On Thu, Dec 06, 2018 at 02:47:03PM +0100, Hans de Goede wrote:
> DSI LCD panels describe an initialization sequence in the Video BIOS
> Tables using so called MIPI sequences. One possible element in these
> sequences is a PMIC specific element of 15 bytes.
>
> Although this is not really an ACPI opregion, the ACPI opregion code is the
> closest thing we have. We need to have support for these PMIC specific MIPI
> sequence elements somwhere. Since we already instantiate a special platform
> device for Intel PMICs for the ACPI PMIC OpRegion handler to bind to,
> with PMIC specific implementations of the OpRegion, the handling of MIPI
> sequence PMIC elements fits very well in the ACPI PMIC OpRegion code.
>
> This commit adds a new intel_soc_pmic_exec_mipi_pmic_seq_element()
> function, which is to be backed by a PMIC specific
> exec_mipi_pmic_seq_element callback. This function will be called by the
> i915 code to execture MIPI sequence PMIC elements.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/acpi/pmic/intel_pmic.c | 25 +++++++++++++++++++++++++
> drivers/acpi/pmic/intel_pmic.h | 1 +
> include/linux/mfd/intel_soc_pmic.h | 2 ++
> 3 files changed, 28 insertions(+)
>
> diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
> index ca18e0d23df9..0d96ca08bb79 100644
> --- a/drivers/acpi/pmic/intel_pmic.c
> +++ b/drivers/acpi/pmic/intel_pmic.c
> @@ -15,6 +15,7 @@
>
> #include <linux/export.h>
> #include <linux/acpi.h>
> +#include <linux/mfd/intel_soc_pmic.h>
> #include <linux/regmap.h>
> #include <acpi/acpi_lpat.h>
> #include "intel_pmic.h"
> @@ -36,6 +37,8 @@ struct intel_pmic_opregion {
> struct intel_pmic_regs_handler_ctx ctx;
> };
>
> +static struct intel_pmic_opregion *intel_pmic_opregion;
> +
> static int pmic_get_reg_bit(int address, struct pmic_table *table,
> int count, int *reg, int *bit)
> {
> @@ -304,6 +307,7 @@ int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
> }
>
> opregion->data = d;
> + intel_pmic_opregion = opregion;
> return 0;
>
> out_remove_thermal_handler:
> @@ -319,3 +323,24 @@ int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
> return ret;
> }
> EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
> +
Since this is exported, please add kernel-doc here.
> +void intel_soc_pmic_exec_mipi_pmic_seq_element(const u8 *data)
> +{
> + struct intel_pmic_opregion_data *d;
> +
> + if (!intel_pmic_opregion) {
> + pr_warn("%s: No PMIC registered\n", __func__);
> + return;
Why not return error codes instead?
Other ops in struct intel_pmic_opregion_data seem to do so.
> + }
> +
> + d = intel_pmic_opregion->data;
> + if (!d->exec_mipi_pmic_seq_element) {
> + pr_warn("%s: Not implemented\n", __func__);
> + return;
Ditto.
> + }
> +
> + mutex_lock(&intel_pmic_opregion->lock);
> + d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap, data);
> + mutex_unlock(&intel_pmic_opregion->lock);
> +}
> +EXPORT_SYMBOL_GPL(intel_soc_pmic_exec_mipi_pmic_seq_element);
> diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
> index 095afc96952e..5a7bb33d046a 100644
> --- a/drivers/acpi/pmic/intel_pmic.h
> +++ b/drivers/acpi/pmic/intel_pmic.h
> @@ -15,6 +15,7 @@ struct intel_pmic_opregion_data {
> int (*update_aux)(struct regmap *r, int reg, int raw_temp);
> int (*get_policy)(struct regmap *r, int reg, int bit, u64 *value);
> int (*update_policy)(struct regmap *r, int reg, int bit, int enable);
> + void (*exec_mipi_pmic_seq_element)(struct regmap *r, const u8 *data);
> struct pmic_table *power_table;
> int power_table_count;
> struct pmic_table *thermal_table;
> diff --git a/include/linux/mfd/intel_soc_pmic.h b/include/linux/mfd/intel_soc_pmic.h
> index ed1dfba5e5f9..ce04ad7d4b6c 100644
> --- a/include/linux/mfd/intel_soc_pmic.h
> +++ b/include/linux/mfd/intel_soc_pmic.h
> @@ -26,4 +26,6 @@ struct intel_soc_pmic {
> struct device *dev;
> };
>
> +void intel_soc_pmic_exec_mipi_pmic_seq_element(const u8 *data);
> +
> #endif /* __INTEL_SOC_PMIC_H__ */
> --
> 2.19.2
