Re: [PATCH 25/24] drm/i915/icl: fix gmbus gpio pin mapping

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On Fri, May 25, 2018 at 07:24:07PM +0300, Ville Syrjälä wrote:
> On Thu, May 24, 2018 at 05:36:37PM -0700, Lucas De Marchi wrote:
> > On Thu, May 24, 2018 at 04:42:36PM -0700, Paulo Zanoni wrote:
> > > From: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> > > 
> > > ICP has GPIO pin 1/2 mapped to combo-phy ports & GPIO pins 9/10/11/12
> > > mapped to tc ports[1-4].
> > > This patch defines GPIOCTL registers for GPIO pins 9-12 & uses them in GPIO
> > > pin mapping table.
> > > 
> > > Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> > > Cc: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
> > > Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> > > Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> > > ---
> > >  drivers/gpu/drm/i915/i915_reg.h   |  4 ++++
> > >  drivers/gpu/drm/i915/intel_hdmi.c |  2 +-
> > >  drivers/gpu/drm/i915/intel_i2c.c  | 12 ++++++------
> > >  3 files changed, 11 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index 452356a4af07..e48b717769b2 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -3015,6 +3015,10 @@ enum i915_power_well_id {
> > >  #define GPIOF			_MMIO(0x5024)
> > >  #define GPIOG			_MMIO(0x5028)
> > >  #define GPIOH			_MMIO(0x502c)
> > > +#define GPIOJ			_MMIO(0x5034)
> > > +#define GPIOK			_MMIO(0x5038)
> > > +#define GPIOL			_MMIO(0x503C)
> > > +#define GPIOM			_MMIO(0x5040)
> > 
> > I was reviewing again this and I think again I was puzzled why the spec
> > has them as 0xc5034, ...
> > 
> > Probably same conclusion as I had when I first reviewed this. Maybe it
> > would be nice to add a comment to PCH_GPIO* saying PCH_GPIOA is used
> > only for calculation the gpio base and remove the rest. I can send this
> > is a separate patch, what do you think?
> > 
> > -------8<-------
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 6953419881c4..40b9aa57078b 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7442,12 +7442,8 @@ enum {
> >  #define  PORTE_HOTPLUG_SHORT_DETECT	(1 << 0)
> >  #define  PORTE_HOTPLUG_LONG_DETECT	(2 << 0)
> >  
> > +/* Used just for calculating the gpio base for PCH */
> >  #define PCH_GPIOA               _MMIO(0xc5010)
> > -#define PCH_GPIOB               _MMIO(0xc5014)
> > -#define PCH_GPIOC               _MMIO(0xc5018)
> > -#define PCH_GPIOD               _MMIO(0xc501c)
> > -#define PCH_GPIOE               _MMIO(0xc5020)
> > -#define PCH_GPIOF               _MMIO(0xc5024)
> 
> Maybe just have
> 
> #define PCH_GPIO_BASE ...
> 
> and throw out the PCH_GPIO/GMBUS defines entirely?

Yeah just thought about this after sending the email. I will spin a
patch with that.

thanks
Lucas De Marchi

> 
> >  
> >  #define PCH_GMBUS0		_MMIO(0xc5100)
> >  #define PCH_GMBUS1		_MMIO(0xc5104)
> > -------8<-------
> > 
> > 
> > Other than that,
> > 
> > Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> > 
> > >  # define GPIO_CLOCK_DIR_MASK		(1 << 0)
> > >  # define GPIO_CLOCK_DIR_IN		(0 << 1)
> > >  # define GPIO_CLOCK_DIR_OUT		(1 << 1)
> > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > > index 75f02a0e7d39..3db2459c79b1 100644
> > > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > > @@ -2276,7 +2276,7 @@ static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
> > >  		ddc_pin = bxt_port_to_ddc_pin(dev_priv, port);
> > >  	else if (HAS_PCH_CNP(dev_priv))
> > >  		ddc_pin = cnp_port_to_ddc_pin(dev_priv, port);
> > > -	else if (IS_ICELAKE(dev_priv))
> > > +	else if (HAS_PCH_ICP(dev_priv))
> > >  		ddc_pin = icl_port_to_ddc_pin(dev_priv, port);
> > >  	else
> > >  		ddc_pin = g4x_port_to_ddc_pin(dev_priv, port);
> > > diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
> > > index e6875509bcd9..b91e418028cb 100644
> > > --- a/drivers/gpu/drm/i915/intel_i2c.c
> > > +++ b/drivers/gpu/drm/i915/intel_i2c.c
> > > @@ -77,12 +77,12 @@ static const struct gmbus_pin gmbus_pins_cnp[] = {
> > >  };
> > >  
> > >  static const struct gmbus_pin gmbus_pins_icp[] = {
> > > -	[GMBUS_PIN_1_BXT] = { "dpa", GPIOA },
> > > -	[GMBUS_PIN_2_BXT] = { "dpb", GPIOB },
> > > -	[GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOC },
> > > -	[GMBUS_PIN_10_TC2_ICP] = { "tc2", GPIOD },
> > > -	[GMBUS_PIN_11_TC3_ICP] = { "tc3", GPIOE },
> > > -	[GMBUS_PIN_12_TC4_ICP] = { "tc4", GPIOF },
> > > +	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
> > > +	[GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
> > > +	[GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOJ },
> > > +	[GMBUS_PIN_10_TC2_ICP] = { "tc2", GPIOK },
> > > +	[GMBUS_PIN_11_TC3_ICP] = { "tc3", GPIOL },
> > > +	[GMBUS_PIN_12_TC4_ICP] = { "tc4", GPIOM },
> > >  };
> > >  
> > >  /* pin is expected to be valid */
> > > -- 
> > > 2.14.3
> > > 
> > > _______________________________________________
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> 
> -- 
> Ville Syrjälä
> Intel
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