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drm/xe/i2c: Introduce xe_i2c_present()

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In preparation of wider usecases which require checking for I2C
controller presence, introduce xe_i2c_present() helper.

v2: Doc fix (Riana)

Suggested-by: Riana Tauro <riana.tauro@intel.com>
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Riana Tauro <riana.tauro@intel.com>
Link: https://lore.kernel.org/r/20250814091845.1356135-1-raag.jadav@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Raag Jadav 2025-08-14 14:48:45 +05:30 committed by Rodrigo Vivi
parent 32a4d1b98e
commit cc8b221172
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GPG Key ID: FA625F640EEB13CA
2 changed files with 18 additions and 2 deletions
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18
drivers/gpu/drm/xe/xe_i2c.c
View File

@ -146,6 +146,20 @@ static void xe_i2c_unregister_adapter(struct xe_i2c *i2c)
fwnode_remove_software_node(i2c->adapter_node);
}
/**
* xe_i2c_present - I2C controller is present and functional
* @xe: xe device instance
*
* Check whether the I2C controller is present and functioning with valid
* endpoint cookie.
*
* Return: %true if present, %false otherwise.
*/
bool xe_i2c_present(struct xe_device *xe)
{
return xe->i2c && xe->i2c->ep.cookie == XE_I2C_EP_COOKIE_DEVICE;
}
/**
* xe_i2c_irq_handler: Handler for I2C interrupts
* @xe: xe device instance
@ -230,7 +244,7 @@ void xe_i2c_pm_suspend(struct xe_device *xe)
{
struct xe_mmio *mmio = xe_root_tile_mmio(xe);
if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)
if (!xe_i2c_present(xe))
return;
xe_mmio_rmw32(mmio, I2C_CONFIG_PMCSR, PCI_PM_CTRL_STATE_MASK, (__force u32)PCI_D3hot);
@ -241,7 +255,7 @@ void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold)
{
struct xe_mmio *mmio = xe_root_tile_mmio(xe);
if (!xe->i2c || xe->i2c->ep.cookie != XE_I2C_EP_COOKIE_DEVICE)
if (!xe_i2c_present(xe))
return;
if (d3cold)

2
drivers/gpu/drm/xe/xe_i2c.h
View File

@ -49,11 +49,13 @@ struct xe_i2c {
#if IS_ENABLED(CONFIG_I2C)
int xe_i2c_probe(struct xe_device *xe);
bool xe_i2c_present(struct xe_device *xe);
void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl);
void xe_i2c_pm_suspend(struct xe_device *xe);
void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold);
#else
static inline int xe_i2c_probe(struct xe_device *xe) { return 0; }
static inline bool xe_i2c_present(struct xe_device *xe) { return false; }
static inline void xe_i2c_irq_handler(struct xe_device *xe, u32 master_ctl) { }
static inline void xe_i2c_pm_suspend(struct xe_device *xe) { }
static inline void xe_i2c_pm_resume(struct xe_device *xe, bool d3cold) { }