diff options
| author | Amit Nischal <anischal@codeaurora.org> | 2018-05-07 16:20:18 +0530 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2018-05-08 11:22:55 -0700 |
| commit | 7ef6f11887bd3676fc64517ca685f613d7f230ef (patch) | |
| tree | 9697c05f48220548b29aac32bdc322d8cf911f77 /drivers/clk/qcom/clk-rcg.h | |
| parent | 7d99ced8f4c65267836db69ec0790e878ef11b3b (diff) | |
clk: qcom: Configure the RCGs to a safe source as needed
For some root clock generators, there could be child branches which are
controlled by an entity other than application processor subsystem. For
such RCGs, as per application processor subsystem clock driver, all of
its downstream clocks are disabled and RCG is in disabled state but in
reality downstream clocks can be left enabled before.
So in this scenario, when RCG is disabled as per clock driver's point of
view and when rate scaling request comes before downstream clock enable
request, then RCG fails to update its configuration because in reality
RCG is on and it expects its new source to already be in enable state but
in reality new source is off. In order to avoid having the RCG to go into
an invalid state, add support to update the CFG, M, N and D registers
during set_rate() without configuration update and defer the actual RCG
configuration update to be done during clk_enable() as at this point of
time, both its new parent and safe source will be already enabled and RCG
can safely switch to new parent.
During clk_disable() request, configure it to safe source as both its
parents, safe source and current parent will be enabled and RCG can
safely execute a switch.
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Amit Nischal <anischal@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/qcom/clk-rcg.h')
| -rw-r--r-- | drivers/clk/qcom/clk-rcg.h | 17 |
1 files changed, 5 insertions, 12 deletions
diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h index 2a7489a84e69..b209a2fe86b9 100644 --- a/drivers/clk/qcom/clk-rcg.h +++ b/drivers/clk/qcom/clk-rcg.h @@ -1,15 +1,5 @@ -/* - * Copyright (c) 2013, The Linux Foundation. All rights reserved. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2013, 2018, The Linux Foundation. All rights reserved. */ #ifndef __QCOM_CLK_RCG_H__ #define __QCOM_CLK_RCG_H__ @@ -144,6 +134,7 @@ extern const struct clk_ops clk_dyn_rcg_ops; * @cmd_rcgr: corresponds to *_CMD_RCGR * @mnd_width: number of bits in m/n/d values * @hid_width: number of bits in half integer divider + * @safe_src_index: safe src index value * @parent_map: map from software's parent index to hardware's src_sel field * @freq_tbl: frequency table * @clkr: regmap clock handle @@ -153,6 +144,7 @@ struct clk_rcg2 { u32 cmd_rcgr; u8 mnd_width; u8 hid_width; + u8 safe_src_index; const struct parent_map *parent_map; const struct freq_tbl *freq_tbl; struct clk_regmap clkr; @@ -167,5 +159,6 @@ extern const struct clk_ops clk_byte_ops; extern const struct clk_ops clk_byte2_ops; extern const struct clk_ops clk_pixel_ops; extern const struct clk_ops clk_gfx3d_ops; +extern const struct clk_ops clk_rcg2_shared_ops; #endif |