linux-kernel - Re: [PATCH 2/3] clk: qcom: gcc-msm8998: Disable halt check of UFS clocks

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Message-ID: <273c0544-bf33-fe66-ac42-ad17ea3038d1@free.fr>
Date:   Fri, 30 Nov 2018 11:55:49 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH 2/3] clk: qcom: gcc-msm8998: Disable halt check of UFS
 clocks

On 30/11/2018 07:52, Bjorn Andersson wrote:

> Drop the halt check of the UFS symbol clocks, in accordance with other
> platforms. This makes clk_disable_unused() happy and makes it possible
> to turn the clocks on again without an error.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/clk/qcom/gcc-msm8998.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
> index d89f8e7c2a59..3d232d266d72 100644
> --- a/drivers/clk/qcom/gcc-msm8998.c
> +++ b/drivers/clk/qcom/gcc-msm8998.c
> @@ -2403,7 +2403,7 @@ static struct clk_branch gcc_ufs_phy_aux_clk = {
>  
>  static struct clk_branch gcc_ufs_rx_symbol_0_clk = {
>  	.halt_reg = 0x75014,
> -	.halt_check = BRANCH_HALT,
> +	.halt_check = BRANCH_HALT_SKIP,
>  	.clkr = {
>  		.enable_reg = 0x75014,
>  		.enable_mask = BIT(0),
> @@ -2416,7 +2416,7 @@ static struct clk_branch gcc_ufs_rx_symbol_0_clk = {
>  
>  static struct clk_branch gcc_ufs_rx_symbol_1_clk = {
>  	.halt_reg = 0x7605c,
> -	.halt_check = BRANCH_HALT,
> +	.halt_check = BRANCH_HALT_SKIP,
>  	.clkr = {
>  		.enable_reg = 0x7605c,
>  		.enable_mask = BIT(0),
> @@ -2429,7 +2429,7 @@ static struct clk_branch gcc_ufs_rx_symbol_1_clk = {
>  
>  static struct clk_branch gcc_ufs_tx_symbol_0_clk = {
>  	.halt_reg = 0x75010,
> -	.halt_check = BRANCH_HALT,
> +	.halt_check = BRANCH_HALT_SKIP,
>  	.clkr = {
>  		.enable_reg = 0x75010,
>  		.enable_mask = BIT(0),

FWIW, before applying your patch, the kernel printed the following
warnings at boot:

[    1.820756] gcc_ufs_rx_symbol_1_clk status stuck at 'on'
[    1.992977] gcc_ufs_rx_symbol_0_clk status stuck at 'on'
[    2.165113] gcc_gpu_bimc_gfx_clk status stuck at 'on'

https://lore.kernel.org/linux-clk/f4271471-b60a-f056-b453-1cfa593a0fc4@free.fr/

(NB: gcc_ufs_tx_symbol_0_clk not mentioned)

Your patch makes the two ufs_rx warnings go away.

Regards.