Re: [RFC PATCH 3/3] imx: imx8mp_evk: override env_get_location

["Marek Behún" <marek.behun@nic.cz>]

On Sun, 28 Nov 2021 18:47:11 +0100
Tommaso Merciai <tomm.merciai@gmail.com> wrote:

> On Fri, Nov 26, 2021 at 07:00:21PM +0100, Marek Behún wrote:
> > On Fri, 26 Nov 2021 18:43:31 +0100
> > Tommaso Merciai <tomm.merciai@gmail.com> wrote:
> >   
> > > Override env_get_location function at board level, previously dropped
> > > down from soc.c
> > > 
> > > References:
> > >  - commit f1575f23df1ef704051f218d5bc4aeeb20c2c542
> > > 
> > > Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
> > > ---
> > > Changes since v1:
> > >  - Remove wrong env_get_offset function from commit
> > > 
> > >  board/freescale/imx8mp_evk/imx8mp_evk.c | 41 +++++++++++++++++++++++++
> > >  1 file changed, 41 insertions(+)
> > > 
> > > diff --git a/board/freescale/imx8mp_evk/imx8mp_evk.c b/board/freescale/imx8mp_evk/imx8mp_evk.c
> > > index 62096c24fb..6b2eeaf152 100644
> > > --- a/board/freescale/imx8mp_evk/imx8mp_evk.c
> > > +++ b/board/freescale/imx8mp_evk/imx8mp_evk.c
> > > @@ -5,6 +5,7 @@
> > >  
> > >  #include <common.h>
> > >  #include <env.h>
> > > +#include <env_internal.h>
> > >  #include <errno.h>
> > >  #include <init.h>
> > >  #include <miiphy.h>
> > > @@ -17,6 +18,7 @@
> > >  #include <asm/arch/clock.h>
> > >  #include <asm/arch/sys_proto.h>
> > >  #include <asm/mach-imx/gpio.h>
> > > +#include <asm/mach-imx/boot_mode.h>
> > >  
> > >  DECLARE_GLOBAL_DATA_PTR;
> > >  
> > > @@ -32,6 +34,45 @@ static iomux_v3_cfg_t const wdog_pads[] = {
> > >  	MX8MP_PAD_GPIO1_IO02__WDOG1_WDOG_B  | MUX_PAD_CTRL(WDOG_PAD_CTRL),
> > >  };
> > >  
> > > +enum env_location env_get_location(enum env_operation op, int prio)
> > > +{
> > > +	enum boot_device dev = get_boot_device();
> > > +	enum env_location env_loc = ENVL_UNKNOWN;
> > > +
> > > +	if (prio)
> > > +		return env_loc;
> > > +
> > > +	switch (dev) {
> > > +#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
> > > +	case QSPI_BOOT:
> > > +		env_loc = ENVL_SPI_FLASH;
> > > +		break;
> > > +#endif
> > > +#ifdef CONFIG_ENV_IS_IN_NAND
> > > +	case NAND_BOOT:
> > > +		env_loc = ENVL_NAND;
> > > +		break;
> > > +#endif
> > > +#ifdef CONFIG_ENV_IS_IN_MMC
> > > +	case SD1_BOOT:
> > > +	case SD2_BOOT:
> > > +	case SD3_BOOT:
> > > +	case MMC1_BOOT:
> > > +	case MMC2_BOOT:
> > > +	case MMC3_BOOT:
> > > +		env_loc =  ENVL_MMC;
> > > +		break;
> > > +#endif
> > > +	default:
> > > +#if defined(CONFIG_ENV_IS_NOWHERE)
> > > +		env_loc = ENVL_NOWHERE;
> > > +#endif  
> > 
> > Using
> >   if (IS_ENABLED(CONFIG_ENV_IS_NOWHERE))
> > instead of #ifdefs is preferred because the compiler then warns about
> > bugs even in the disabled codepaths (that's why checkpatch complains
> > about #ifdefs).
> > 
> > I know that this cannot be combined with switch() in a simple way,
> > though.
> > 
> > Do you need to use switch? Can't you rewrite it to use if()s and use
> > IS_ENABLED()?
> > 
> > Marek  
> 
> Hi Marek,
> Thanks for your review. What do you think about this solution?
> 
> enum env_location env_get_location(enum env_operation op, int prio)
> {
> 	enum boot_device dev = get_boot_device();
> 	enum env_location env_loc = ENVL_UNKNOWN;
> 
> 	if (prio)
> 		return env_loc;
> 
> 	if (IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH) && dev == QSPI_BOOT) {
> 		env_loc = ENVL_SPI_FLASH;
> 	}
> 	else if (IS_ENABLED(CONFIG_ENV_IS_IN_NAND) && dev == NAND_BOOT) {
> 		env_loc = ENVL_NAND;
> 	}
> 	else if (IS_ENABLED(CONFIG_ENV_IS_IN_MMC)) {
> 		switch (dev) {
> 			case SD1_BOOT:
> 			case SD2_BOOT:
> 			case SD3_BOOT:
> 			case MMC1_BOOT:
> 			case MMC2_BOOT:
> 			case MMC3_BOOT:
> 				env_loc = ENVL_MMC;
> 				break;
> 		default:
> 			break;
> 		}
> 	}
> 	else if (IS_ENABLED(CONFIG_ENV_IS_NOWHERE)) {
> 		env_loc = ENVL_MMC;
> 	}
> 
> 	return env_loc;
> }

Thanks, this looks ok, just run it through checkpatch to correct the
indentation of 'case' statements and put 'else if' on the same line as
'}':

  if () {
  } else if () {
  } ...

Marek