Re: [Freedreno] [PATCH 5/8] drm/msm/dsi: stop setting clock parents manually

[abhinavk@codeaurora.org]

On 2021-05-15 06:12, 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>
Once you have documented or pointed me to the documentation that 
assign-clock-parents
is now a mandatory property for the DSI node, this is a good cleanup, 
hence:

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

> ---
>  drivers/gpu/drm/msm/dsi/dsi.h         |  2 --
>  drivers/gpu/drm/msm/dsi/dsi_host.c    | 51 ---------------------------
>  drivers/gpu/drm/msm/dsi/dsi_manager.c |  5 ---
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 11 ------
>  4 files changed, 69 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h 
> b/drivers/gpu/drm/msm/dsi/dsi.h
> index 7abfeab08165..2041980548f0 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -169,8 +169,6 @@ void msm_dsi_phy_get_shared_timings(struct 
> msm_dsi_phy *phy,
>  			struct msm_dsi_phy_shared_timings *shared_timing);
>  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);
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c
> b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 8a10e4343281..1f444101e551 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -2223,57 +2223,6 @@ void msm_dsi_host_cmd_xfer_commit(struct
> mipi_dsi_host *host, u32 dma_base,
>  	wmb();
>  }
> 
> -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;
> -
> -	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 cd016576e8c5..12efc8c69046 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -78,7 +78,6 @@ static int dsi_mgr_setup_components(int id)
>  			return ret;
> 
>  		msm_dsi_phy_set_usecase(msm_dsi->phy, MSM_DSI_PHY_STANDALONE);
> -		ret = msm_dsi_host_set_src_pll(msm_dsi->host, msm_dsi->phy);
>  	} else if (!other_dsi) {
>  		ret = 0;
>  	} else {
> @@ -105,10 +104,6 @@ static int dsi_mgr_setup_components(int id)
>  					MSM_DSI_PHY_MASTER);
>  		msm_dsi_phy_set_usecase(clk_slave_dsi->phy,
>  					MSM_DSI_PHY_SLAVE);
> -		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;
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> index ff7f2ec42030..f2b5e0f63a16 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> @@ -835,17 +835,6 @@ void msm_dsi_phy_set_usecase(struct msm_dsi_phy 
> *phy,
>  		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)
> -{
> -	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) {