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b7dbc686f6
Provide clk-scaling feature in MediaTek UFS platforms. MediaTek platform supports clk-scaling by switching parent clock mux of UFSHCI main clocks: ufs_sel. The driver needs to prevent changing the rate of ufs_sel because its parent PLL clock may be shared between multiple IPs. In order to achieve this goal, the maximum and minimum clock rates of ufs_sel defined in dts should match the rate of "ufs_sel_max_src" and "ufs_sel_min_src" respectively. Link: https://lore.kernel.org/r/20220802235437.4547-6-stanley.chu@mediatek.com Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 MediaTek Inc.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM ufs_mtk
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#if !defined(_TRACE_EVENT_UFS_MEDIATEK_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_EVENT_UFS_MEDIATEK_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(ufs_mtk_event,
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TP_PROTO(unsigned int type, unsigned int data),
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TP_ARGS(type, data),
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TP_STRUCT__entry(
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__field(unsigned int, type)
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__field(unsigned int, data)
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),
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TP_fast_assign(
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__entry->type = type;
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__entry->data = data;
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),
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TP_printk("ufs: event=%u data=%u",
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__entry->type, __entry->data)
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);
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TRACE_EVENT(ufs_mtk_clk_scale,
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TP_PROTO(const char *name, bool scale_up, unsigned long clk_rate),
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TP_ARGS(name, scale_up, clk_rate),
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TP_STRUCT__entry(
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__field(const char*, name)
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__field(bool, scale_up)
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__field(unsigned long, clk_rate)
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),
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TP_fast_assign(
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__entry->name = name;
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__entry->scale_up = scale_up;
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__entry->clk_rate = clk_rate;
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),
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TP_printk("ufs: clk (%s) scaled %s @ %lu",
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__entry->name,
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__entry->scale_up ? "up" : "down",
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__entry->clk_rate)
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);
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#endif
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#undef TRACE_INCLUDE_PATH
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_PATH ../../drivers/ufs/host
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#define TRACE_INCLUDE_FILE ufs-mediatek-trace
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#include <trace/define_trace.h>
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