Commit 46dcbc61 authored by Mark Pearson's avatar Mark Pearson Committed by Hans de Goede
Browse files

platform/x86: thinkpad-acpi: Add support for automatic mode transitions 



Some AMD Thinkpads support automatic mode transitions.  The actual
transition logic doesn't live in the `thinkpad_acpi` driver. The events
to activate this logic come from this driver though.

Populate these events when switching PSC power modes.

Co-developed-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Signed-off-by: default avatarMark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20220603170212.164963-2-markpearson@lenovo.com


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 6fe391dd

drivers/platform/x86/thinkpad_acpi.c

+34 −0
Original line number Diff line number Diff line
@@ -10266,6 +10266,7 @@ static struct ibm_struct proxsensor_driver_data = { 
#define DYTC_CMD_FUNC_CAP     3 /* To get DYTC capabilities */

#define DYTC_FC_MMC           27 /* MMC Mode supported */

#define DYTC_FC_PSC           29 /* PSC Mode supported */

#define DYTC_FC_AMT           31 /* AMT mode supported */



#define DYTC_GET_FUNCTION_BIT 8  /* Bits  8-11 - function setting */

#define DYTC_GET_MODE_BIT     12 /* Bits 12-15 - mode setting */
@@ -10278,6 +10279,10 @@ static struct ibm_struct proxsensor_driver_data = { 
#define DYTC_FUNCTION_CQL     1  /* Function = 1, lap mode */

#define DYTC_FUNCTION_MMC     11 /* Function = 11, MMC mode */

#define DYTC_FUNCTION_PSC     13 /* Function = 13, PSC mode */

#define DYTC_FUNCTION_AMT     15 /* Function = 15, AMT mode */



#define DYTC_MODE_AMT_ENABLE   0x1 /* Enable AMT (in balanced mode) */

#define DYTC_MODE_AMT_DISABLE  0xF /* Disable AMT (in other modes) */



#define DYTC_MODE_MMC_PERFORM  2  /* High power mode aka performance */

#define DYTC_MODE_MMC_LOWPOWER 3  /* Low power mode */
@@ -10298,6 +10303,8 @@ static struct ibm_struct proxsensor_driver_data = { 


#define DYTC_DISABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_MMC_BALANCE, 0)

#define DYTC_ENABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_MMC_BALANCE, 1)

static int dytc_control_amt(bool enable);

static bool dytc_amt_active;



static enum platform_profile_option dytc_current_profile;

static atomic_t dytc_ignore_event = ATOMIC_INIT(0);
@@ -10380,6 +10387,30 @@ static int dytc_profile_get(struct platform_profile_handler *pprof, 
	return 0;

}



static int dytc_control_amt(bool enable)

{

	int dummy;

	int err;

	int cmd;



	if (!(dytc_capabilities & BIT(DYTC_FC_AMT))) {

		pr_warn("Attempting to toggle AMT on a system that doesn't advertise support\n");

		return -ENODEV;

	}



	if (enable)

		cmd = DYTC_SET_COMMAND(DYTC_FUNCTION_AMT, DYTC_MODE_AMT_ENABLE, enable);

	else

		cmd = DYTC_SET_COMMAND(DYTC_FUNCTION_AMT, DYTC_MODE_AMT_DISABLE, enable);



	pr_debug("%sabling AMT (cmd 0x%x)", enable ? "en":"dis", cmd);

	err = dytc_command(cmd, &dummy);

	if (err)

		return err;

	dytc_amt_active = enable;

	return 0;

}



/*

 * Helper function - check if we are in CQL mode and if we are

 *  -  disable CQL,
@@ -10462,6 +10493,9 @@ static int dytc_profile_set(struct platform_profile_handler *pprof, 
		err = dytc_command(DYTC_SET_COMMAND(DYTC_FUNCTION_PSC, perfmode, 1), &output);

		if (err)

			goto unlock;

		/* system supports AMT, activate it when on balanced */

		if (dytc_capabilities & BIT(DYTC_FC_AMT))

			dytc_control_amt(profile == PLATFORM_PROFILE_BALANCED);

	}

	/* Success - update current profile */

	dytc_current_profile = profile;