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Date: Mon, 4 Sep 2023 20:05:57 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
CC: <mani@...nel.org>, <agross@...nel.org>, <andersson@...nel.org>,
<konrad.dybcio@...aro.org>, <jejb@...ux.ibm.com>,
<martin.petersen@...cle.com>, <quic_cang@...cinc.com>,
<quic_nguyenb@...cinc.com>, <linux-scsi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
"Naveen Kumar Goud Arepalli" <quic_narepall@...cinc.com>
Subject: Re: [PATCH V6 2/6] scsi: ufs: qcom: Configure
PA_VS_CORE_CLK_40NS_CYCLES
On 9/1/2023 9:00 PM, Bjorn Andersson wrote:
> On Fri, Sep 01, 2023 at 05:13:32PM +0530, Nitin Rawat wrote:
>> Configure PA_VS_CORE_CLK_40NS_CYCLES with frequency of unipro core clk
>> for Qualcomm UFS controller V4.0 and onwards to align with the hardware
>> specification.
>>
>> Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
>> Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
>> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
>> ---
>> drivers/ufs/host/ufs-qcom.c | 47 ++++++++++++++++++++++++++++---------
>> drivers/ufs/host/ufs-qcom.h | 2 ++
>> 2 files changed, 38 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
>> index fe36003faaa8..018e391c276e 100644
>> --- a/drivers/ufs/host/ufs-qcom.c
>> +++ b/drivers/ufs/host/ufs-qcom.c
>> @@ -93,8 +93,9 @@ static const struct __ufs_qcom_bw_table {
>> static struct ufs_qcom_host *ufs_qcom_hosts[MAX_UFS_QCOM_HOSTS];
>>
>> 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);
>> +static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
>> + u32 clk_cycles,
>> + u32 clk_40ns_cycles);
>>
>> static struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd)
>> {
>> @@ -690,8 +691,8 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
>> * set unipro core clock cycles to 150 & clear clock
>> * divider
>> */
>> - err = ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba,
>> - 150);
>> + err = ufs_qcom_set_core_clk_ctrl(hba,
>> + 150, 6);
>
> There's no reason to maintain the line wrap here, and the new
> indentation looks wrong.
Sure..will remove it next patchset.
>
>>
>> /*
>> * Some UFS devices (and may be host) have issues if LCC is
>> @@ -1295,12 +1296,12 @@ static void ufs_qcom_exit(struct ufs_hba *hba)
>> phy_power_off(host->generic_phy);
>> phy_exit(host->generic_phy);
>> }
>> -
>> -static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
>> - u32 cycles_in_1us)
>> +static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
>> + u32 cycles_in_1us,
>
> Following my comment on this rename in the last commit, here you do
> change the prototype, so here you need the rename to clarify the intent,
> so make it here instead.
We will change the order of patch so that we need change the prototype
in 1 place.
-Nitin
>
>> + u32 cycles_in_40ns)
>> {
>> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
>> - u32 core_clk_ctrl_reg;
>> + u32 core_clk_ctrl_reg, reg;
>
> Please keep one variable declaration per line, in particular when using
> names like "core_clk_ctrl_reg" which looks much more like a type than a
> variable name...
>
> I would have preferred "reg" instead of core_clk_ctrl_reg" and you could
> have used that same variable for both sections.
>
>> int ret;
>>
>> ret = ufshcd_dme_get(hba,
>> @@ -1325,9 +1326,33 @@ static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
>> /* Clear CORE_CLK_DIV_EN */
>> core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
>>
>> - return ufshcd_dme_set(hba,
>> + err = ufshcd_dme_set(hba,
>
> I might be confused, but didn't you remove "err" in patch 1? Does this
> patch compile?
>
>> UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
>> core_clk_ctrl_reg);
>> + /*
>> + * UFS host controller V4.0.0 onwards needs to program
>> + * PA_VS_CORE_CLK_40NS_CYCLES attribute per programmed
>> + * frequency of unipro core clk of UFS host controller.
>> + */
>> + if (!err && (host->hw_ver.major >= 4)) {
>
> Rather than if (previous-block-didn't-fail), add an explicit return if
> err is unfavourable. That will make it more obvious that this section
> relates to version >= 4 and nothing else.
Sure..Will take care in next patchset
>
>
> That said, you now have one function:
>
> core_clk_ctrl(int a, int b)
> {
> do stuff based on a;
>
> if (version > 4)
> do stuff based on b;
> }
>
> It's pretty much one function for cycles_in_1us, with a separate
> function for cycles_in_40us bolted on at the end. How about just
> splitting it in two functions instead, and provide a small wrapper that
> calls one or both functions?
Sure...Will move cycles_in_40us to different function.
>
>> + if (cycles_in_40ns > PA_VS_CORE_CLK_40NS_CYCLES_MASK)
>> + return -EINVAL;
>> +
>> + err = ufshcd_dme_get(hba,
>> + UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
>> + ®);
>
> Leaving this line unwrapped seems to end up at 89 characters wide.
> Perfectly reasonable to do, in the name of readability.
>
Sure..Will address this in next patchset.
>> + if (err)
>> + return err;
>> +
>> + reg &= ~PA_VS_CORE_CLK_40NS_CYCLES_MASK;
>> + reg |= cycles_in_40ns;
>> +
>> + err = ufshcd_dme_set(hba,
>> + UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
>> + reg);
>
> Same as above.
Sure..Will address this in next patchset.
>
> Regards,
> Bjorn
Thanks,
Nitin
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