[PATCH 3/3] phy: rockchip: Add Samsung HDMI/DP Combo PHY driver
Sascha Hauer
s.hauer at pengutronix.de
Mon Jan 22 04:14:09 PST 2024
On Fri, Jan 19, 2024 at 09:38:03PM +0200, Cristian Ciocaltea wrote:
> Add driver for the Rockchip HDMI/eDP TX Combo PHY found on RK3588 SoC.
>
> The PHY is based on a Samsung IP block and supports HDMI 2.1 TMDS, FRL
> and eDP links. The maximum data rate is 12Gbps (HDMI 2.1 FRL), while
> the minimum is 250Mbps (HDMI 2.1 TMDS).
>
> Co-developed-by: Algea Cao <algea.cao at rock-chips.com>
> Signed-off-by: Algea Cao <algea.cao at rock-chips.com>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
> ---
> drivers/phy/rockchip/Kconfig | 8 +
> drivers/phy/rockchip/Makefile | 1 +
> .../phy/rockchip/phy-rockchip-samsung-hdptx.c | 2045 +++++++++++++++++
> 3 files changed, 2054 insertions(+)
> create mode 100644 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
>
> diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
> index 94360fc96a6f..95666ac6aa3b 100644
> --- a/drivers/phy/rockchip/Kconfig
> +++ b/drivers/phy/rockchip/Kconfig
> @@ -83,6 +83,14 @@ config PHY_ROCKCHIP_PCIE
> help
> Enable this to support the Rockchip PCIe PHY.
>
> +config PHY_ROCKCHIP_SAMSUNG_HDPTX
> + tristate "Rockchip Samsung HDMI/DP Combo PHY driver"
> + depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
> + select GENERIC_PHY
> + help
> + Enable this to support the Rockchip HDMI/DP Combo PHY
> + with Samsung IP block.
> +
> config PHY_ROCKCHIP_SNPS_PCIE3
> tristate "Rockchip Snps PCIe3 PHY Driver"
> depends on (ARCH_ROCKCHIP && OF) || COMPILE_TEST
> diff --git a/drivers/phy/rockchip/Makefile b/drivers/phy/rockchip/Makefile
> index 7eab129230d1..3d911304e654 100644
> --- a/drivers/phy/rockchip/Makefile
> +++ b/drivers/phy/rockchip/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_PHY_ROCKCHIP_INNO_HDMI) += phy-rockchip-inno-hdmi.o
> obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2) += phy-rockchip-inno-usb2.o
> obj-$(CONFIG_PHY_ROCKCHIP_NANENG_COMBO_PHY) += phy-rockchip-naneng-combphy.o
> obj-$(CONFIG_PHY_ROCKCHIP_PCIE) += phy-rockchip-pcie.o
> +obj-$(CONFIG_PHY_ROCKCHIP_SAMSUNG_HDPTX) += phy-rockchip-samsung-hdptx.o
> obj-$(CONFIG_PHY_ROCKCHIP_SNPS_PCIE3) += phy-rockchip-snps-pcie3.o
> obj-$(CONFIG_PHY_ROCKCHIP_TYPEC) += phy-rockchip-typec.o
> obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
> diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> new file mode 100644
> index 000000000000..d8171ea5ce2b
> --- /dev/null
> +++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> @@ -0,0 +1,2045 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2021-2022 Rockchip Electronics Co., Ltd.
> + * Copyright (c) 2024 Collabora Ltd.
> + *
> + * Author: Algea Cao <algea.cao at rock-chips.com>
> + * Author: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
> + */
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/rational.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#define GRF_HDPTX_CON0 0x00
> +#define HDPTX_I_PLL_EN BIT(7)
> +#define HDPTX_I_BIAS_EN BIT(6)
> +#define HDPTX_I_BGR_EN BIT(5)
> +#define GRF_HDPTX_STATUS 0x80
> +#define HDPTX_O_PLL_LOCK_DONE BIT(3)
> +#define HDPTX_O_PHY_CLK_RDY BIT(2)
> +#define HDPTX_O_PHY_RDY BIT(1)
> +#define HDPTX_O_SB_RDY BIT(0)
> +
> +#define CMN_REG0000 0x0000
These register names are not particularly helpful. Maybe use a
#define CMN_REG(x) ((x) * 4)
Instead?
> +
> +static int hdptx_lcpll_frl_mode_config(struct rockchip_hdptx_phy *hdptx,
> + u32 rate)
> +{
> + u32 bit_rate = rate & DATA_RATE_MASK;
> + u8 color_depth = (rate & COLOR_DEPTH_MASK) ? 1 : 0;
> + const struct lcpll_config *cfg = lcpll_cfg;
> +
> + for (; cfg->bit_rate != ~0; cfg++)
> + if (bit_rate == cfg->bit_rate)
> + break;
You could use ARRAY_SIZE() to iterate over the array and save the extra
entry at the end. Likewise for the other arrays used in the driver.
> +
> + if (cfg->bit_rate == ~0)
> + return -EINVAL;
> +
> +static int rockchip_hdptx_phy_power_on(struct phy *phy)
> +{
> + struct rockchip_hdptx_phy *hdptx = phy_get_drvdata(phy);
> + int bus_width = phy_get_bus_width(hdptx->phy);
> + int bit_rate = bus_width & DATA_RATE_MASK;
What is going on here? bus_width is set to 8 in probe() using
phy_set_bus_width(), but the value you pull out of phy_get_bus_width()
is expected to contain the bit_rate and several other flags.
It looks like you are tunneling flags from some other driver using this
field. Isn't there a better way to accomplish this? If not, I think this
needs some explanation.
At least the variable should be renamed. it's called "bus_width" and it's
passed to functions like hdptx_lcpll_frl_mode_config() which has this
parameter named "rate" which is quite confusing.
Sascha
> + int ret;
> +
> + dev_dbg(hdptx->dev, "%s bus_width=%x rate=%d\n",
> + __func__, bus_width, bit_rate);
> +
> + ret = pm_runtime_resume_and_get(hdptx->dev);
> + if (ret) {
> + dev_err(hdptx->dev, "Failed to resume phy: %d\n", ret);
> + return ret;
> + }
> +
> + if (bus_width & HDMI_EARC_MASK)
> + hdptx->earc_en = true;
> + else
> + hdptx->earc_en = false;
> +
> + if (bus_width & HDMI_MODE_MASK) {
> + if (bit_rate > 24000000)
> + ret = hdptx_lcpll_frl_mode_config(hdptx, bus_width);
> + else
> + ret = hdptx_ropll_frl_mode_config(hdptx, bus_width);
> + } else {
> + ret = hdptx_ropll_tmds_mode_config(hdptx, bus_width);
> + }
> +
> + if (ret)
> + pm_runtime_put(hdptx->dev);
> +
> + return ret;
> +}
> +
--
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