Mediatek UFS does not want to toggle write booster during clock scaling.
Permit host driver to disable wb toggling during clock scaling.
Introduce a flag UFSHCD_CAP_WB_WITH_CLK_SCALING to decouple WB and clock
scaling. UFSHCD_CAP_WB_WITH_CLK_SCALING is only valid when
UFSHCD_CAP_CLK_SCALING is set. Just like UFSHCD_CAP_HIBERN8_WITH_CLK_GATING
is valid only when UFSHCD_CAP_CLK_GATING set.
Set UFSHCD_CAP_WB_WITH_CLK_SCALING for qcom to compatible legacy design at
the same time.
Link: https://lore.kernel.org/r/20220804025422.18803-1-peter.wang@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
unsigned int wb_enable;
ssize_t res;
- if (!ufshcd_is_wb_allowed(hba) || ufshcd_is_clkscaling_supported(hba)) {
+ if (!ufshcd_is_wb_allowed(hba) || (ufshcd_is_clkscaling_supported(hba)
+ && ufshcd_enable_wb_if_scaling_up(hba))) {
/*
* If the platform supports UFSHCD_CAP_CLK_SCALING, turn WB
* on/off will be done while clock scaling up/down.
}
/* Enable Write Booster if we have scaled up else disable it */
- downgrade_write(&hba->clk_scaling_lock);
- is_writelock = false;
- ufshcd_wb_toggle(hba, scale_up);
+ if (ufshcd_enable_wb_if_scaling_up(hba)) {
+ downgrade_write(&hba->clk_scaling_lock);
+ is_writelock = false;
+ ufshcd_wb_toggle(hba, scale_up);
+ }
out_unprepare:
ufshcd_clock_scaling_unprepare(hba, is_writelock);
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
hba->caps |= UFSHCD_CAP_CLK_GATING | UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
- hba->caps |= UFSHCD_CAP_CLK_SCALING;
+ hba->caps |= UFSHCD_CAP_CLK_SCALING | UFSHCD_CAP_WB_WITH_CLK_SCALING;
hba->caps |= UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
hba->caps |= UFSHCD_CAP_WB_EN;
hba->caps |= UFSHCD_CAP_CRYPTO;
* notification if it is supported by the UFS device.
*/
UFSHCD_CAP_TEMP_NOTIF = 1 << 11,
+
+ /*
+ * Enable WriteBooster when scaling up the clock and disable
+ * WriteBooster when scaling the clock down.
+ */
+ UFSHCD_CAP_WB_WITH_CLK_SCALING = 1 << 12,
};
struct ufs_hba_variant_params {
return hba->caps & UFSHCD_CAP_WB_EN;
}
+static inline bool ufshcd_enable_wb_if_scaling_up(struct ufs_hba *hba)
+{
+ return hba->caps & UFSHCD_CAP_WB_WITH_CLK_SCALING;
+}
+
#define ufshcd_writel(hba, val, reg) \
writel((val), (hba)->mmio_base + (reg))
#define ufshcd_readl(hba, reg) \