[Intel-gfx] [PATCH v6 3/4] ACPI / PMIC: Add generic intel_soc_pmic_exec_mipi_pmic_seq_element handling

[Ville Syrjälä]

On Mon, Jan 07, 2019 at 12:15:55PM +0100, Hans de Goede wrote:
> Most PMIC-s use only a single i2c-address, so after verifying the
> i2c-address matches, we can simply pass the call to regmap_update_bits.
> 
> This commit adds support for this and hooks this up for the xpower AXP288
> PMIC by setting the new pmic_i2c_address field.
> 
> This fixes the following errors on display on / off on a Jumper Ezpad
> mini 3 and an Onda V80 plus tablet, both of which use the AXP288:
> 
> intel_soc_pmic_exec_mipi_pmic_seq_element: Not implemented
> intel_soc_pmic_exec_mipi_pmic_seq_element: i2c-addr: 0x34 reg-addr ...
> [drm:mipi_exec_pmic [i915]] *ERROR* mipi_exec_pmic failed, error: -95
> 
> Instead of these errors on both devices we now correctly turn on / off
> DLDO3 (through direct register manipulation). On the Onda V80 plus this
> fixes an issue with the backlight being brighter around the borders after
> an off / on cycle. This should also help to save some power when the
> display is off.
> 
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> ---
> Changes in v6:
> -This is a new patch in v6 of this patch-set
> ---
>  drivers/acpi/pmic/intel_pmic.c        | 9 +++++++++
>  drivers/acpi/pmic/intel_pmic.h        | 2 ++
>  drivers/acpi/pmic/intel_pmic_xpower.c | 1 +
>  3 files changed, 12 insertions(+)
> 
> diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
> index 471afeea87c2..c14cfaea92e2 100644
> --- a/drivers/acpi/pmic/intel_pmic.c
> +++ b/drivers/acpi/pmic/intel_pmic.c
> @@ -359,6 +359,15 @@ int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address,
>  		ret = d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap,
>  						    i2c_address, reg_address,
>  						    value, mask);
> +	} else if (d->pmic_i2c_address) {
> +		if (i2c_address == d->pmic_i2c_address) {
> +			ret = regmap_update_bits(intel_pmic_opregion->regmap,
> +						 reg_address, mask, value);
> +		} else {
> +			pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
> +			       __func__, i2c_address, reg_address, value, mask);
> +			ret = -ENXIO;
> +		}
>  	} else {
>  		pr_warn("%s: Not implemented\n", __func__);
>  		pr_warn("%s: i2c-addr: 0x%x reg-addr 0x%x value 0x%x mask 0x%x\n",
> diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
> index 5cd195fabca8..89379476a1df 100644
> --- a/drivers/acpi/pmic/intel_pmic.h
> +++ b/drivers/acpi/pmic/intel_pmic.h
> @@ -21,6 +21,8 @@ struct intel_pmic_opregion_data {
>  	int power_table_count;
>  	struct pmic_table *thermal_table;
>  	int thermal_table_count;
> +	/* For generic exec_mipi_pmic_seq_element handling */
> +	int pmic_i2c_address;
>  };
>  
>  int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle, struct regmap *regmap, struct intel_pmic_opregion_data *d);
> diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
> index e7c0006e6602..a091d5a8392c 100644
> --- a/drivers/acpi/pmic/intel_pmic_xpower.c
> +++ b/drivers/acpi/pmic/intel_pmic_xpower.c
> @@ -265,6 +265,7 @@ static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
>  	.power_table_count = ARRAY_SIZE(power_table),
>  	.thermal_table = thermal_table,
>  	.thermal_table_count = ARRAY_SIZE(thermal_table),
> +	.pmic_i2c_address = 0x34,

Seems to match the axp288 datasheet.

FWIW
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

>  };
>  
>  static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel