From: Michael Tretter <m.tretter@pengutronix.de> To: linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org Cc: m.mtretter@pengutronix.de, michals@xilinx.com, kernel@pengutronix.de, mturquette@baylibre.com, sboyd@kernel.org Subject: [PATCH v3 04/15] soc: xilinx: vcu: add helper to wait for PLL locked Date: Thu, 21 Jan 2021 08:16:48 +0100 [thread overview] Message-ID: <20210121071659.1226489-5-m.tretter@pengutronix.de> (raw) In-Reply-To: <20210121071659.1226489-1-m.tretter@pengutronix.de> Extract a helper function to wait until the PLL is locked. Also, disabling the bypass was buried in the exit path on the wait loop. Separate the different steps and add a helper function to make the code more readable. Signed-off-by: Michael Tretter <m.tretter@pengutronix.de> Acked-by: Michal Simek <michal.simek@xilinx.com> --- Changelog: v3: none v2: none --- drivers/soc/xilinx/xlnx_vcu.c | 46 ++++++++++++++++++++--------------- 1 file changed, 27 insertions(+), 19 deletions(-) diff --git a/drivers/soc/xilinx/xlnx_vcu.c b/drivers/soc/xilinx/xlnx_vcu.c index 7da9643820a8..0fd8356a3776 100644 --- a/drivers/soc/xilinx/xlnx_vcu.c +++ b/drivers/soc/xilinx/xlnx_vcu.c @@ -256,6 +256,22 @@ static void xvcu_write_field_reg(void __iomem *iomem, int offset, xvcu_write(iomem, offset, val); } +static int xvcu_pll_wait_for_lock(struct xvcu_device *xvcu) +{ + void __iomem *base = xvcu->vcu_slcr_ba; + unsigned long timeout; + u32 lock_status; + + timeout = jiffies + msecs_to_jiffies(2000); + do { + lock_status = xvcu_read(base, VCU_PLL_STATUS); + if (lock_status & VCU_PLL_STATUS_LOCK_STATUS_MASK) + return 0; + } while (!time_after(jiffies, timeout)); + + return -ETIMEDOUT; +} + /** * xvcu_set_vcu_pll_info - Set the VCU PLL info * @xvcu: Pointer to the xvcu_device structure @@ -428,8 +444,6 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) */ static int xvcu_set_pll(struct xvcu_device *xvcu) { - u32 lock_status; - unsigned long timeout; int ret; ret = xvcu_set_vcu_pll_info(xvcu); @@ -447,24 +461,18 @@ static int xvcu_set_pll(struct xvcu_device *xvcu) xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, 0, VCU_PLL_CTRL_RESET_MASK, VCU_PLL_CTRL_RESET_SHIFT); - /* - * Defined the timeout for the max time to wait the - * PLL_STATUS to be locked. - */ - timeout = jiffies + msecs_to_jiffies(2000); - do { - lock_status = xvcu_read(xvcu->vcu_slcr_ba, VCU_PLL_STATUS); - if (lock_status & VCU_PLL_STATUS_LOCK_STATUS_MASK) { - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 0, VCU_PLL_CTRL_BYPASS_MASK, - VCU_PLL_CTRL_BYPASS_SHIFT); - return 0; - } - } while (!time_after(jiffies, timeout)); - /* PLL is not locked even after the timeout of the 2sec */ - dev_err(xvcu->dev, "PLL is not locked\n"); - return -ETIMEDOUT; + ret = xvcu_pll_wait_for_lock(xvcu); + if (ret) { + dev_err(xvcu->dev, "PLL is not locked\n"); + return ret; + } + + xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, + 0, VCU_PLL_CTRL_BYPASS_MASK, + VCU_PLL_CTRL_BYPASS_SHIFT); + + return ret; } /** -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Michael Tretter <m.tretter@pengutronix.de> To: linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org Cc: sboyd@kernel.org, mturquette@baylibre.com, m.mtretter@pengutronix.de, michals@xilinx.com, kernel@pengutronix.de Subject: [PATCH v3 04/15] soc: xilinx: vcu: add helper to wait for PLL locked Date: Thu, 21 Jan 2021 08:16:48 +0100 [thread overview] Message-ID: <20210121071659.1226489-5-m.tretter@pengutronix.de> (raw) In-Reply-To: <20210121071659.1226489-1-m.tretter@pengutronix.de> Extract a helper function to wait until the PLL is locked. Also, disabling the bypass was buried in the exit path on the wait loop. Separate the different steps and add a helper function to make the code more readable. Signed-off-by: Michael Tretter <m.tretter@pengutronix.de> Acked-by: Michal Simek <michal.simek@xilinx.com> --- Changelog: v3: none v2: none --- drivers/soc/xilinx/xlnx_vcu.c | 46 ++++++++++++++++++++--------------- 1 file changed, 27 insertions(+), 19 deletions(-) diff --git a/drivers/soc/xilinx/xlnx_vcu.c b/drivers/soc/xilinx/xlnx_vcu.c index 7da9643820a8..0fd8356a3776 100644 --- a/drivers/soc/xilinx/xlnx_vcu.c +++ b/drivers/soc/xilinx/xlnx_vcu.c @@ -256,6 +256,22 @@ static void xvcu_write_field_reg(void __iomem *iomem, int offset, xvcu_write(iomem, offset, val); } +static int xvcu_pll_wait_for_lock(struct xvcu_device *xvcu) +{ + void __iomem *base = xvcu->vcu_slcr_ba; + unsigned long timeout; + u32 lock_status; + + timeout = jiffies + msecs_to_jiffies(2000); + do { + lock_status = xvcu_read(base, VCU_PLL_STATUS); + if (lock_status & VCU_PLL_STATUS_LOCK_STATUS_MASK) + return 0; + } while (!time_after(jiffies, timeout)); + + return -ETIMEDOUT; +} + /** * xvcu_set_vcu_pll_info - Set the VCU PLL info * @xvcu: Pointer to the xvcu_device structure @@ -428,8 +444,6 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) */ static int xvcu_set_pll(struct xvcu_device *xvcu) { - u32 lock_status; - unsigned long timeout; int ret; ret = xvcu_set_vcu_pll_info(xvcu); @@ -447,24 +461,18 @@ static int xvcu_set_pll(struct xvcu_device *xvcu) xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, 0, VCU_PLL_CTRL_RESET_MASK, VCU_PLL_CTRL_RESET_SHIFT); - /* - * Defined the timeout for the max time to wait the - * PLL_STATUS to be locked. - */ - timeout = jiffies + msecs_to_jiffies(2000); - do { - lock_status = xvcu_read(xvcu->vcu_slcr_ba, VCU_PLL_STATUS); - if (lock_status & VCU_PLL_STATUS_LOCK_STATUS_MASK) { - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 0, VCU_PLL_CTRL_BYPASS_MASK, - VCU_PLL_CTRL_BYPASS_SHIFT); - return 0; - } - } while (!time_after(jiffies, timeout)); - /* PLL is not locked even after the timeout of the 2sec */ - dev_err(xvcu->dev, "PLL is not locked\n"); - return -ETIMEDOUT; + ret = xvcu_pll_wait_for_lock(xvcu); + if (ret) { + dev_err(xvcu->dev, "PLL is not locked\n"); + return ret; + } + + xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, + 0, VCU_PLL_CTRL_BYPASS_MASK, + VCU_PLL_CTRL_BYPASS_SHIFT); + + return ret; } /** -- 2.20.1 _______________________________________________ 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:[~2021-01-21 7:19 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-21 7:16 [PATCH v3 00/15] soc: xilinx: vcu: Convert driver to clock provider Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-01-21 7:16 ` [PATCH v3 01/15] ARM: dts: vcu: define indexes for output clocks Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 02/15] clk: divider: fix initialization with parent_hw Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 03/15] soc: xilinx: vcu: drop coreclk from struct xlnx_vcu Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` Michael Tretter [this message] 2021-01-21 7:16 ` [PATCH v3 04/15] soc: xilinx: vcu: add helper to wait for PLL locked Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 05/15] soc: xilinx: vcu: add helpers for configuring PLL Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 06/15] soc: xilinx: vcu: implement PLL disable Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 07/15] soc: xilinx: vcu: register PLL as fixed rate clock Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:32 ` Stephen Boyd 2021-02-09 2:32 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 08/15] soc: xilinx: vcu: implement clock provider for output clocks Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 09/15] soc: xilinx: vcu: make pll post divider explicit Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 10/15] soc: xilinx: vcu: make the PLL configurable Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 11/15] soc: xilinx: vcu: remove calculation of PLL configuration Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 12/15] soc: xilinx: vcu: use bitfields for register definition Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 13/15] soc: xilinx: vcu: fix repeated word the in comment Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 14/15] soc: xilinx: vcu: fix alignment to open parenthesis Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd 2021-01-21 7:16 ` [PATCH v3 15/15] clk: xilinx: move xlnx_vcu clock driver from soc Michael Tretter 2021-01-21 7:16 ` Michael Tretter 2021-02-09 2:35 ` Stephen Boyd 2021-02-09 2:35 ` Stephen Boyd
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