Linux-PHY Archive on lore.kernel.org

* Re: [PATCH v2 1/2] phy: rockchip: inno-hdmi: Add configure() and validate() ops
From: Jonas Karlman @ 2026-05-10 18:43 UTC (permalink / raw)
  To: Vinod Koul, Neil Armstrong, Heiko Stuebner
  Cc: linux-phy, linux-rockchip, linux-arm-kernel, linux-kernel
In-Reply-To: <20260510095731.1222705-2-jonas@kwiboo.se>

On 5/10/2026 11:57 AM, Jonas Karlman wrote:
> The commit 10ed34d6eaaf ("phy: Add HDMI configuration options")
> introduced a way for HDMI PHYs to be configured through the generic
> phy_configure() function.
> 
> This driver derives the TMDS character rate from the pixel clock and the
> PHY bus width setting. However, no in-tree consumer of this PHY has ever
> called phy_set_bus_width() to change the TMDS character rate as only
> 8-bit RGB output is supported by the HDMI display driver.
> 
> Add configure() and validate() ops to allow consumers to configure the
> TMDS character rate using phy_configure(). Fallback to the deprecated
> way of using the PHY bus width to configure the TMDS character rate.

I have now posted a patch "drm/rockchip: dw_hdmi: Configure HDMI PHY
in atomic_mode_set()" [1] that adds phy_validate() and phy_configure()
calls for this HDMI PHY.

[1] https://lore.kernel.org/dri-devel/20260510183114.1248840-10-jonas@kwiboo.se/

Regards,
Jonas

> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
> Changes in v2:
> - Add validate() ops to validate that the TMDS rate is supported
> - Split out parts that remove the old workaround into a separate patch
> ---
>  drivers/phy/rockchip/phy-rockchip-inno-hdmi.c | 47 ++++++++++++++++++-
>  1 file changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
> index 1483907413fa..9cfe956fefe7 100644
> --- a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
> +++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
> @@ -245,6 +245,7 @@ struct inno_hdmi_phy {
>  	struct clk *phyclk;
>  	unsigned long pixclock;
>  	unsigned long tmdsclock;
> +	struct phy_configure_opts_hdmi hdmi_cfg;
>  };
>  
>  struct pre_pll_config {
> @@ -554,7 +555,12 @@ static inline void inno_update_bits(struct inno_hdmi_phy *inno, u8 reg,
>  static unsigned long inno_hdmi_phy_get_tmdsclk(struct inno_hdmi_phy *inno,
>  					       unsigned long rate)
>  {
> -	int bus_width = phy_get_bus_width(inno->phy);
> +	int bus_width;
> +
> +	if (inno->hdmi_cfg.tmds_char_rate)
> +		return inno->hdmi_cfg.tmds_char_rate;
> +
> +	bus_width = phy_get_bus_width(inno->phy);
>  
>  	switch (bus_width) {
>  	case 4:
> @@ -602,6 +608,42 @@ static irqreturn_t inno_hdmi_phy_rk3328_irq(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> +static int inno_hdmi_phy_validate(struct phy *phy, enum phy_mode mode,
> +				  int submode, union phy_configure_opts *opts)
> +{
> +	const struct pre_pll_config *cfg = pre_pll_cfg_table;
> +	unsigned long tmdsclock;
> +
> +	if (!(mode == PHY_MODE_HDMI && submode == PHY_HDMI_MODE_TMDS))
> +		return -EINVAL;
> +
> +	if (!opts->hdmi.tmds_char_rate || opts->hdmi.tmds_char_rate > 594000000)
> +		return -EINVAL;
> +
> +	tmdsclock = opts->hdmi.tmds_char_rate;
> +	for (; cfg->pixclock != 0; cfg++)
> +		if (cfg->pixclock == tmdsclock && cfg->tmdsclock == tmdsclock)
> +			return 0;
> +
> +	return -EINVAL;
> +}
> +
> +static int inno_hdmi_phy_configure(struct phy *phy,
> +				   union phy_configure_opts *opts)
> +{
> +	struct inno_hdmi_phy *inno = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = inno_hdmi_phy_validate(phy, phy_get_mode(phy),
> +				     PHY_HDMI_MODE_TMDS, opts);
> +	if (ret)
> +		return ret;
> +
> +	inno->hdmi_cfg = opts->hdmi;
> +
> +	return 0;
> +}
> +
>  static int inno_hdmi_phy_power_on(struct phy *phy)
>  {
>  	struct inno_hdmi_phy *inno = phy_get_drvdata(phy);
> @@ -670,6 +712,8 @@ static const struct phy_ops inno_hdmi_phy_ops = {
>  	.owner = THIS_MODULE,
>  	.power_on = inno_hdmi_phy_power_on,
>  	.power_off = inno_hdmi_phy_power_off,
> +	.configure = inno_hdmi_phy_configure,
> +	.validate = inno_hdmi_phy_validate,
>  };
>  
>  static const
> @@ -1392,6 +1436,7 @@ static int inno_hdmi_phy_probe(struct platform_device *pdev)
>  	}
>  
>  	phy_set_drvdata(inno->phy, inno);
> +	phy_set_mode_ext(inno->phy, PHY_MODE_HDMI, PHY_HDMI_MODE_TMDS);
>  	phy_set_bus_width(inno->phy, 8);
>  
>  	if (inno->plat_data->ops->init) {

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