Re: [PATCH] drm/msm/dsi: use bulk clk API

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Fri 01 Oct 18:27 PDT 2021, Dmitry Baryshkov wrote:

> Use clk_bulk_* API instead of hand-coding them. Note, this drops support
> for legacy clk naming (e.g. "iface_clk" instead of just "iface"),
> however all in-kernel device trees were converted long long ago. The
> warning is present there since 2017.
> 

Nice!

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 59 ++++++------------------------
>  1 file changed, 12 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index e269df285136..3b81f40bba2e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -106,7 +106,8 @@ struct msm_dsi_host {
>  	phys_addr_t ctrl_size;
>  	struct regulator_bulk_data supplies[DSI_DEV_REGULATOR_MAX];
>  
> -	struct clk *bus_clks[DSI_BUS_CLK_MAX];
> +	int num_bus_clks;
> +	struct clk_bulk_data bus_clks[DSI_BUS_CLK_MAX];
>  
>  	struct clk *byte_clk;
>  	struct clk *esc_clk;
> @@ -374,15 +375,14 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
>  	int i, ret = 0;
>  
>  	/* get bus clocks */
> -	for (i = 0; i < cfg->num_bus_clks; i++) {
> -		msm_host->bus_clks[i] = msm_clk_get(pdev,
> -						cfg->bus_clk_names[i]);
> -		if (IS_ERR(msm_host->bus_clks[i])) {
> -			ret = PTR_ERR(msm_host->bus_clks[i]);
> -			pr_err("%s: Unable to get %s clock, ret = %d\n",
> -				__func__, cfg->bus_clk_names[i], ret);
> -			goto exit;
> -		}
> +	for (i = 0; i < cfg->num_bus_clks; i++)
> +		msm_host->bus_clks[i].id = cfg->bus_clk_names[i];
> +	msm_host->num_bus_clks = cfg->num_bus_clks;
> +
> +	ret = devm_clk_bulk_get(&pdev->dev, msm_host->num_bus_clks, msm_host->bus_clks);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Unable to get clocks, ret = %d\n", ret);
> +		goto exit;
>  	}
>  
>  	/* get link and source clocks */
> @@ -433,41 +433,6 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
>  	return ret;
>  }
>  
> -static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
> -{
> -	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
> -	int i, ret;
> -
> -	DBG("id=%d", msm_host->id);
> -
> -	for (i = 0; i < cfg->num_bus_clks; i++) {
> -		ret = clk_prepare_enable(msm_host->bus_clks[i]);
> -		if (ret) {
> -			pr_err("%s: failed to enable bus clock %d ret %d\n",
> -				__func__, i, ret);
> -			goto err;
> -		}
> -	}
> -
> -	return 0;
> -err:
> -	for (; i > 0; i--)
> -		clk_disable_unprepare(msm_host->bus_clks[i]);
> -
> -	return ret;
> -}
> -
> -static void dsi_bus_clk_disable(struct msm_dsi_host *msm_host)
> -{
> -	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
> -	int i;
> -
> -	DBG("");
> -
> -	for (i = cfg->num_bus_clks - 1; i >= 0; i--)
> -		clk_disable_unprepare(msm_host->bus_clks[i]);
> -}
> -
>  int msm_dsi_runtime_suspend(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
> @@ -478,7 +443,7 @@ int msm_dsi_runtime_suspend(struct device *dev)
>  	if (!msm_host->cfg_hnd)
>  		return 0;
>  
> -	dsi_bus_clk_disable(msm_host);
> +	clk_bulk_disable_unprepare(msm_host->num_bus_clks, msm_host->bus_clks);
>  
>  	return 0;
>  }
> @@ -493,7 +458,7 @@ int msm_dsi_runtime_resume(struct device *dev)
>  	if (!msm_host->cfg_hnd)
>  		return 0;
>  
> -	return dsi_bus_clk_enable(msm_host);
> +	return clk_bulk_prepare_enable(msm_host->num_bus_clks, msm_host->bus_clks);
>  }
>  
>  int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host)
> -- 
> 2.33.0
>