Re: [Freedreno] [PATCH 2/2] drm/msm/dsi: stop setting clock parents manually

[abhinavk@codeaurora.org]

On 2021-10-06 13:48, Dmitry Baryshkov wrote:
> There is no reason to set clock parents manually, use device tree to
> assign DSI/display clock parents to DSI PHY clocks. Dropping this 
> manual
> setup allows us to drop repeating code and to move registration of hw
> clock providers to generic place.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

I believe this was reviewed previously on

https://patchwork.freedesktop.org/patch/443470/

Hence,

Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>

> ---
>  drivers/gpu/drm/msm/dsi/dsi.h         |  2 -
>  drivers/gpu/drm/msm/dsi/dsi_host.c    | 53 ---------------------------
>  drivers/gpu/drm/msm/dsi/dsi_manager.c | 11 +-----
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 11 ------
>  4 files changed, 2 insertions(+), 75 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h 
> b/drivers/gpu/drm/msm/dsi/dsi.h
> index 7dfb6d198ca9..c03a8d09c764 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -173,8 +173,6 @@ int msm_dsi_phy_enable(struct msm_dsi_phy *phy,
>  void msm_dsi_phy_disable(struct msm_dsi_phy *phy);
>  void msm_dsi_phy_set_usecase(struct msm_dsi_phy *phy,
>  			     enum msm_dsi_phy_usecase uc);
> -int msm_dsi_phy_get_clk_provider(struct msm_dsi_phy *phy,
> -	struct clk **byte_clk_provider, struct clk **pixel_clk_provider);
>  void msm_dsi_phy_pll_save_state(struct msm_dsi_phy *phy);
>  int msm_dsi_phy_pll_restore_state(struct msm_dsi_phy *phy);
>  void msm_dsi_phy_snapshot(struct msm_disp_state *disp_state, struct
> msm_dsi_phy *phy);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c
> b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 1ffcd0577e99..9600b4fa27eb 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -2232,59 +2232,6 @@ void msm_dsi_host_set_phy_mode(struct
> mipi_dsi_host *host,
>  	msm_host->cphy_mode = src_phy->cphy_mode;
>  }
> 
> -int msm_dsi_host_set_src_pll(struct mipi_dsi_host *host,
> -	struct msm_dsi_phy *src_phy)
> -{
> -	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
> -	struct clk *byte_clk_provider, *pixel_clk_provider;
> -	int ret;
> -
> -	msm_host->cphy_mode = src_phy->cphy_mode;
> -
> -	ret = msm_dsi_phy_get_clk_provider(src_phy,
> -				&byte_clk_provider, &pixel_clk_provider);
> -	if (ret) {
> -		pr_info("%s: can't get provider from pll, don't set parent\n",
> -			__func__);
> -		return 0;
> -	}
> -
> -	ret = clk_set_parent(msm_host->byte_clk_src, byte_clk_provider);
> -	if (ret) {
> -		pr_err("%s: can't set parent to byte_clk_src. ret=%d\n",
> -			__func__, ret);
> -		goto exit;
> -	}
> -
> -	ret = clk_set_parent(msm_host->pixel_clk_src, pixel_clk_provider);
> -	if (ret) {
> -		pr_err("%s: can't set parent to pixel_clk_src. ret=%d\n",
> -			__func__, ret);
> -		goto exit;
> -	}
> -
> -	if (msm_host->dsi_clk_src) {
> -		ret = clk_set_parent(msm_host->dsi_clk_src, pixel_clk_provider);
> -		if (ret) {
> -			pr_err("%s: can't set parent to dsi_clk_src. ret=%d\n",
> -				__func__, ret);
> -			goto exit;
> -		}
> -	}
> -
> -	if (msm_host->esc_clk_src) {
> -		ret = clk_set_parent(msm_host->esc_clk_src, byte_clk_provider);
> -		if (ret) {
> -			pr_err("%s: can't set parent to esc_clk_src. ret=%d\n",
> -				__func__, ret);
> -			goto exit;
> -		}
> -	}
> -
> -exit:
> -	return ret;
> -}
> -
>  void msm_dsi_host_reset_phy(struct mipi_dsi_host *host)
>  {
>  	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> index 49a0a0841487..9342a822ad20 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -78,10 +78,7 @@ static int dsi_mgr_setup_components(int id)
> 
>  		msm_dsi_phy_set_usecase(msm_dsi->phy, MSM_DSI_PHY_STANDALONE);
>  		msm_dsi_host_set_phy_mode(msm_dsi->host, msm_dsi->phy);
> -		ret = msm_dsi_host_set_src_pll(msm_dsi->host, msm_dsi->phy);
> -	} else if (!other_dsi) {
> -		ret = 0;
> -	} else {
> +	} else if (other_dsi) {
>  		struct msm_dsi *master_link_dsi = IS_MASTER_DSI_LINK(id) ?
>  							msm_dsi : other_dsi;
>  		struct msm_dsi *slave_link_dsi = IS_MASTER_DSI_LINK(id) ?
> @@ -107,13 +104,9 @@ static int dsi_mgr_setup_components(int id)
>  					MSM_DSI_PHY_SLAVE);
>  		msm_dsi_host_set_phy_mode(msm_dsi->host, msm_dsi->phy);
>  		msm_dsi_host_set_phy_mode(other_dsi->host, other_dsi->phy);
> -		ret = msm_dsi_host_set_src_pll(msm_dsi->host, clk_master_dsi->phy);
> -		if (ret)
> -			return ret;
> -		ret = msm_dsi_host_set_src_pll(other_dsi->host, 
> clk_master_dsi->phy);
>  	}
> 
> -	return ret;
> +	return 0;
>  }
> 
>  static int enable_phy(struct msm_dsi *msm_dsi,
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> index 8c65ef6968ca..8ec331e751a2 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> @@ -890,17 +890,6 @@ bool msm_dsi_phy_set_continuous_clock(struct
> msm_dsi_phy *phy, bool enable)
>  	return phy->cfg->ops.set_continuous_clock(phy, enable);
>  }
> 
> -int msm_dsi_phy_get_clk_provider(struct msm_dsi_phy *phy,
> -	struct clk **byte_clk_provider, struct clk **pixel_clk_provider)
> -{
> -	if (byte_clk_provider)
> -		*byte_clk_provider = 
> phy->provided_clocks->hws[DSI_BYTE_PLL_CLK]->clk;
> -	if (pixel_clk_provider)
> -		*pixel_clk_provider = 
> phy->provided_clocks->hws[DSI_PIXEL_PLL_CLK]->clk;
> -
> -	return 0;
> -}
> -
>  void msm_dsi_phy_pll_save_state(struct msm_dsi_phy *phy)
>  {
>  	if (phy->cfg->ops.save_pll_state) {