linux-kernel - Re: [PATCH 01/23] bus: mhi: Fix pm

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Date:   Wed, 9 Feb 2022 18:30:14 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     mhi@...ts.linux.dev
Cc:     quic_hemantk@...cinc.com, quic_bbhatt@...cinc.com,
        quic_jhugo@...cinc.com, vinod.koul@...aro.org,
        bjorn.andersson@...aro.org, dmitry.baryshkov@...aro.org,
        quic_vbadigan@...cinc.com, quic_cang@...cinc.com,
        quic_skananth@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, elder@...aro.org,
        Paul Davey <paul.davey@...iedtelesis.co.nz>,
        Hemant Kumar <hemantk@...eaurora.org>, stable@...r.kernel.org
Subject: Re: [PATCH 01/23] bus: mhi: Fix pm_state conversion to string

On Wed, Feb 09, 2022 at 03:15:39PM +0530, Manivannan Sadhasivam wrote:
> From: Paul Davey <paul.davey@...iedtelesis.co.nz>
> 
> On big endian architectures the mhi debugfs files which report pm state
> give "Invalid State" for all states.  This is caused by using
> find_last_bit which takes an unsigned long* while the state is passed in
> as an enum mhi_pm_state which will be of int size.
> 
> Fix by using __fls to pass the value of state instead of find_last_bit.
> 
> Fixes: a6e2e3522f29 ("bus: mhi: core: Add support for PM state transitions")
> Signed-off-by: Paul Davey <paul.davey@...iedtelesis.co.nz>
> Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
> Reviewed-by: Hemant Kumar <hemantk@...eaurora.org>
> Cc: stable@...r.kernel.org
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Please ignore this patch. It is missing the v2 prefix.

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/init.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 046f407dc5d6..0d588b60929e 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -79,10 +79,12 @@ static const char * const mhi_pm_state_str[] = {
>  
>  const char *to_mhi_pm_state_str(enum mhi_pm_state state)
>  {
> -	unsigned long pm_state = state;
> -	int index = find_last_bit(&pm_state, 32);
> +	int index;
>  
> -	if (index >= ARRAY_SIZE(mhi_pm_state_str))
> +	if (state)
> +		index = __fls(state);
> +
> +	if (!state || index >= ARRAY_SIZE(mhi_pm_state_str))
>  		return "Invalid State";
>  
>  	return mhi_pm_state_str[index];
> @@ -789,7 +791,6 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
>  		mhi_chan->offload_ch = ch_cfg->offload_channel;
>  		mhi_chan->db_cfg.reset_req = ch_cfg->doorbell_mode_switch;
>  		mhi_chan->pre_alloc = ch_cfg->auto_queue;
> -		mhi_chan->wake_capable = ch_cfg->wake_capable;
>  
>  		/*
>  		 * If MHI host allocates buffers, then the channel direction
> -- 
> 2.25.1
>