forked from mirrors/linux
f592cc5794
Each RPMh VRM accelerator resource has 3 or 4 contiguous 4-byte aligned
addresses associated with it. These control voltage, enable state, mode,
and in legacy targets, voltage headroom. The current in-flight request
checking logic looks for exact address matches. Requests for different
addresses of the same RPMh resource as thus not detected as in-flight.
Add new cmd-db API cmd_db_match_resource_addr() to enhance the in-flight
request check for VRM requests by ignoring the address offset.
This ensures that only one request is allowed to be in-flight for a given
VRM resource. This is needed to avoid scenarios where request commands are
carried out by RPMh hardware out-of-order leading to LDO regulator
over-current protection triggering.
Fixes: 658628e7ef ("drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs")
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Elliot Berman <quic_eberman@quicinc.com> # sm8650-qrd
Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com>
Link: https://lore.kernel.org/r/20240215-rpmh-rsc-fixes-v4-1-9cbddfcba05b@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
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* Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#ifndef __QCOM_COMMAND_DB_H__
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#define __QCOM_COMMAND_DB_H__
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#include <linux/err.h>
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enum cmd_db_hw_type {
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CMD_DB_HW_INVALID = 0,
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CMD_DB_HW_MIN = 3,
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CMD_DB_HW_ARC = CMD_DB_HW_MIN,
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CMD_DB_HW_VRM = 4,
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CMD_DB_HW_BCM = 5,
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CMD_DB_HW_MAX = CMD_DB_HW_BCM,
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CMD_DB_HW_ALL = 0xff,
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};
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#if IS_ENABLED(CONFIG_QCOM_COMMAND_DB)
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u32 cmd_db_read_addr(const char *resource_id);
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const void *cmd_db_read_aux_data(const char *resource_id, size_t *len);
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bool cmd_db_match_resource_addr(u32 addr1, u32 addr2);
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enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
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int cmd_db_ready(void);
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#else
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static inline u32 cmd_db_read_addr(const char *resource_id)
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{ return 0; }
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static inline const void *cmd_db_read_aux_data(const char *resource_id, size_t *len)
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{ return ERR_PTR(-ENODEV); }
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static inline bool cmd_db_match_resource_addr(u32 addr1, u32 addr2)
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{ return false; }
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static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id)
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{ return -ENODEV; }
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static inline int cmd_db_ready(void)
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{ return -ENODEV; }
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#endif /* CONFIG_QCOM_COMMAND_DB */
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#endif /* __QCOM_COMMAND_DB_H__ */
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