Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/i915/cx0: Clear response ready & error bit
Clear the response ready and error bit of PORT_P2M_MESSAGE_BUS_STATUS
before writing the transaction pending bit of
PORT_M2P_MSGBUS_CTL as that is a hard requirement. If not done
we find that the PHY hangs since it ends up in a weird state if left
idle for more than 1 hour.
Bspec: 65101
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/20260122044859.753682-1-suraj.kandpal@intel.com
+4
+4
drivers/gpu/drm/i915/display/intel_cx0_phy.c
+4
drivers/gpu/drm/i915/display/intel_cx0_phy.c
···
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return -ETIMEDOUT;
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}
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+
intel_clear_response_ready_flag(encoder, lane);
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+
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intel_de_write(display, XELPDP_PORT_M2P_MSGBUS_CTL(display, port, lane),
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XELPDP_PORT_M2P_TRANSACTION_PENDING |
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XELPDP_PORT_M2P_COMMAND_READ |
···
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intel_cx0_bus_reset(encoder, lane);
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return -ETIMEDOUT;
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}
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+
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+
intel_clear_response_ready_flag(encoder, lane);
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intel_de_write(display, XELPDP_PORT_M2P_MSGBUS_CTL(display, port, lane),
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XELPDP_PORT_M2P_TRANSACTION_PENDING |