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Date: Mon, 7 Aug 2023 23:14:09 -0700
From: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To: Nitin Rawat <quic_nitirawa@...cinc.com>, <mani@...nel.org>,
<quic_cang@...cinc.com>, <quic_asutoshd@...cinc.com>,
<avri.altman@....com>, <martin.petersen@...cle.com>,
<beanhuo@...ron.com>
CC: <bvanassche@....org>, <linux-scsi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <agross@...nel.org>,
<andersson@...nel.org>, <konrad.dybcio@...aro.org>,
<jejb@...ux.ibm.com>, <linux-arm-msm@...r.kernel.org>,
<quic_ziqichen@...cinc.com>,
"Naveen Kumar Goud Arepalli" <quic_narepall@...cinc.com>
Subject: Re: [PATCH V1] scsi: ufs: qcom: Align programming sequence as per HW
spec
On 8/7/2023 8:50 AM, Nitin Rawat wrote:
> Align clock configuration as per Qualcomm UFS controller
> hardware specification.
>
> This change updates UFS_SYS1CLK_1US, CORE_CLK_1US_CYCLES,
> PA_VS_CORE_CLK_40NS_CYCLES timer configuration for Qunipro
> and UTP to align with Qualcomm UFS HW 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 | 262 +++++++++++++++++++++++++++---------
> drivers/ufs/host/ufs-qcom.h | 20 ++-
> 2 files changed, 215 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index e7164ce7336b..836894c112c1 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -91,10 +91,7 @@ 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 struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd)
> {
> @@ -531,8 +528,9 @@ static int ufs_qcom_hce_enable_notify(struct ufs_hba *hba,
> /*
> * Return: zero for success and non-zero in case of a failure.
> */
> -static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> - u32 hs, u32 rate, bool update_link_startup_timer)
> +static int __ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> + u32 hs, u32 rate, bool link_startup,
> + bool is_pre_scale_up)
> {
> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> struct ufs_clk_info *clki;
> @@ -563,11 +561,16 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> /*
> * The Qunipro controller does not use following registers:
> * SYS1CLK_1US_REG, TX_SYMBOL_CLK_1US_REG, CLK_NS_REG &
> - * UFS_REG_PA_LINK_STARTUP_TIMER
> - * But UTP controller uses SYS1CLK_1US_REG register for Interrupt
> - * Aggregation logic.
> - */
> - if (ufs_qcom_cap_qunipro(host) && !ufshcd_is_intr_aggr_allowed(hba))
> + * UFS_REG_PA_LINK_STARTUP_TIMER.
> + * However UTP controller uses SYS1CLK_1US_REG register for Interrupt
> + * Aggregation logic and Auto hibern8 logic.
> + * It is mandatory to write SYS1CLK_1US_REG register on UFS host
> + * controller V4.0.0 onwards.
> + */
> + if (ufs_qcom_cap_qunipro(host) &&
> + !(ufshcd_is_intr_aggr_allowed(hba) ||
> + ufshcd_is_auto_hibern8_supported(hba) ||
> + host->hw_ver.major >= 4))
> return 0;
>
> if (gear == 0) {
> @@ -576,8 +579,14 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> }
>
> list_for_each_entry(clki, &hba->clk_list_head, list) {
> - if (!strcmp(clki->name, "core_clk"))
> - core_clk_rate = clk_get_rate(clki->clk);
> + if (!strcmp(clki->name, "core_clk")) {
> + if (is_pre_scale_up)
> + core_clk_rate = clki->max_freq;
> + else
> + core_clk_rate = clk_get_rate(clki->clk);
> + break;
> + }
> +
> }
>
> /* If frequency is smaller than 1MHz, set to 1MHz */
> @@ -657,7 +666,7 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> mb();
> }
>
> - if (update_link_startup_timer && host->hw_ver.major != 0x5) {
> + if (link_startup && host->hw_ver.major != 0x5) {
> ufshcd_writel(hba, ((core_clk_rate / MSEC_PER_SEC) * 100),
> REG_UFS_CFG0);
> /*
> @@ -670,6 +679,114 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> return 0;
> }
>
> +static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
> + u32 hs, u32 rate, bool link_startup)
Hi Nitin,
How about adding scale_up param to this function ufs_qcom_cfg_timers()
as below:
static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
u32 hs, u32 rate, bool link_startup,
bool scale_up)
Then replace all references to __ufs_qcom_cfg_timers() with
ufs_qcom_cfg_timers()?
It is hard to follow these two almost identical functions with 2 flags
invoked from different places, so try to get rid of one.
> +{
> + return __ufs_qcom_cfg_timers(hba, gear, hs, rate,
> + link_startup, false);
> +}
> +
> +static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
> + u32 clk_1us_cycles,
> + u32 clk_40ns_cycles,
> + bool scale_up)
> +{
> + struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> + u32 mask = MAX_CORE_CLK_1US_CYCLES_MASK;
> + u32 reg, clk_cycles;
Remove the clk_cycles variable and re-use the variable reg?
> + u32 offset = 0;
> + int err;
> +
> + /* Bit mask and offset changed on UFS host controller V4.0.0 onwards */
> + if (host->hw_ver.major >= 4) {
> + mask = MAX_CORE_CLK_1US_CYCLES_MASK_V4;
> + offset = MAX_CORE_CLK_1US_CYCLES_OFFSET_V4;
> + }
> +
> + if (clk_1us_cycles > mask)
> + return -EINVAL;
> +
> + err = ufshcd_dme_get(hba, UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL), ®);
> + if (err)
> + return err;
> +
> + reg &= ~(mask << offset);
> + reg |= clk_1us_cycles << offset;
> +
> + if (scale_up)
> + reg |= CORE_CLK_DIV_EN_BIT;
> + else
> + reg &= ~CORE_CLK_DIV_EN_BIT;
> +
> + err = ufshcd_dme_set(hba, UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL), reg);
> + if (err)
> + return err;
> +
> + /*
> + * 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 (host->hw_ver.major >= 4) {
> + if (clk_40ns_cycles > PA_VS_CORE_CLK_40NS_CYCLES_MASK)
> + return -EINVAL;
> +
> + err = ufshcd_dme_get(hba,
Nitpicking..You can probably fit all 3 params on 1 line once you replace
clk_cycles with reg.
> + UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
> + &clk_cycles);
> + if (err)
> + return err;
> +
> + clk_cycles &= ~PA_VS_CORE_CLK_40NS_CYCLES_MASK;
> + clk_cycles |= clk_40ns_cycles;
> +
> + err = ufshcd_dme_set(hba,
Same comment as above.
> + UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES),
> + clk_cycles);
> + }
> +
> + return err;
> +}
> +
> +static int ufs_qcom_cfg_core_clk_ctrl(struct ufs_hba *hba)
> +{
> + struct list_head *head = &hba->clk_list_head;
> + struct ufs_clk_info *clki;
> + u32 max_freq = 0;
> + int err;
> +
> + list_for_each_entry(clki, head, list) {
> + if (!IS_ERR_OR_NULL(clki->clk) &&
> + (!strcmp(clki->name, "core_clk_unipro"))) {
> + max_freq = clki->max_freq;
> + break;
> + }
> + }
> +
> + switch (max_freq) {
> + case MHZ_403:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 403, 16, true);
> + break;
> + case MHZ_300:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 300, 12, true);
> + break;
> + case MHZ_201_5:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 202, 8, true);
> + break;
> + case MHZ_150:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 150, 6, true);
> + break;
> + case MHZ_100:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 100, 4, true);
> + break;
> + default:
> + dev_err(hba->dev, "unipro max_freq=%u entry missing\n", max_freq);
> + err = -EINVAL;
> + break;
> + }
> +
> + return err;
> +}
> static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
> enum ufs_notify_change_status status)
> {
> @@ -685,13 +802,15 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
> return -EINVAL;
> }
>
> - if (ufs_qcom_cap_qunipro(host))
> - /*
> - * set unipro core clock cycles to 150 & clear clock
> - * divider
> - */
> - err = ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba,
> - 150);
> + if (ufs_qcom_cap_qunipro(host)) {
> + err = ufs_qcom_cfg_core_clk_ctrl(hba);
> + if (err) {
> + dev_err(hba->dev,
> + "%s cfg core clk ctrl failed\n",
> + __func__);
> + return err;
> + }
> + }
>
> /*
> * Some UFS devices (and may be host) have issues if LCC is
> @@ -1296,69 +1415,52 @@ static void ufs_qcom_exit(struct ufs_hba *hba)
> phy_exit(host->generic_phy);
> }
>
> -static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba,
> - u32 clk_cycles)
> +static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba)
> {
> - int err;
> - u32 core_clk_ctrl_reg;
> -
> - if (clk_cycles > DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK)
> - return -EINVAL;
> -
> - err = ufshcd_dme_get(hba,
> - UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
> - &core_clk_ctrl_reg);
> - if (err)
> - return err;
> -
> - core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK;
> - core_clk_ctrl_reg |= clk_cycles;
> -
> - /* Clear CORE_CLK_DIV_EN */
> - core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
> + struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> + struct ufs_pa_layer_attr *attr = &host->dev_req_params;
> + int err = 0;
>
> - return ufshcd_dme_set(hba,
> - UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
> - core_clk_ctrl_reg);
> -}
> + if (!ufs_qcom_cap_qunipro(host))
> + goto out;
>
> -static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba)
> -{
> - /* nothing to do as of now */
> - return 0;
> + if (attr) {
> + err = __ufs_qcom_cfg_timers(hba, attr->gear_rx,
> + attr->pwr_rx, attr->hs_rate,
> + false, true);
> + if (err)
> + dev_err(hba->dev, "%s ufs cfg timer failed\n",
> + __func__);
> + }
> + err = ufs_qcom_cfg_core_clk_ctrl(hba);
> +out:
> + return err;
> }
>
> static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
> {
> - struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> -
> - if (!ufs_qcom_cap_qunipro(host))
> - return 0;
> -
> - /* set unipro core clock cycles to 150 and clear clock divider */
> - return ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba, 150);
> + return 0;
> }
>
> static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
> {
> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> int err;
> - u32 core_clk_ctrl_reg;
> + u32 reg;
>
> if (!ufs_qcom_cap_qunipro(host))
> return 0;
>
> - err = ufshcd_dme_get(hba,
> - UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
> - &core_clk_ctrl_reg);
> + err = ufshcd_dme_get(hba, UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL), ®);
> + if (err)
> + return err;
>
> /* make sure CORE_CLK_DIV_EN is cleared */
> - if (!err &&
> - (core_clk_ctrl_reg & DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT)) {
> - core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
> + if (reg & CORE_CLK_DIV_EN_BIT) {
> + reg &= ~CORE_CLK_DIV_EN_BIT;
> err = ufshcd_dme_set(hba,
> UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
> - core_clk_ctrl_reg);
> + reg);
> }
>
> return err;
> @@ -1367,12 +1469,44 @@ static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
> static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba)
> {
> struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> + struct ufs_pa_layer_attr *attr = &host->dev_req_params;
> + struct list_head *head = &hba->clk_list_head;
> + struct ufs_clk_info *clki;
> + u32 curr_freq = 0;
> + int err;
>
> if (!ufs_qcom_cap_qunipro(host))
> return 0;
>
> - /* set unipro core clock cycles to 75 and clear clock divider */
> - return ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba, 75);
> + if (attr)
> + ufs_qcom_cfg_timers(hba, attr->gear_rx, attr->pwr_rx,
> + attr->hs_rate, false);
> +
> + list_for_each_entry(clki, head, list) {
> + if (!IS_ERR_OR_NULL(clki->clk) &&
> + (!strcmp(clki->name, "core_clk_unipro"))) {
> + curr_freq = clk_get_rate(clki->clk);
> + break;
> + }
> + }
> +
> + switch (curr_freq) {
> + case MHZ_37_5:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 38, 2, false);
> + break;
> + case MHZ_75:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 75, 3, false);
> + break;
> + case MHZ_100:
> + err = ufs_qcom_set_core_clk_ctrl(hba, 100, 4, false);
> + break;
> + default:
> + err = -EINVAL;
> + dev_err(hba->dev, "unipro curr_freq=%u entry missing\n", curr_freq);
> + break;
> + }
> +
> + return err;
> }
>
> static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
> diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
> index d6f8e74bd538..da7b5ee7c1cf 100644
> --- a/drivers/ufs/host/ufs-qcom.h
> +++ b/drivers/ufs/host/ufs-qcom.h
> @@ -79,6 +79,17 @@ enum {
> UFS_MEM_CQIS_VS = 0x8,
> };
>
> +
> +/* QCOM UFS host controller core clk frequencies */
> +#define MHZ_37_5 37500000
> +#define MHZ_50 50000000
> +#define MHZ_75 75000000
> +#define MHZ_100 100000000
> +#define MHZ_150 150000000
> +#define MHZ_300 300000000
> +#define MHZ_201_5 201500000
> +#define MHZ_403 403000000
> +
> #define UFS_CNTLR_2_x_x_VEN_REGS_OFFSET(x) (0x000 + x)
> #define UFS_CNTLR_3_x_x_VEN_REGS_OFFSET(x) (0x400 + x)
>
> @@ -129,9 +140,12 @@ enum {
> #define PA_VS_CONFIG_REG1 0x9000
> #define DME_VS_CORE_CLK_CTRL 0xD002
> /* bit and mask definitions for DME_VS_CORE_CLK_CTRL attribute */
> -#define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT BIT(8)
> -#define DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK 0xFF
> -
> +#define MAX_CORE_CLK_1US_CYCLES_MASK_V4 0xFFF
> +#define MAX_CORE_CLK_1US_CYCLES_OFFSET_V4 0x10
> +#define MAX_CORE_CLK_1US_CYCLES_MASK 0xFF
> +#define CORE_CLK_DIV_EN_BIT BIT(8)
> +#define PA_VS_CORE_CLK_40NS_CYCLES 0x9007
> +#define PA_VS_CORE_CLK_40NS_CYCLES_MASK 0x3F
Remove the 1 extra tab in between the macro names and their values?
> static inline void
> ufs_qcom_get_controller_revision(struct ufs_hba *hba,
> u8 *major, u16 *minor, u16 *step)
> --
> 2.17.1
>
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