Re: [PATCH V5 5/6] scsi: ufs: qcom: Refactor ufs_qcom_cfg_timers function.
From: Nitin Rawat
Date: Thu Aug 31 2023 - 05:18:51 EST
On 8/28/2023 1:47 PM, Manivannan Sadhasivam wrote:
On Wed, Aug 23, 2023 at 09:14:12PM +0530, Nitin Rawat wrote:
This change configures SYS1CLK_1US_REG for pre scale up condition. Also
move ufs_qcom_cfg_timers from clk scaling post change ops to clk scaling
pre change ops to align with the hardware specification.
Same comment as previous patch. This looks like a bug fix to me.
Also, this patch should be splitted into 2. SYS1CLK_1US_REG and
ufs_qcom_cfg_timers change.
- Mani
In this patch we are trying to refactor ufs_qcom_cfg_timers function and
added extra argument to this function. Since it is just refactoring
code, IMO it's better to not split in to 2 patches. We will update the
commit message to explain more in detail
--Nitin
Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@xxxxxxxxxxx>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@xxxxxxxxxxx>
Signed-off-by: Nitin Rawat <quic_nitirawa@xxxxxxxxxxx>
---
drivers/ufs/host/ufs-qcom.c | 61 +++++++++++++++++++++++++------------
1 file changed, 42 insertions(+), 19 deletions(-)
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 491c0173603e..82cf3ac4193a 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -533,7 +533,8 @@ 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)
+ 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;
@@ -564,11 +565,16 @@ 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) {
@@ -577,8 +583,14 @@ 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 */
@@ -658,7 +670,7 @@ 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);
/*
@@ -719,7 +731,7 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
switch (status) {
case PRE_CHANGE:
if (ufs_qcom_cfg_timers(hba, UFS_PWM_G1, SLOWAUTO_MODE,
- 0, true)) {
+ 0, true, false)) {
dev_err(hba->dev, "%s: ufs_qcom_cfg_timers() failed\n",
__func__);
return -EINVAL;
@@ -968,7 +980,7 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
case POST_CHANGE:
if (ufs_qcom_cfg_timers(hba, dev_req_params->gear_rx,
dev_req_params->pwr_rx,
- dev_req_params->hs_rate, false)) {
+ dev_req_params->hs_rate, false, false)) {
dev_err(hba->dev, "%s: ufs_qcom_cfg_timers() failed\n",
__func__);
/*
@@ -1401,11 +1413,24 @@ static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+ struct ufs_pa_layer_attr *attr = &host->dev_req_params;
+ int err;
if (!ufs_qcom_cap_qunipro(host))
- return 0;
+ goto out;
+
+ 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__);
+ }
- return ufs_qcom_cfg_core_clk_ctrl(hba);
+ err = ufs_qcom_cfg_core_clk_ctrl(hba);
+out:
+ return err;
}
static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
@@ -1441,6 +1466,7 @@ 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;
@@ -1449,6 +1475,9 @@ static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba)
if (!ufs_qcom_cap_qunipro(host))
return 0;
+ if (attr)
+ ufs_qcom_cfg_timers(hba, attr->gear_rx, attr->pwr_rx,
+ attr->hs_rate, false, false);
list_for_each_entry(clki, head, list) {
if (!IS_ERR_OR_NULL(clki->clk) &&
@@ -1480,7 +1509,6 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
bool scale_up, enum ufs_notify_change_status status)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
- struct ufs_pa_layer_attr *dev_req_params = &host->dev_req_params;
int err = 0;
/* check the host controller state before sending hibern8 cmd */
@@ -1510,11 +1538,6 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
return err;
}
- ufs_qcom_cfg_timers(hba,
- dev_req_params->gear_rx,
- dev_req_params->pwr_rx,
- dev_req_params->hs_rate,
- false);
ufs_qcom_icc_update_bw(host);
ufshcd_uic_hibern8_exit(hba);
}
--
2.17.1