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[v3,1/5] scsi: ufs: qcom: provide default cycles_in_1us value

Message ID 20240218-msm8996-fix-ufs-v3-1-40aab49899a3@linaro.org
State New
Headers show
Series scsi: ufs: qcom: fix UFSDHCD support on MSM8996 platform | expand

Commit Message

Dmitry Baryshkov Feb. 18, 2024, 1:56 p.m. UTC 
The MSM8996 DT doesn't provide frequency limits for the core_clk_unipro
clock, which results in miscalculation of the cycles_in_1us value.
Provide the backwards-compatible default to support existing MSM8996
DT files.

Fixes: b4e13e1ae95e ("scsi: ufs: qcom: Add multiple frequency support for MAX_CORE_CLK_1US_CYCLES")
Cc: Nitin Rawat <quic_nitirawa@quicinc.com>
Cc: <stable@vger.kernel.org> # 6.7.x
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/ufs/host/ufs-qcom.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 0aeaee1c564c..79f8cb377710 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1210,8 +1210,10 @@  static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, bool is_scale_up)
 
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk) &&
-			!strcmp(clki->name, "core_clk_unipro")) {
-			if (is_scale_up)
+		    !strcmp(clki->name, "core_clk_unipro")) {
+			if (!clki->max_freq)
+				cycles_in_1us = 150; /* default for backwards compatibility */
+			else if (is_scale_up)
 				cycles_in_1us = ceil(clki->max_freq, (1000 * 1000));
 			else
 				cycles_in_1us = ceil(clk_get_rate(clki->clk), (1000 * 1000));