From: Heiko Stuebner <heiko@sntech.de> To: linux-clk@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, mturquette@baylibre.com, sboyd@kernel.org, heiko@sntech.de, christoph.muellner@theobroma-systems.com, zhangqing@rock-chips.com, Heiko Stuebner <heiko.stuebner@theobroma-systems.com> Subject: [PATCH 2/3] clk: rockchip: convert basic pll lock_wait to use regmap_read_poll_timeout Date: Tue, 28 Jan 2020 11:02:02 +0100 [thread overview] Message-ID: <20200128100204.1318450-2-heiko@sntech.de> (raw) In-Reply-To: <20200128100204.1318450-1-heiko@sntech.de> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com> Instead of open coding the polling of the lock status, use the handy regmap_read_poll_timeout for this. As the pll locking is normally blazingly fast and we don't want to incur additional delays, we're not doing any sleeps similar to for example the imx clk-pllv4 and define a very safe but still short timeout of 1ms. Suggested-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com> --- drivers/clk/rockchip/clk-pll.c | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-) diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c index 43c9fd0086a2..26ca46d49191 100644 --- a/drivers/clk/rockchip/clk-pll.c +++ b/drivers/clk/rockchip/clk-pll.c @@ -86,23 +86,14 @@ static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll) { struct regmap *grf = pll->ctx->grf; unsigned int val; - int delay = 24000000, ret; - - while (delay > 0) { - ret = regmap_read(grf, pll->lock_offset, &val); - if (ret) { - pr_err("%s: failed to read pll lock status: %d\n", - __func__, ret); - return ret; - } + int ret; - if (val & BIT(pll->lock_shift)) - return 0; - delay--; - } + ret = regmap_read_poll_timeout(grf, pll->lock_offset, val, + val & BIT(pll->lock_shift), 0, 1000); + if (ret) + pr_err("%s: timeout waiting for pll to lock\n", __func__); - pr_err("%s: timeout waiting for pll to lock\n", __func__); - return -ETIMEDOUT; + return ret; } /** -- 2.24.1
WARNING: multiple messages have this Message-ID (diff)
From: Heiko Stuebner <heiko@sntech.de> To: linux-clk@vger.kernel.org Cc: heiko@sntech.de, sboyd@kernel.org, Heiko Stuebner <heiko.stuebner@theobroma-systems.com>, mturquette@baylibre.com, zhangqing@rock-chips.com, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, christoph.muellner@theobroma-systems.com Subject: [PATCH 2/3] clk: rockchip: convert basic pll lock_wait to use regmap_read_poll_timeout Date: Tue, 28 Jan 2020 11:02:02 +0100 [thread overview] Message-ID: <20200128100204.1318450-2-heiko@sntech.de> (raw) In-Reply-To: <20200128100204.1318450-1-heiko@sntech.de> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com> Instead of open coding the polling of the lock status, use the handy regmap_read_poll_timeout for this. As the pll locking is normally blazingly fast and we don't want to incur additional delays, we're not doing any sleeps similar to for example the imx clk-pllv4 and define a very safe but still short timeout of 1ms. Suggested-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com> --- drivers/clk/rockchip/clk-pll.c | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-) diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c index 43c9fd0086a2..26ca46d49191 100644 --- a/drivers/clk/rockchip/clk-pll.c +++ b/drivers/clk/rockchip/clk-pll.c @@ -86,23 +86,14 @@ static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll) { struct regmap *grf = pll->ctx->grf; unsigned int val; - int delay = 24000000, ret; - - while (delay > 0) { - ret = regmap_read(grf, pll->lock_offset, &val); - if (ret) { - pr_err("%s: failed to read pll lock status: %d\n", - __func__, ret); - return ret; - } + int ret; - if (val & BIT(pll->lock_shift)) - return 0; - delay--; - } + ret = regmap_read_poll_timeout(grf, pll->lock_offset, val, + val & BIT(pll->lock_shift), 0, 1000); + if (ret) + pr_err("%s: timeout waiting for pll to lock\n", __func__); - pr_err("%s: timeout waiting for pll to lock\n", __func__); - return -ETIMEDOUT; + return ret; } /** -- 2.24.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-01-28 10:02 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-01-28 10:02 [PATCH 1/3] clk: rockchip: convert rk3399 pll type to use readl_poll_timeout Heiko Stuebner 2020-01-28 10:02 ` Heiko Stuebner 2020-01-28 10:02 ` Heiko Stuebner [this message] 2020-01-28 10:02 ` [PATCH 2/3] clk: rockchip: convert basic pll lock_wait to use regmap_read_poll_timeout Heiko Stuebner 2020-01-28 10:02 ` [PATCH 3/3] clk: rockchip: convert rk3036 pll type to use internal lock status Heiko Stuebner 2020-01-28 10:02 ` Heiko Stuebner 2020-01-28 15:28 ` [PATCH 1/3] clk: rockchip: convert rk3399 pll type to use readl_poll_timeout Robin Murphy 2020-01-28 15:28 ` Robin Murphy 2020-01-28 16:29 ` Heiko Stuebner 2020-01-28 16:29 ` Heiko Stuebner 2020-01-28 18:43 ` Robin Murphy 2020-01-28 18:43 ` Robin Murphy
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