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Date: Tue, 11 Feb 2020 11:13:05 +0800
From: Can Guo <cang@...eaurora.org>
To: hongwus@...eaurora.org
Cc: asutoshd@...eaurora.org, nguyenb@...eaurora.org,
rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/7] scsi: ufs-qcom: Adjust bus bandwidth voting and
unvoting
On 2020-02-11 11:09, hongwus@...eaurora.org wrote:
> Hi Can,
>
>
> On 2020-02-11 10:37, Can Guo wrote:
>> The bus bandwidth voting is required to be done before the bus clocks
>> are enabled, and the unvoting is required to be done only after the
>> bus
>> clocks are disabled.
>>
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
>> ---
>> drivers/scsi/ufs/ufs-qcom.c | 78
>> ++++++++++++++++++++++++++++++---------------
>> 1 file changed, 53 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index c69c29a1c..ded08fb 100644
>> --- a/drivers/scsi/ufs/ufs-qcom.c
>> +++ b/drivers/scsi/ufs/ufs-qcom.c
>> @@ -38,7 +38,6 @@ enum {
>>
>> static struct ufs_qcom_host *ufs_qcom_hosts[MAX_UFS_QCOM_HOSTS];
>>
>> -static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int
>> vote);
>> static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host
>> *host);
>> static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba
>> *hba,
>> u32 clk_cycles);
>> @@ -674,7 +673,7 @@ static void ufs_qcom_get_speed_mode(struct
>> ufs_pa_layer_attr *p, char *result)
>> }
>> }
>>
>> -static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int
>> vote)
>> +static int __ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int
>> vote)
>> {
>> int err = 0;
>>
>> @@ -705,7 +704,7 @@ static int ufs_qcom_update_bus_bw_vote(struct
>> ufs_qcom_host *host)
>>
>> vote = ufs_qcom_get_bus_vote(host, mode);
>> if (vote >= 0)
>> - err = ufs_qcom_set_bus_vote(host, vote);
>> + err = __ufs_qcom_set_bus_vote(host, vote);
>> else
>> err = vote;
>>
>> @@ -716,6 +715,35 @@ static int ufs_qcom_update_bus_bw_vote(struct
>> ufs_qcom_host *host)
>> return err;
>> }
>>
>> +static int ufs_qcom_set_bus_vote(struct ufs_hba *hba, bool on)
>> +{
>> + struct ufs_qcom_host *host = ufshcd_get_variant(hba);
>> + int vote, err;
>> +
>> + /*
>> + * In case ufs_qcom_init() is not yet done, simply ignore.
>> + * This ufs_qcom_set_bus_vote() shall be called from
>> + * ufs_qcom_init() after init is done.
>> + */
>> + if (!host)
>> + return 0;
>> +
>> + if (on) {
>> + vote = host->bus_vote.saved_vote;
>> + if (vote == host->bus_vote.min_bw_vote)
>> + ufs_qcom_update_bus_bw_vote(host);
>> + } else {
>> + vote = host->bus_vote.min_bw_vote;
>> + }
>> +
>> + err = __ufs_qcom_set_bus_vote(host, vote);
>> + if (err)
>> + dev_err(hba->dev, "%s: set bus vote failed %d\n",
>> + __func__, err);
>> +
>> + return err;
>> +}
>> +
>> static ssize_t
>> show_ufs_to_mem_max_bus_bw(struct device *dev, struct
>> device_attribute *attr,
>> char *buf)
>> @@ -792,7 +820,7 @@ static int ufs_qcom_update_bus_bw_vote(struct
>> ufs_qcom_host *host)
>> return 0;
>> }
>>
>> -static int ufs_qcom_set_bus_vote(struct ufs_qcom_host *host, int
>> vote)
>> +static int ufs_qcom_set_bus_vote(struct ufs_hba *host, bool on)
>> {
>> return 0;
>> }
>> @@ -1030,8 +1058,7 @@ static int ufs_qcom_setup_clocks(struct ufs_hba
>> *hba, bool on,
>> enum ufs_notify_change_status status)
>> {
>> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
>> - int err;
>> - int vote = 0;
>> + int err = 0;
>>
>> /*
>> * In case ufs_qcom_init() is not yet done, simply ignore.
>> @@ -1041,28 +1068,28 @@ static int ufs_qcom_setup_clocks(struct
>> ufs_hba *hba, bool on,
>> if (!host)
>> return 0;
>>
>> - if (on && (status == POST_CHANGE)) {
>> - /* enable the device ref clock for HS mode*/
>> - if (ufshcd_is_hs_mode(&hba->pwr_info))
>> - ufs_qcom_dev_ref_clk_ctrl(host, true);
>> - vote = host->bus_vote.saved_vote;
>> - if (vote == host->bus_vote.min_bw_vote)
>> - ufs_qcom_update_bus_bw_vote(host);
>> -
>> - } else if (!on && (status == PRE_CHANGE)) {
>> - if (!ufs_qcom_is_link_active(hba)) {
>> - /* disable device ref_clk */
>> - ufs_qcom_dev_ref_clk_ctrl(host, false);
>> + switch(status) {
>> + case PRE_CHANGE:
>> + if (on) {
>> + err = ufs_qcom_set_bus_vote(hba, true);
>> + } else {
>> + if (!ufs_qcom_is_link_active(hba)) {
>> + /* disable device ref_clk */
>> + ufs_qcom_dev_ref_clk_ctrl(host, false);
>> + }
>> }
>> -
>> - vote = host->bus_vote.min_bw_vote;
>> + break;
>> + case POST_CHANGE:
>> + if (on) {
>> + /* enable the device ref clock for HS mode*/
>> + if (ufshcd_is_hs_mode(&hba->pwr_info))
>> + ufs_qcom_dev_ref_clk_ctrl(host, true);
>> + } else {
>> + err = ufs_qcom_set_bus_vote(hba, false);
>> + }
>> + break;
>> }
>>
>> - err = ufs_qcom_set_bus_vote(host, vote);
>> - if (err)
>> - dev_err(hba->dev, "%s: set bus vote failed %d\n",
>> - __func__, err);
>> -
>> return err;
>> }
>>
>> @@ -1238,6 +1265,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>> ufs_qcom_set_caps(hba);
>> ufs_qcom_advertise_quirks(hba);
>>
>> + ufs_qcom_set_bus_vote(hba, true);
>> ufs_qcom_setup_clocks(hba, true, POST_CHANGE);
>>
>> if (hba->dev->id < MAX_UFS_QCOM_HOSTS)
>
>
> Please add space after switch.
> + switch(status) {
> + case PRE_CHANGE
>
>
> Reviewed-by: Hongwu Su <hongwus@...eaurora.org>
Thanks.
Can Guo.
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