linux-kernel - Re: [PATCH v2 2/7] phy: qcom: qmp-combo: store DP phy power state

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Date: Mon, 27 May 2024 11:59:02 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] phy: qcom: qmp-combo: store DP phy power state

On Mon, May 27, 2024 at 10:42:34AM +0200, Neil Armstrong wrote:
> Switching the PHY Mode requires the DisplayPort PHY to be powered off,
> keep track of the DisplayPort phy power state.

How is this different from dp_init_count?

> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 7f999e8a433d..183cd9cd1884 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -1512,6 +1512,7 @@ struct qmp_combo {
>  	unsigned int dp_aux_cfg;
>  	struct phy_configure_opts_dp dp_opts;
>  	unsigned int dp_init_count;
> +	bool dp_powered_on;
>  
>  	struct clk_fixed_rate pipe_clk_fixed;
>  	struct clk_hw dp_link_hw;
> @@ -2685,6 +2686,8 @@ static int qmp_combo_dp_power_on(struct phy *phy)
>  	/* Configure link rate, swing, etc. */
>  	cfg->configure_dp_phy(qmp);
>  
> +	qmp->dp_powered_on = true;
> +
>  	mutex_unlock(&qmp->phy_mutex);
>  
>  	return 0;
> @@ -2699,6 +2702,8 @@ static int qmp_combo_dp_power_off(struct phy *phy)
>  	/* Assert DP PHY power down */
>  	writel(DP_PHY_PD_CTL_PSR_PWRDN, qmp->dp_dp_phy + QSERDES_DP_PHY_PD_CTL);
>  
> +	qmp->dp_powered_on = false;
> +
>  	mutex_unlock(&qmp->phy_mutex);
>  
>  	return 0;
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry