linux-kernel - Re: [PATCH v5 08/36] drm/bridge: analogix_dp: Check AUX

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Date:   Wed, 14 Mar 2018 11:31:28 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        inki.dae@...sung.com, thierry.reding@...il.com, hjc@...k-chips.com,
        seanpaul@...omium.org, airlied@...ux.ie, tfiga@...omium.org,
        heiko@...ech.de
Cc:     dri-devel@...ts.freedesktop.org, dianders@...omium.org,
        a.hajda@...sung.com, ykk@...k-chips.com, kernel@...labora.com,
        m.szyprowski@...sung.com, linux-samsung-soc@...r.kernel.org,
        jy0922.shim@...sung.com, rydberg@...math.org, krzk@...nel.org,
        linux-rockchip@...ts.infradead.org, kgene@...nel.org,
        linux-input@...r.kernel.org, orjan.eide@....com,
        wxt@...k-chips.com, jeffy.chen@...k-chips.com,
        linux-arm-kernel@...ts.infradead.org, mark.yao@...k-chips.com,
        wzz@...k-chips.com, hl@...k-chips.com, jingoohan1@...il.com,
        sw0312.kim@...sung.com, linux-kernel@...r.kernel.org,
        kyungmin.park@...sung.com, Laurent.pinchart@...asonboard.com,
        kuankuan.y@...il.com, hshi@...omium.org,
        Stéphane Marchesin <marcheu@...omium.org>
Subject: Re: [PATCH v5 08/36] drm/bridge: analogix_dp: Check AUX_EN status
 when doing AUX transfer



On Saturday 10 March 2018 03:52 AM, Enric Balletbo i Serra wrote:
> From: Lin Huang <hl@...k-chips.com>
> 
> We should check AUX_EN bit to confirm the AUX CH operation is completed.
> 

Reviewed-by: Archit Taneja <architt@...eaurora.org>

Thanks,
Archit

> Cc: Stéphane Marchesin <marcheu@...omium.org>
> Signed-off-by: Lin Huang <hl@...k-chips.com>
> Signed-off-by: zain wang <wzz@...k-chips.com>
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> 
>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 25 +++++++++++++----------
>   1 file changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 9df2f3ef000c..e78c861b9e06 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -1073,9 +1073,9 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>   {
>   	u32 reg;
>   	u8 *buffer = msg->buffer;
> -	int timeout_loop = 0;
>   	unsigned int i;
>   	int num_transferred = 0;
> +	int ret;
>   
>   	/* Buffer size of AUX CH is 16 bytes */
>   	if (WARN_ON(msg->size > 16))
> @@ -1139,17 +1139,20 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>   
>   	writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2);
>   
> -	/* Is AUX CH command reply received? */
> +	ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2,
> +				 reg, !(reg & AUX_EN), 25, 500 * 1000);
> +	if (ret) {
> +		dev_err(dp->dev, "AUX CH enable timeout!\n");
> +		return -ETIMEDOUT;
> +	}
> +
>   	/* TODO: Wait for an interrupt instead of looping? */
> -	reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
> -	while (!(reg & RPLY_RECEIV)) {
> -		timeout_loop++;
> -		if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
> -			dev_err(dp->dev, "AUX CH command reply failed!\n");
> -			return -ETIMEDOUT;
> -		}
> -		reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
> -		usleep_range(10, 11);
> +	/* Is AUX CH command reply received? */
> +	ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_INT_STA,
> +				 reg, reg & RPLY_RECEIV, 10, 20 * 1000);
> +	if (ret) {
> +		dev_err(dp->dev, "AUX CH cmd reply timeout!\n");
> +		return -ETIMEDOUT;
>   	}
>   
>   	/* Clear interrupt source for AUX CH command reply */
>