[PATCH v6 4/4] soc: qcom: ice: Set ICE clk to TURBO on probe

[Abhinaba Rakshit]

MMC controller lacks a clock scaling mechanism, unlike the UFS
controller. By default, the MMC controller is set to TURBO mode
during probe, but the ICE clock remains at XO frequency,
leading to read/write performance degradation on eMMC.

To address this, set the ICE clock to TURBO during probe to
align it with the controller clock. This ensures consistent
performance and avoids mismatches between the controller
and ICE clock frequencies.

For platforms where ICE is represented as a separate device,
use the OPP framework to vote for TURBO mode, maintaining
proper voltage and power domain constraints.

Signed-off-by: Abhinaba Rakshit <abhinaba.rakshit@xxxxxxxxxxxxxxxx>
---
 drivers/soc/qcom/ice.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/soc/qcom/ice.c b/drivers/soc/qcom/ice.c
index 1372dc4a4a4d0df982ea3a174df8779a37ce07c6..a60a793f9c230e08ebd7cae89a828980e762db27 100644
--- a/drivers/soc/qcom/ice.c
+++ b/drivers/soc/qcom/ice.c
@@ -665,6 +665,13 @@ static struct qcom_ice *qcom_ice_create(struct device *dev,
 			dev_info(dev, "ICE OPP table is not registered\n");
 	}
 
+	if (engine->has_opp) {
+		/* Vote for maximum clock rate for maximum performance */
+		err = dev_pm_opp_set_rate(dev, INT_MAX);
+		if (err)
+			dev_warn(dev, "Failed boosting the ICE clk to TURBO\n");
+	}
+
 	engine->core_clk_freq = clk_get_rate(engine->core_clk);
 	if (!qcom_ice_check_supported(engine))
 		return ERR_PTR(-EOPNOTSUPP);

-- 
2.34.1