saying whether a
> device should register to stdio or not. My preference would go to an API over
> individual configs for each device. Neither of the two solutions are ideal nor
> completely implemented as this time.
> >
> > Anatolij, based on Hannes info, if you want to backtrack on this, I'm open both
> ways.
> I would suggest to have not too much ways for one goal. Maybe it would be
> enough work a bit on documentation how to quiet console on LCD.

I agree with you 100% on not having multiple ways. What would be the procedure at this point?
Submit a reverse patch?

Regards,
Stephane

> > Thanks,
> > Stephane
> best regards,
> Hannes
> > ________________________________________
> > From: U-Boot [u-boot-bounces at lists.denx.de] on behalf of Hannes
> > Schmelzer [hannes at schmelzer.or.at]
> > Sent: Tuesday, December 01, 2015 12:41 PM
> > To: Anatolij Gustschin; sayotte.tyco at gmail.com
> > Cc: u-boot at lists.denx.de; trini at konsulko.com
> > Subject: Re: [U-Boot] [PATCH] LCD: Add an option to skip registration
> > as an stdio output
> >
> > hi,
> >
> > sorry i was absent a few days from u-boot (writing vxWorks drivers :-() ...
> >
> > but, do we really need this ?
> >
> > i had same problem on my b&r boards, were we printout something on lcd
> > but console should remain on stdout/stdin.
> >
> > what about:
> >
> > int overwrite_console(void)
> > {
> >       return 1;
> > }
> >
> > and activate
> > #define CONFIG_SYS_CONSOLE_IS_IN_ENV
> > #define CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
> >
> > should do the same i think.
> >
> > best regards,
> > Hannes
> >


________________________________

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[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Hannes Schmelzer]

On 12/02/2015 03:08 PM, Ayotte, Stephane wrote:
> On December-02-15 12:30 AM, Hannes Schmelzer wrote:
>
>> On 12/01/2015 10:31 PM, Ayotte, Stephane wrote:
>>
>> Hi Stephane,
>>> Thanks for the info, Hannes. I agree with you that I could have met my
>> requirements (of showing  "applicative" output to the LCD and
>> "technical/debug" output to the serial port) with
>> CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE. To be totally honest, I had not
>> seen this config and was attracted to how the video device did it.
>>> For the sake of argumentation only, I will raise the question whether
>> CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE breaks NETCONSOLE. If I
>> understand correctly, this config will force the console to use only the serial
>> device. I could imagine use cases for netconsole and LCD.
>>> I'm asking the question, really, as this is just from my reading of the code. I
>> haven't tested with netconsole.
>> I also read the code again and my understanding is.
>> First the environment is asked for stdin, stdout, stderr devices - afterwards
>> overwrite_console is asked how about searching for some other devices.
>> If overwrite_console returns != 0 the devs inputdev,outputdev,errdev are left
>> uninitialized / values from environment (see line 802...805 in
>> common/console.c).
>>
>> A few lines afterwards the fallback takes care about if NULL and assigns "serial"
>> to them.
>>
>> So there is no indication for me breaking netconsole.
>> Further i'm also using netconsole on my B&R boards, its working fine.
> Thanks for the clarification. In that case, you are right that we end up with two different solutions.
> It's too bad your clarification came just a little after the pull request.
>
>>> My feeling is that there should be a more generic way of saying whether a
>> device should register to stdio or not. My preference would go to an API over
>> individual configs for each device. Neither of the two solutions are ideal nor
>> completely implemented as this time.
>>> Anatolij, based on Hannes info, if you want to backtrack on this, I'm open both
>> ways.
>> I would suggest to have not too much ways for one goal. Maybe it would be
>> enough work a bit on documentation how to quiet console on LCD.
> I agree with you 100% on not having multiple ways. What would be the procedure at this point?
> Submit a reverse patch?
i would suggest reverting the commit and send some patch with the revert.
What do Anatolij or Tom say?
>
> Regards,
> Stephane
best regards,
Hannes

[U-Boot] [PATCH] LCD: Add an option to skip registration as an stdio output

[Anatolij Gustschin]

Hi,

On Wed, 2 Dec 2015 14:08:16 +0000
"Ayotte, Stephane" <sayotte@tycoint.com> wrote:
...
> > > Anatolij, based on Hannes info, if you want to backtrack on this, I'm open both
> > ways.
> > I would suggest to have not too much ways for one goal. Maybe it would be
> > enough work a bit on documentation how to quiet console on LCD.
> 
> I agree with you 100% on not having multiple ways. What would be the
> procedure at this point?
> Submit a reverse patch?

I'll just revert this patch and prepare a pull request.

Thanks!

--
Anatolij