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Date: Wed, 13 Jan 2021 14:36:33 +0000
From: Sean Young <sean@...s.org>
To: Samuel Holland <samuel@...lland.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Maxime Ripard <mripard@...nel.org>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...l.net>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-sunxi@...glegroups.com
Subject: Re: [PATCH 3/4] media: sunxi-cir: Factor out hardware initialization
On Tue, Jan 12, 2021 at 10:51:31PM -0600, Samuel Holland wrote:
> In preparation for adding suspend/resume hooks, factor out the hardware
> initialization from the driver probe/remove functions.
>
> The timeout programmed during init is taken from the `struct rc_dev` so
> it is maintained across an exit/init cycle.
>
> This resolves some trivial issues with the probe function: throwing away
> the error from clk_prepare_enable and using the wrong type for the
> temporary register value.
>
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> drivers/media/rc/sunxi-cir.c | 128 ++++++++++++++++++++---------------
> 1 file changed, 74 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
> index 48be400421cd..ccb9d6b4225d 100644
> --- a/drivers/media/rc/sunxi-cir.c
> +++ b/drivers/media/rc/sunxi-cir.c
> @@ -169,10 +169,74 @@ static int sunxi_ir_set_timeout(struct rc_dev *rc_dev, unsigned int timeout)
> return 0;
> }
>
> +static int sunxi_ir_hw_init(struct device *dev)
> +{
> + struct sunxi_ir *ir = dev_get_drvdata(dev);
> + u32 tmp;
> + int ret;
> +
> + ret = reset_control_deassert(ir->rst);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(ir->apb_clk);
> + if (ret) {
> + dev_err(dev, "failed to enable apb clk\n");
> + goto exit_assert_reset;
> + }
> +
> + ret = clk_prepare_enable(ir->clk);
> + if (ret) {
> + dev_err(dev, "failed to enable ir clk\n");
> + goto exit_disable_apb_clk;
> + }
> +
> + /* Enable CIR Mode */
> + writel(REG_CTL_MD, ir->base + SUNXI_IR_CTL_REG);
> +
> + /* Set noise threshold and idle threshold */
> + sunxi_ir_set_timeout(ir->rc, ir->rc->timeout);
> +
> + /* Invert Input Signal */
> + writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG);
> +
> + /* Clear All Rx Interrupt Status */
> + writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
> +
> + /*
> + * Enable IRQ on overflow, packet end, FIFO available with trigger
> + * level
> + */
> + writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN |
> + REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1),
> + ir->base + SUNXI_IR_RXINT_REG);
> +
> + /* Enable IR Module */
> + tmp = readl(ir->base + SUNXI_IR_CTL_REG);
> + writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG);
> +
> + return 0;
> +
> +exit_disable_apb_clk:
> + clk_disable_unprepare(ir->apb_clk);
> +exit_assert_reset:
> + reset_control_assert(ir->rst);
> +
> + return ret;
> +}
> +
> +static void sunxi_ir_hw_exit(struct device *dev)
> +{
> + struct sunxi_ir *ir = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(ir->clk);
> + clk_disable_unprepare(ir->apb_clk);
> + reset_control_assert(ir->rst);
> +}
> +
> static int sunxi_ir_probe(struct platform_device *pdev)
> {
> int ret = 0;
> - unsigned long tmp = 0;
>
> struct device *dev = &pdev->dev;
> struct device_node *dn = dev->of_node;
> @@ -213,43 +277,26 @@ static int sunxi_ir_probe(struct platform_device *pdev)
> ir->rst = devm_reset_control_get_exclusive(dev, NULL);
> if (IS_ERR(ir->rst))
> return PTR_ERR(ir->rst);
> - ret = reset_control_deassert(ir->rst);
> - if (ret)
> - return ret;
> }
>
> ret = clk_set_rate(ir->clk, b_clk_freq);
> if (ret) {
> dev_err(dev, "set ir base clock failed!\n");
> - goto exit_reset_assert;
> + return ret;
> }
> dev_dbg(dev, "set base clock frequency to %d Hz.\n", b_clk_freq);
>
> - if (clk_prepare_enable(ir->apb_clk)) {
> - dev_err(dev, "try to enable apb_ir_clk failed\n");
> - ret = -EINVAL;
> - goto exit_reset_assert;
> - }
> -
> - if (clk_prepare_enable(ir->clk)) {
> - dev_err(dev, "try to enable ir_clk failed\n");
> - ret = -EINVAL;
> - goto exit_clkdisable_apb_clk;
> - }
> -
> /* IO */
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> ir->base = devm_ioremap_resource(dev, res);
> if (IS_ERR(ir->base)) {
> - ret = PTR_ERR(ir->base);
> - goto exit_clkdisable_clk;
> + return PTR_ERR(ir->base);
> }
>
> ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW);
> if (!ir->rc) {
> dev_err(dev, "failed to allocate device\n");
> - ret = -ENOMEM;
> - goto exit_clkdisable_clk;
> + return -ENOMEM;
> }
>
> ir->rc->priv = ir;
> @@ -265,6 +312,7 @@ static int sunxi_ir_probe(struct platform_device *pdev)
> ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
> /* Frequency after IR internal divider with sample period in us */
> ir->rc->rx_resolution = (USEC_PER_SEC / (b_clk_freq / 64));
> + ir->rc->timeout = IR_DEFAULT_TIMEOUT;
Why? This is set from sunxi_ir_set_timeout().
> ir->rc->min_timeout = sunxi_ithr_to_usec(b_clk_freq, 0);
> ir->rc->max_timeout = sunxi_ithr_to_usec(b_clk_freq, 255);
> ir->rc->s_timeout = sunxi_ir_set_timeout;
> @@ -291,41 +339,15 @@ static int sunxi_ir_probe(struct platform_device *pdev)
> goto exit_free_dev;
> }
>
> - /* Enable CIR Mode */
> - writel(REG_CTL_MD, ir->base+SUNXI_IR_CTL_REG);
> -
> - /* Set noise threshold and idle threshold */
> - sunxi_ir_set_timeout(ir->rc, IR_DEFAULT_TIMEOUT);
> -
> - /* Invert Input Signal */
> - writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG);
> -
> - /* Clear All Rx Interrupt Status */
> - writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG);
> -
> - /*
> - * Enable IRQ on overflow, packet end, FIFO available with trigger
> - * level
> - */
> - writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN |
> - REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1),
> - ir->base + SUNXI_IR_RXINT_REG);
> -
> - /* Enable IR Module */
> - tmp = readl(ir->base + SUNXI_IR_CTL_REG);
> - writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG);
> + ret = sunxi_ir_hw_init(dev);
> + if (ret)
> + goto exit_free_dev;
>
> dev_info(dev, "initialized sunXi IR driver\n");
> return 0;
>
> exit_free_dev:
> rc_free_device(ir->rc);
> -exit_clkdisable_clk:
> - clk_disable_unprepare(ir->clk);
> -exit_clkdisable_apb_clk:
> - clk_disable_unprepare(ir->apb_clk);
> -exit_reset_assert:
> - reset_control_assert(ir->rst);
>
> return ret;
> }
> @@ -334,11 +356,9 @@ static int sunxi_ir_remove(struct platform_device *pdev)
> {
> struct sunxi_ir *ir = platform_get_drvdata(pdev);
>
> - clk_disable_unprepare(ir->clk);
> - clk_disable_unprepare(ir->apb_clk);
> - reset_control_assert(ir->rst);
> -
> + sunxi_ir_hw_exit(&pdev->dev);
> rc_unregister_device(ir->rc);
> +
> return 0;
> }
>
> --
> 2.26.2
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