linux-kernel - Re: [PATCH 5/5] drm/msm/mdp5: Use the interconnect API

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Message-ID: <73ae9093-1348-b092-80f2-09c0d3d90975@linaro.org>
Date:   Wed, 29 May 2019 16:08:16 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] drm/msm/mdp5: Use the interconnect API

On 5/8/19 23:42, Rob Clark wrote:
> From: Georgi Djakov <georgi.djakov@...aro.org>
> 

Let's put some text in the commit message:

The interconnect API provides an interface for consumer drivers to express
their bandwidth needs in the SoC. This data is aggregated and the on-chip
interconnect hardware is configured to the most appropriate power/performance
profile.

Use the API to configure the interconnects and request bandwidth between DDR and
the display hardware (MDP port(s) and rotator downscaler).


> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> index 97179bec8902..54d2b4c2b09f 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> @@ -16,6 +16,7 @@
>   * this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/interconnect.h>
>  #include <linux/of_irq.h>
>  
>  #include "msm_drv.h"
> @@ -1050,6 +1051,19 @@ static const struct component_ops mdp5_ops = {
>  
>  static int mdp5_dev_probe(struct platform_device *pdev)
>  {
> +	struct icc_path *path0 = of_icc_get(&pdev->dev, "port0");
> +	struct icc_path *path1 = of_icc_get(&pdev->dev, "port1");
> +	struct icc_path *path_rot = of_icc_get(&pdev->dev, "rotator");

It would be better change just the names to "mdp0-mem', "mdp1-mem",
"rotator-mem" for consistency and denote that the path target is the DDR memory.

> +
> +	if (IS_ERR(path0))
> +		return PTR_ERR(path0);
> +	icc_set_bw(path0, 0, MBps_to_icc(6400));
> +
> +	if (!IS_ERR(path1))
> +		icc_set_bw(path1, 0, MBps_to_icc(6400));
> +	if (!IS_ERR(path_rot))
> +		icc_set_bw(path_rot, 0, MBps_to_icc(6400));
> +
>  	DBG("");
>  	return component_add(&pdev->dev, &mdp5_ops);
>  }
> 

Thanks,
Georgi