Re: [PATCH v2 04/15] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support

Maxime Ripard
2018-10-24T18:06:44Z

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On Tue, Oct 23, 2018 at 09:20:24PM +0530, Jagan Teki wrote:
> The MIPI DSI controller on Allwinner A64 is similar to
> Allwinner A31 without support of DSI mod clock(CLK_DSI_SCLK)
>
> So, alter has_mod_clk bool via driver data for respective
> SoC's compatible.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Changes for v2:
> - none
>
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 47 ++++++++++++++++++++------
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 5 +++
> 2 files changed, 41 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index e3b34a345546..8e9c76febca2 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -10,6 +10,7 @@
> #include <linux/component.h>
> #include <linux/crc-ccitt.h>
> #include <linux/of_address.h>
> +#include <linux/of_device.h>
> #include <linux/pm_runtime.h>
> #include <linux/regmap.h>
> #include <linux/reset.h>
> @@ -981,6 +982,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> dsi->host.ops = &sun6i_dsi_host_ops;
> dsi->host.dev = dev;
>
> + dsi->variant = of_device_get_match_data(dev);
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> base = devm_ioremap_resource(dev, res);
> if (IS_ERR(base)) {
> @@ -1001,17 +1004,20 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> return PTR_ERR(dsi->reset);
> }
>
> - dsi->mod_clk = devm_clk_get(dev, "mod");
> - if (IS_ERR(dsi->mod_clk)) {
> - dev_err(dev, "Couldn't get the DSI mod clock\n");
> - return PTR_ERR(dsi->mod_clk);
> + if (dsi->variant->has_mod_clk) {
> + dsi->mod_clk = devm_clk_get(dev, "mod");
> + if (IS_ERR(dsi->mod_clk)) {
> + dev_err(dev, "Couldn't get the DSI mod clock\n");
> + return PTR_ERR(dsi->mod_clk);
> + }
> }
>
> /*
> * In order to operate properly, that clock seems to be always
> * set to 297MHz.
> */
> - clk_set_rate_exclusive(dsi->mod_clk, 297000000);
> + if (dsi->variant->has_mod_clk)
> + clk_set_rate_exclusive(dsi->mod_clk, 297000000);
>
> dphy_node = of_parse_phandle(dev->of_node, "phys", 0);
> ret = sun6i_dphy_probe(dsi, dphy_node);
> @@ -1043,7 +1049,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> pm_runtime_disable(dev);
> sun6i_dphy_remove(dsi);
> err_unprotect_clk:
> - clk_rate_exclusive_put(dsi->mod_clk);
> + if (dsi->variant->has_mod_clk)
> + clk_rate_exclusive_put(dsi->mod_clk);
> return ret;
> }
>
> @@ -1056,7 +1063,8 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
> mipi_dsi_host_unregister(&dsi->host);
> pm_runtime_disable(dev);
> sun6i_dphy_remove(dsi);
> - clk_rate_exclusive_put(dsi->mod_clk);
> + if (dsi->variant->has_mod_clk)
> + clk_rate_exclusive_put(dsi->mod_clk);
>
> return 0;
> }
> @@ -1066,7 +1074,8 @@ static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
> struct sun6i_dsi *dsi = dev_get_drvdata(dev);
>
> reset_control_deassert(dsi->reset);
> - clk_prepare_enable(dsi->mod_clk);
> + if (dsi->variant->has_mod_clk)
> + clk_prepare_enable(dsi->mod_clk);
>
> /*
> * Enable the DSI block.
> @@ -1094,7 +1103,8 @@ static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev)
> {
> struct sun6i_dsi *dsi = dev_get_drvdata(dev);
>
> - clk_disable_unprepare(dsi->mod_clk);
> + if (dsi->variant->has_mod_clk)
> + clk_disable_unprepare(dsi->mod_clk);
> reset_control_assert(dsi->reset);
>
> return 0;
> @@ -1106,9 +1116,24 @@ static const struct dev_pm_ops sun6i_dsi_pm_ops = {
> NULL)
> };
>
> +static const struct sun6i_dsi_variant sun6i_a31_dsi = {
> + .has_mod_clk = true,
> +};
> +
> +static const struct sun6i_dsi_variant sun50i_a64_dsi = {
> + .has_mod_clk = false,

This is the default already.

> +};
> +
> static const struct of_device_id sun6i_dsi_of_table[] = {
> - { .compatible = "allwinner,sun6i-a31-mipi-dsi" },
> - { }
> + {
> + .compatible = "allwinner,sun6i-a31-mipi-dsi",
> + .data = &sun6i_a31_dsi,
> + },
> + {
> + .compatible = "allwinner,sun50i-a64-mipi-dsi",
> + .data = &sun50i_a64_dsi,
> + },
> + { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> index dbbc5b3ecbda..597b62227019 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> @@ -20,6 +20,10 @@ struct sun6i_dphy {
> struct reset_control *reset;
> };
>
> +struct sun6i_dsi_variant {
> + bool has_mod_clk;
> +};
> +

This should be part of a separate patch.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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