Commit ee7e5afd authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman
Browse files

mei: condition PGI support on HW and HBM version 



Enable power gating isolation only if hw and fw support it.
This is indicated by ME_PGIC_HRA bit in ME_CSR_HA register
and on HBM protocol version.

The information is exported to MEI layer through
new pg_is_enabled hw op.

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b16c3571

drivers/misc/mei/hw-me.c

+37 −0
Original line number Diff line number Diff line
@@ -459,6 +459,41 @@ static void mei_me_pg_exit(struct mei_device *dev) 
	mei_me_reg_write(hw, H_HPG_CSR, reg);

}



/**

 * mei_me_pg_is_enabled - detect if PG is supported by HW

 *

 * @dev: the device structure

 *

 * returns: true is pg supported, false otherwise

 */

static bool mei_me_pg_is_enabled(struct mei_device *dev)

{

	struct mei_me_hw *hw = to_me_hw(dev);

	u32 reg = mei_me_reg_read(hw, ME_CSR_HA);



	if ((reg & ME_PGIC_HRA) == 0)

		goto notsupported;



	if (dev->version.major_version < HBM_MAJOR_VERSION_PGI)

		goto notsupported;



	if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&

	    dev->version.minor_version < HBM_MINOR_VERSION_PGI)

		goto notsupported;



	return true;



notsupported:

	dev_dbg(&dev->pdev->dev, "pg: not supported: HGP = %d hbm version %d.%d ?= %d.%d\n",

		!!(reg & ME_PGIC_HRA),

		dev->version.major_version,

		dev->version.minor_version,

		HBM_MAJOR_VERSION_PGI,

		HBM_MINOR_VERSION_PGI);



	return false;

}



/**

 * mei_me_irq_quick_handler - The ISR of the MEI device

 *
@@ -573,6 +608,8 @@ static const struct mei_hw_ops mei_me_hw_ops = { 
	.hw_config = mei_me_hw_config,

	.hw_start = mei_me_hw_start,



	.pg_is_enabled = mei_me_pg_is_enabled,



	.intr_clear = mei_me_intr_clear,

	.intr_enable = mei_me_intr_enable,

	.intr_disable = mei_me_intr_disable,

drivers/misc/mei/hw-txe.c

+14 −0
Original line number Diff line number Diff line
@@ -279,6 +279,18 @@ int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req) 
	return 0;

}



/**

 * mei_txe_pg_is_enabled - detect if PG is supported by HW

 *

 * @dev: the device structure

 *

 * returns: true is pg supported, false otherwise

 */

static bool mei_txe_pg_is_enabled(struct mei_device *dev)

{

	return true;

}



/**

 * mei_txe_input_ready_interrupt_enable - sets the Input Ready Interrupt

 *
@@ -1017,6 +1029,8 @@ static const struct mei_hw_ops mei_txe_hw_ops = { 
	.hw_config = mei_txe_hw_config,

	.hw_start = mei_txe_hw_start,



	.pg_is_enabled = mei_txe_pg_is_enabled,



	.intr_clear = mei_txe_intr_clear,

	.intr_enable = mei_txe_intr_enable,

	.intr_disable = mei_txe_intr_disable,

drivers/misc/mei/hw.h

+6 −0
Original line number Diff line number Diff line
@@ -39,6 +39,12 @@ 
#define HBM_MINOR_VERSION                   0

#define HBM_MAJOR_VERSION                   1



/*

 * MEI version with PGI support

 */

#define HBM_MINOR_VERSION_PGI               1

#define HBM_MAJOR_VERSION_PGI               1



/* Host bus message command opcode */

#define MEI_HBM_CMD_OP_MSK                  0x7f

/* Host bus message command RESPONSE */

drivers/misc/mei/mei_dev.h

+10 −0
Original line number Diff line number Diff line
@@ -220,6 +220,8 @@ struct mei_cl { 
 * @hw_start         - start hw after reset

 * @hw_config        - configure hw



 * @pg_is_enabled    - is power gating enabled



 * @intr_clear       - clear pending interrupts

 * @intr_enable      - enable interrupts

 * @intr_disable     - disable interrupts
@@ -244,6 +246,8 @@ struct mei_hw_ops { 
	int (*hw_start)(struct mei_device *dev);

	void (*hw_config)(struct mei_device *dev);



	bool (*pg_is_enabled)(struct mei_device *dev);



	void (*intr_clear)(struct mei_device *dev);

	void (*intr_enable)(struct mei_device *dev);

	void (*intr_disable)(struct mei_device *dev);
@@ -558,6 +562,12 @@ static inline void mei_hw_config(struct mei_device *dev) 
{

	dev->ops->hw_config(dev);

}



static inline bool mei_pg_is_enabled(struct mei_device *dev)

{

	return dev->ops->pg_is_enabled(dev);

}



static inline int mei_hw_reset(struct mei_device *dev, bool enable)

{

	return dev->ops->hw_reset(dev, enable);

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