scsi: ufs: qcom: Add a readl() to make sure ref_clk gets enabled

commit 8eecddfca30e1651dc1c74531ed5eef21dcce7e3 upstream.

In ufs_qcom_dev_ref_clk_ctrl(), it was noted that the ref_clk needs to be
stable for at least 1us. Even though there is wmb() to make sure the write
gets "completed", there is no guarantee that the write actually reached the
UFS device. There is a good chance that the write could be stored in a
Write Buffer (WB). In that case, even though the CPU waits for 1us, the
ref_clk might not be stable for that period.

So lets do a readl() to make sure that the previous write has reached the
UFS device before udelay().

Also, the wmb() after writel_relaxed() is not really needed. Both writel()
and readl() are ordered on all architectures and the CPU won't speculate
instructions after readl() due to the in-built control dependency with read
value on weakly ordered architectures. So it can be safely removed.

Link: https://lore.kernel.org/r/20220504084212.11605-4-manivannan.sadhasivam@linaro.org
Fixes: f06fcc7155dc ("scsi: ufs-qcom: add QUniPro hardware support and power optimizations")
Cc: stable@vger.kernel.org
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 2f3183b8e93678fab201b876a098bc15434f882e..35a1e6ee8de442412907c413de8961c13b9d12d1 100644 (file)
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -682,8 +682,11 @@ static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable)
 
                writel_relaxed(temp, host->dev_ref_clk_ctrl_mmio);
 
-               /* ensure that ref_clk is enabled/disabled before we return */
-               wmb();
+               /*
+                * Make sure the write to ref_clk reaches the destination and
+                * not stored in a Write Buffer (WB).
+                */
+               readl(host->dev_ref_clk_ctrl_mmio);
 
                /*
                 * If we call hibern8 exit after this, we need to make sure that