Re: [PATCH v7 2/3] ufs: host: Add ICE clock scaling during UFS clock changes

[Abhinaba Rakshit <abhinaba.rakshit@oss.qualcomm.com>]

On Mon, Mar 30, 2026 at 08:09:51PM +0530, Harshal Dev wrote:
> >  drivers/ufs/host/ufs-qcom.c | 19 ++++++++++++++++++-
> >  1 file changed, 18 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > index 8d119b3223cbdaa3297d2beabced0962a1a847d5..776444f46fe5f00f947e4b0b4dfe6d64e2ad2150 100644
> > --- a/drivers/ufs/host/ufs-qcom.c
> > +++ b/drivers/ufs/host/ufs-qcom.c
> > @@ -305,6 +305,15 @@ static int ufs_qcom_ice_prepare_key(struct blk_crypto_profile *profile,
> >  	return qcom_ice_prepare_key(host->ice, lt_key, lt_key_size, eph_key);
> >  }
> >  
> > +static int ufs_qcom_ice_scale_clk(struct ufs_qcom_host *host, unsigned long target_freq,
> > +				  bool round_ceil)
> > +{
> > +	if (host->hba->caps & UFSHCD_CAP_CRYPTO)
> > +		return qcom_ice_scale_clk(host->ice, target_freq, round_ceil);
> > +
> > +	return 0;
> > +}
> > +
> >  static const struct blk_crypto_ll_ops ufs_qcom_crypto_ops = {
> >  	.keyslot_program	= ufs_qcom_ice_keyslot_program,
> >  	.keyslot_evict		= ufs_qcom_ice_keyslot_evict,
> > @@ -339,6 +348,12 @@ static void ufs_qcom_config_ice_allocator(struct ufs_qcom_host *host)
> >  {
> >  }
> >  
> > +static int ufs_qcom_ice_scale_clk(struct ufs_qcom_host *host, unsigned long target_freq,
> > +				  bool round_ceil)
> > +{
> > +	return 0;
> > +}
> > +
> >  #endif
> >  
> >  static void ufs_qcom_disable_lane_clks(struct ufs_qcom_host *host)
> > @@ -1646,8 +1661,10 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba, bool scale_up,
> >  		else
> >  			err = ufs_qcom_clk_scale_down_post_change(hba, target_freq);
> >  
> > +		if (!err)
> > +			err = ufs_qcom_ice_scale_clk(host, target_freq, !scale_up);
> >  
> > -		if (err) {
> > +		if (err && err != -EOPNOTSUPP) {
> 
> Using -EOPNOTSUPP here works fine for now. But anyone touching any of the lower APIs called by
> ufs_qcom_clk_scale_up/down_post_change() needs to ensure they don't return -EOPNOTSUPP, otherwise
> hibernate exit will be skipped. So this carries a minor risk of breaking.
> 
> Since regardless of whether ufs_qcom_clk_scale_up/down_post_change() fails or ufs_qcom_ice_scale_clk()
> fails, we exit from hibernate and return from this function, I suggest you handle the error for ice_scale
> separately.
> 
> >  			ufshcd_uic_hibern8_exit(hba);
> >  			return err;
> >  		}
> > 
> 
> Add the call to ufs_qcom_ice_scale_clk() along with error handle here, and let the above error handle
> remain untouched.
> 
> 		err = ufs_qcom_ice_scale_clk(host, target_freq, !scale_up);
> 		if (err && err != -EOPNOTSUPP) {
> 			ufshcd_uic_hibern8_exit(hba);
>   			return err;
>   		}
> 

Right, I did think of this later.
Yes, this needs change.
Ack will update in the v8 patchset.
Thanks.

Abhinaba Rakshit