linux-kernel - Re: [PATCH v2 28/43] drm/bridge: analogix_dp: Fix incorrect operations with register ANALOGIX_DP_FUNC_EN

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Message-ID: <20180129213559.dwcwup35whqzklfc@art_vandelay>
Date:   Mon, 29 Jan 2018 16:35:59 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     Thierry Escande <thierry.escande@...labora.com>
Cc:     Archit Taneja <architt@...eaurora.org>,
        Inki Dae <inki.dae@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandy Huang <hjc@...k-chips.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Tomasz Figa <tfiga@...omium.org>,
        Haixia Shi <hshi@...omium.org>,
        Ørjan Eide <orjan.eide@....com>,
        Zain Wang <wzz@...k-chips.com>,
        Yakir Yang <ykk@...k-chips.com>, Lin Huang <hl@...k-chips.com>,
        Douglas Anderson <dianders@...omium.org>,
        Mark Yao <mark.yao@...k-chips.com>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 28/43] drm/bridge: analogix_dp: Fix incorrect
 operations with register ANALOGIX_DP_FUNC_EN_1

On Fri, Jan 26, 2018 at 02:16:55PM +0100, Thierry Escande wrote:
> From: zain wang <wzz@...k-chips.com>
> 
> Register ANALOGIX_DP_FUNC_EN_1(offset 0x18), Rockchip is different to
> Exynos:
> 
> on Exynos edp phy,
> BIT 7		MASTER_VID_FUNC_EN_N
> BIT 6		reserved
> BIT 5		SLAVE_VID_FUNC_EN_N
> 
> on Rockchip edp phy,
> BIT 7		reserved
> BIT 6		RK_VID_CAP_FUNC_EN_N
> BIT 5		RK_VID_FIFO_FUNC_EN_N
> 
> So, we should do some private operations to Rockchip.
> 
> Cc: Tomasz Figa <tfiga@...omium.org>
> 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>
> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 19 ++++++++++++++-----
>  drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h |  2 ++
>  2 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 02ab1aaa9993..4eae206ec31b 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -126,9 +126,14 @@ void analogix_dp_reset(struct analogix_dp_device *dp)
>  	analogix_dp_stop_video(dp);
>  	analogix_dp_enable_video_mute(dp, 0);
>  
> -	reg = MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N |
> -		AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N |
> -		HDCP_FUNC_EN_N | SW_FUNC_EN_N;
> +	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
> +		reg = RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N |
> +			SW_FUNC_EN_N;
> +	else
> +		reg = MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N |
> +			AUD_FIFO_FUNC_EN_N | AUD_FUNC_EN_N |
> +			HDCP_FUNC_EN_N | SW_FUNC_EN_N;

The patch doesn't mention whether the other flags (AUD/HDCP) are relevant to
rockchip. Even in the CrOS tree we don't see these flags set for RK, so I guess
they're not. Would have been nice to know for certain. ¯\_(ツ)_/¯

Sean

> +
>  	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
>  
>  	reg = SSC_FUNC_EN_N | AUX_FUNC_EN_N |
> @@ -971,8 +976,12 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp)
>  	u32 reg;
>  
>  	reg = readl(dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
> -	reg &= ~(MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N);
> -	reg |= MASTER_VID_FUNC_EN_N;
> +	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
> +		reg &= ~(RK_VID_CAP_FUNC_EN_N | RK_VID_FIFO_FUNC_EN_N);
> +	} else {
> +		reg &= ~(MASTER_VID_FUNC_EN_N | SLAVE_VID_FUNC_EN_N);
> +		reg |= MASTER_VID_FUNC_EN_N;
> +	}
>  	writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_1);
>  
>  	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_10);
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> index b633a4a5082a..0cf27c731727 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.h
> @@ -127,7 +127,9 @@
>  
>  /* ANALOGIX_DP_FUNC_EN_1 */
>  #define MASTER_VID_FUNC_EN_N			(0x1 << 7)
> +#define RK_VID_CAP_FUNC_EN_N			(0x1 << 6)
>  #define SLAVE_VID_FUNC_EN_N			(0x1 << 5)
> +#define RK_VID_FIFO_FUNC_EN_N			(0x1 << 5)
>  #define AUD_FIFO_FUNC_EN_N			(0x1 << 4)
>  #define AUD_FUNC_EN_N				(0x1 << 3)
>  #define HDCP_FUNC_EN_N				(0x1 << 2)
> -- 
> 2.14.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS