From mboxrd@z Thu Jan 1 00:00:00 1970 From: Weiyi Lu Subject: [RFC v1] clk: core: support clocks that need to be enabled during re-parent Date: Mon, 10 Jun 2019 11:44:53 +0800 Message-ID: <1560138293-4163-1-git-send-email-weiyi.lu@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Matthias Brugger , Stephen Boyd Cc: James Liao , Fan Chen , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-clk@vger.kernel.org, srv_heupstream@mediatek.com, stable@vger.kernel.org, Weiyi Lu , Biao Huang List-Id: linux-mediatek@lists.infradead.org When using property assigned-clock-parents to assign parent clocks, core clocks might still be disabled during re-parent. Add flag 'CLK_OPS_CORE_ENABLE' for those clocks must be enabled during re-parent. Signed-off-by: Weiyi Lu --- drivers/clk/clk.c | 9 +++++++++ include/linux/clk-provider.h | 1 + 2 files changed, 10 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 443711f..b2e6fe3 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1717,6 +1717,10 @@ static struct clk_core *__clk_set_parent_before(struct clk_core *core, clk_core_prepare_enable(parent); } + /* enable core if CLK_OPS_CORE_ENABLE is set */ + if (core->flags & CLK_OPS_CORE_ENABLE) + clk_core_prepare_enable(core); + /* migrate prepare count if > 0 */ if (core->prepare_count) { clk_core_prepare_enable(parent); @@ -1744,6 +1748,10 @@ static void __clk_set_parent_after(struct clk_core *core, clk_core_disable_unprepare(old_parent); } + /* re-balance ref counting if CLK_OPS_CORE_ENABLE is set */ + if (core->flags & CLK_OPS_CORE_ENABLE) + clk_core_disable_unprepare(core); + /* re-balance ref counting if CLK_OPS_PARENT_ENABLE is set */ if (core->flags & CLK_OPS_PARENT_ENABLE) { clk_core_disable_unprepare(parent); @@ -2973,6 +2981,7 @@ static int clk_dump_show(struct seq_file *s, void *data) ENTRY(CLK_IS_CRITICAL), ENTRY(CLK_OPS_PARENT_ENABLE), ENTRY(CLK_DUTY_CYCLE_PARENT), + ENTRY(CLK_OPS_CORE_ENABLE), #undef ENTRY }; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index bb6118f..39a1fed 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -34,6 +34,7 @@ #define CLK_OPS_PARENT_ENABLE BIT(12) /* duty cycle call may be forwarded to the parent clock */ #define CLK_DUTY_CYCLE_PARENT BIT(13) +#define CLK_OPS_CORE_ENABLE BIT(14) /* core need enable during re-parent */ struct clk; struct clk_hw; -- 1.8.1.1.dirty