FROMLIST: mmc: sdhci-msm: Set ICE clk to TURBO at sdhci ICE init

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 sdhci_msm_ice_init
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.

Link: https://lore.kernel.org/all/20260409-enable-ice-clock-scaling-v8-3-ca1129798606@oss.qualcomm.com/
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Abhinaba Rakshit <abhinaba.rakshit@oss.qualcomm.com>

Author: arakshit011

drivers/mmc/host/sdhci-msm.c

@@ -1889,6 +1889,8 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
 #ifdef CONFIG_MMC_CRYPTO
 
 static const struct blk_crypto_ll_ops sdhci_msm_crypto_ops; /* forward decl */
+static int sdhci_msm_ice_scale_clk(struct sdhci_msm_host *msm_host, unsigned long target_freq,
+				   bool round_ceil); /* forward decl */
 
 static int sdhci_msm_ice_init(struct sdhci_msm_host *msm_host,
 			      struct cqhci_host *cq_host)
@@ -1948,6 +1950,11 @@ static int sdhci_msm_ice_init(struct sdhci_msm_host *msm_host,
 
 	mmc->caps2 |= MMC_CAP2_CRYPTO;
 	mmc->caps2 |= MMC_CAP2_CRYPTO_NO_REPROG;
+
+	err = sdhci_msm_ice_scale_clk(msm_host, INT_MAX, false);
+	if (err && err != -EOPNOTSUPP)
+		dev_warn(dev, "Unable to boost ICE clock to TURBO\n");
+
 	return 0;
 }
 
@@ -1973,6 +1980,16 @@ static int sdhci_msm_ice_suspend(struct sdhci_msm_host *msm_host)
 	return 0;
 }
 
+static int sdhci_msm_ice_scale_clk(struct sdhci_msm_host *msm_host,
+				   unsigned long target_freq,
+				   bool round_ceil)
+{
+	if (msm_host->mmc->caps2 & MMC_CAP2_CRYPTO)
+		return qcom_ice_scale_clk(msm_host->ice, target_freq, round_ceil);
+
+	return 0;
+}
+
 static inline struct sdhci_msm_host *
 sdhci_msm_host_from_crypto_profile(struct blk_crypto_profile *profile)
 {
@@ -2076,6 +2093,13 @@ sdhci_msm_ice_suspend(struct sdhci_msm_host *msm_host)
 {
 	return 0;
 }
+
+static inline int
+sdhci_msm_ice_scale_clk(struct sdhci_msm_host *msm_host, unsigned long target_freq,
+			bool round_ceil)
+{
+	return 0;
+}
 #endif /* !CONFIG_MMC_CRYPTO */
 
 /*****************************************************************************\