linux-kernel - Re: [PATCH v4 1/6] drm: bridge: dw-hdmi: Extract PHY interrupt setup to a function

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Message-ID: <b8b3caca-d086-b390-a2fc-ef998e61e755@synopsys.com>
Date:   Wed, 22 Mar 2017 13:53:07 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        <dri-devel@...ts.freedesktop.org>,
        <laurent.pinchart+renesas@...asonboard.com>,
        <architt@...eaurora.org>
CC:     <Jose.Abreu@...opsys.com>, <kieran.bingham@...asonboard.com>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>
Subject: Re: [PATCH v4 1/6] drm: bridge: dw-hdmi: Extract PHY interrupt setup
 to a function

Hi Neil,


On 21-03-2017 15:12, Neil Armstrong wrote:
> From: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
>
> In preparation for adding PHY operations to handle RX SENSE and HPD,
> group all the PHY interrupt setup code in a single location and extract
> it to a separate function.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

Reviewed-by: Jose Abreu <joabreu@...opsys.com>

Maybe if you submit a next version we could get rid of
"dw_hdmi_fb_registered" totally and move the remaining setup code
to a new "dw_hdmi_setup_i2c" function.

Best regards,
Jose Miguel Abreu

> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 50 ++++++++++++++-----------------
>  1 file changed, 23 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index af93f7a..f82750a 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1559,7 +1559,7 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>  }
>  
>  /* Wait until we are registered to enable interrupts */
> -static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
> +static void dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>  {
>  	hdmi_writeb(hdmi, HDMI_PHY_I2CM_INT_ADDR_DONE_POL,
>  		    HDMI_PHY_I2CM_INT_ADDR);
> @@ -1567,15 +1567,6 @@ static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>  	hdmi_writeb(hdmi, HDMI_PHY_I2CM_CTLINT_ADDR_NAC_POL |
>  		    HDMI_PHY_I2CM_CTLINT_ADDR_ARBITRATION_POL,
>  		    HDMI_PHY_I2CM_CTLINT_ADDR);
> -
> -	/* enable cable hot plug irq */
> -	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> -
> -	/* Clear Hotplug interrupts */
> -	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> -		    HDMI_IH_PHY_STAT0);
> -
> -	return 0;
>  }
>  
>  static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
> @@ -1693,6 +1684,26 @@ static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
>  		hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
>  }
>  
> +static void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi)
> +{
> +	/*
> +	 * Configure the PHY RX SENSE and HPD interrupts polarities and clear
> +	 * any pending interrupt.
> +	 */
> +	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
> +	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> +		    HDMI_IH_PHY_STAT0);
> +
> +	/* Enable cable hot plug irq. */
> +	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> +
> +	/* Clear and unmute interrupts. */
> +	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> +		    HDMI_IH_PHY_STAT0);
> +	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
> +		    HDMI_IH_MUTE_PHY_STAT0);
> +}
> +
>  static enum drm_connector_status
>  dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
>  {
> @@ -2204,29 +2215,14 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
>  			hdmi->ddc = NULL;
>  	}
>  
> -	/*
> -	 * Configure registers related to HDMI interrupt
> -	 * generation before registering IRQ.
> -	 */
> -	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
> -
> -	/* Clear Hotplug interrupts */
> -	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> -		    HDMI_IH_PHY_STAT0);
> -
>  	hdmi->bridge.driver_private = hdmi;
>  	hdmi->bridge.funcs = &dw_hdmi_bridge_funcs;
>  #ifdef CONFIG_OF
>  	hdmi->bridge.of_node = pdev->dev.of_node;
>  #endif
>  
> -	ret = dw_hdmi_fb_registered(hdmi);
> -	if (ret)
> -		goto err_iahb;
> -
> -	/* Unmute interrupts */
> -	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE),
> -		    HDMI_IH_MUTE_PHY_STAT0);
> +	dw_hdmi_fb_registered(hdmi);
> +	dw_hdmi_phy_setup_hpd(hdmi);
>  
>  	memset(&pdevinfo, 0, sizeof(pdevinfo));
>  	pdevinfo.parent = dev;