drm/xe/i2c: Keep the i2c controller always enabled

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Some platforms make an assumption that the i2c controller's
enabled state indicates also the power state of the
controller. This can create a problem when the controller is
in disabled state, because the hardware may assume
incorrectly that it is then also in low-power state.

To fix this, the controller is kept enabled by taking over
the IC_ENABLE register. The controller has to be disabled
when the configuration is updated and when the target
address or the slave address are assigned, so disabling it
when IC_CON, IC_TAR or IC_SAR registers are programmed, and
then re-enabling it again.

Fixes: f0e53aadd7 ("drm/xe: Support for I2C attached MCUs")
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260811121008.1493015-4-heikki.krogerus@linux.intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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Heikki Krogerus 2026-08-11 14:10:08 +02:00 • committed by Rodrigo Vivi

parent a55b76b8bc

commit 76cc14e2fa

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2 changed files with 49 additions and 1 deletions

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drivers/gpu/drm/xe/xe_i2c.c

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1

drivers/gpu/drm/xe/xe_i2c.h

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