[Intel-gfx] [PATCH 07/23] drm/i915/mtl: Add gmbus and gpio support

[Matt Roper]

On Wed, Jul 27, 2022 at 06:34:04PM -0700, Radhakrishna Sripada wrote:
> Add tables to map the GMBUS pin pairs to GPIO registers and port to DDC.
> From spec we have registers GPIO_CTL[1-5] mapped to combo phys and

This description is misleading since MTL doesn't have "combo phys."

I think the key point to note here is that compared to ICP/TGP/ADP, we
now have two additional GPIO pins (4 and 5).


Matt

> GPIO_CTL[9-14] are mapped to TC ports.
> 
> BSpec: 49306
> 
> Original Author: Brian J Lovin
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_gmbus.c | 17 +++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_gmbus.h |  1 +
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_gmbus.c b/drivers/gpu/drm/i915/display/intel_gmbus.c
> index a6ba7fb72339..542b8b2654be 100644
> --- a/drivers/gpu/drm/i915/display/intel_gmbus.c
> +++ b/drivers/gpu/drm/i915/display/intel_gmbus.c
> @@ -116,6 +116,20 @@ static const struct gmbus_pin gmbus_pins_dg2[] = {
>  	[GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOJ },
>  };
>  
> +static const struct gmbus_pin gmbus_pins_mtp[] = {
> +	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
> +	[GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
> +	[GMBUS_PIN_3_BXT] = { "dpc", GPIOD },
> +	[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
> +	[GMBUS_PIN_5_MTP] = { "dpe", GPIOF },
> +	[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 },
> +	[GMBUS_PIN_13_TC5_TGP] = { "tc5", GPION },
> +	[GMBUS_PIN_14_TC6_TGP] = { "tc6", GPIOO },
> +};
> +
>  static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *i915,
>  					     unsigned int pin)
>  {
> @@ -128,6 +142,9 @@ static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *i915,
>  	} else if (INTEL_PCH_TYPE(i915) >= PCH_DG1) {
>  		pins = gmbus_pins_dg1;
>  		size = ARRAY_SIZE(gmbus_pins_dg1);
> +	} else if (INTEL_PCH_TYPE(i915) >= PCH_MTP) {
> +		pins = gmbus_pins_mtp;
> +		size = ARRAY_SIZE(gmbus_pins_mtp);
>  	} else if (INTEL_PCH_TYPE(i915) >= PCH_ICP) {
>  		pins = gmbus_pins_icp;
>  		size = ARRAY_SIZE(gmbus_pins_icp);
> diff --git a/drivers/gpu/drm/i915/display/intel_gmbus.h b/drivers/gpu/drm/i915/display/intel_gmbus.h
> index 8edc2e99cf53..20f704bd4e70 100644
> --- a/drivers/gpu/drm/i915/display/intel_gmbus.h
> +++ b/drivers/gpu/drm/i915/display/intel_gmbus.h
> @@ -24,6 +24,7 @@ struct i2c_adapter;
>  #define GMBUS_PIN_2_BXT		2
>  #define GMBUS_PIN_3_BXT		3
>  #define GMBUS_PIN_4_CNP		4
> +#define GMBUS_PIN_5_MTP		5
>  #define GMBUS_PIN_9_TC1_ICP	9
>  #define GMBUS_PIN_10_TC2_ICP	10
>  #define GMBUS_PIN_11_TC3_ICP	11
> -- 
> 2.25.1
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation