linux-kernel - Re: [PATCH RFC 7/7] drm/display: dp-tunnel: use new DCPD access helpers

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Message-ID: <04a1508371a17da91a56f4dfba46ee63a3cb2554.camel@redhat.com>
Date: Tue, 18 Feb 2025 16:43:29 -0500
From: Lyude Paul <lyude@...hat.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Maarten Lankhorst	
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Rob Clark	 <robdclark@...il.com>, Abhinav
 Kumar <quic_abhinavk@...cinc.com>, Sean Paul	 <sean@...rly.run>, Marijn
 Suijten <marijn.suijten@...ainline.org>, Jani Nikula	
 <jani.nikula@...ux.intel.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH RFC 7/7] drm/display: dp-tunnel: use new DCPD access
 helpers

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Fri, 2025-01-17 at 10:56 +0200, Dmitry Baryshkov wrote:
> Switch drm_dp_tunnel.c to use new set of DPCD read / write helpers.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/display/drm_dp_tunnel.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/display/drm_dp_tunnel.c b/drivers/gpu/drm/display/drm_dp_tunnel.c
> index 48b2df120086c9b64f7d8b732c9f1f32f7b50fbd..4ef1f20bfe4a0648a92345a80fc6658ab23c5003 100644
> --- a/drivers/gpu/drm/display/drm_dp_tunnel.c
> +++ b/drivers/gpu/drm/display/drm_dp_tunnel.c
> @@ -222,7 +222,7 @@ static int read_tunnel_regs(struct drm_dp_aux *aux, struct drm_dp_tunnel_regs *r
>  	while ((len = next_reg_area(&offset))) {
>  		int address = DP_TUNNELING_BASE + offset;
>  
> -		if (drm_dp_dpcd_read(aux, address, tunnel_reg_ptr(regs, address), len) < 0)
> +		if (drm_dp_dpcd_read_data(aux, address, tunnel_reg_ptr(regs, address), len) < 0)
>  			return -EIO;
>  
>  		offset += len;
> @@ -913,7 +913,7 @@ static int set_bw_alloc_mode(struct drm_dp_tunnel *tunnel, bool enable)
>  	u8 mask = DP_DISPLAY_DRIVER_BW_ALLOCATION_MODE_ENABLE | DP_UNMASK_BW_ALLOCATION_IRQ;
>  	u8 val;
>  
> -	if (drm_dp_dpcd_readb(tunnel->aux, DP_DPTX_BW_ALLOCATION_MODE_CONTROL, &val) < 0)
> +	if (drm_dp_dpcd_read_byte(tunnel->aux, DP_DPTX_BW_ALLOCATION_MODE_CONTROL, &val) < 0)
>  		goto out_err;
>  
>  	if (enable)
> @@ -921,7 +921,7 @@ static int set_bw_alloc_mode(struct drm_dp_tunnel *tunnel, bool enable)
>  	else
>  		val &= ~mask;
>  
> -	if (drm_dp_dpcd_writeb(tunnel->aux, DP_DPTX_BW_ALLOCATION_MODE_CONTROL, val) < 0)
> +	if (drm_dp_dpcd_write_byte(tunnel->aux, DP_DPTX_BW_ALLOCATION_MODE_CONTROL, val) < 0)
>  		goto out_err;
>  
>  	tunnel->bw_alloc_enabled = enable;
> @@ -1039,7 +1039,7 @@ static int clear_bw_req_state(struct drm_dp_aux *aux)
>  {
>  	u8 bw_req_mask = DP_BW_REQUEST_SUCCEEDED | DP_BW_REQUEST_FAILED;
>  
> -	if (drm_dp_dpcd_writeb(aux, DP_TUNNELING_STATUS, bw_req_mask) < 0)
> +	if (drm_dp_dpcd_write_byte(aux, DP_TUNNELING_STATUS, bw_req_mask) < 0)
>  		return -EIO;
>  
>  	return 0;
> @@ -1052,7 +1052,7 @@ static int bw_req_complete(struct drm_dp_aux *aux, bool *status_changed)
>  	u8 val;
>  	int err;
>  
> -	if (drm_dp_dpcd_readb(aux, DP_TUNNELING_STATUS, &val) < 0)
> +	if (drm_dp_dpcd_read_byte(aux, DP_TUNNELING_STATUS, &val) < 0)
>  		return -EIO;
>  
>  	*status_changed = val & status_change_mask;
> @@ -1095,7 +1095,7 @@ static int allocate_tunnel_bw(struct drm_dp_tunnel *tunnel, int bw)
>  	if (err)
>  		goto out;
>  
> -	if (drm_dp_dpcd_writeb(tunnel->aux, DP_REQUEST_BW, request_bw) < 0) {
> +	if (drm_dp_dpcd_write_byte(tunnel->aux, DP_REQUEST_BW, request_bw) < 0) {
>  		err = -EIO;
>  		goto out;
>  	}
> @@ -1196,13 +1196,13 @@ static int check_and_clear_status_change(struct drm_dp_tunnel *tunnel)
>  	u8 mask = DP_BW_ALLOCATION_CAPABILITY_CHANGED | DP_ESTIMATED_BW_CHANGED;
>  	u8 val;
>  
> -	if (drm_dp_dpcd_readb(tunnel->aux, DP_TUNNELING_STATUS, &val) < 0)
> +	if (drm_dp_dpcd_read_byte(tunnel->aux, DP_TUNNELING_STATUS, &val) < 0)
>  		goto out_err;
>  
>  	val &= mask;
>  
>  	if (val) {
> -		if (drm_dp_dpcd_writeb(tunnel->aux, DP_TUNNELING_STATUS, val) < 0)
> +		if (drm_dp_dpcd_write_byte(tunnel->aux, DP_TUNNELING_STATUS, val) < 0)
>  			goto out_err;
>  
>  		return 1;
> @@ -1215,7 +1215,7 @@ static int check_and_clear_status_change(struct drm_dp_tunnel *tunnel)
>  	 * Check for estimated BW changes explicitly to account for lost
>  	 * BW change notifications.
>  	 */
> -	if (drm_dp_dpcd_readb(tunnel->aux, DP_ESTIMATED_BW, &val) < 0)
> +	if (drm_dp_dpcd_read_byte(tunnel->aux, DP_ESTIMATED_BW, &val) < 0)
>  		goto out_err;
>  
>  	if (val * tunnel->bw_granularity != tunnel->estimated_bw)
> @@ -1300,7 +1300,7 @@ int drm_dp_tunnel_handle_irq(struct drm_dp_tunnel_mgr *mgr, struct drm_dp_aux *a
>  {
>  	u8 val;
>  
> -	if (drm_dp_dpcd_readb(aux, DP_TUNNELING_STATUS, &val) < 0)
> +	if (drm_dp_dpcd_read_byte(aux, DP_TUNNELING_STATUS, &val) < 0)
>  		return -EIO;
>  
>  	if (val & (DP_BW_REQUEST_SUCCEEDED | DP_BW_REQUEST_FAILED))
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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