scsi: ufs: qcom: Provide default cycles_in_1us value

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: b4e13e1 ("scsi: ufs: qcom: Add multiple frequency support for MAX_CORE_CLK_1US_CYCLES")
Cc: Nitin Rawat <[email protected]>
Cc: [email protected] # 6.7.x
Reviewed-by: Konrad Dybcio <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

Author: lumag

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));