mmc: sdhci-pxav3: Add base clock quirk

Enable the quirk SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN since
SD_CAPABILITIES_1[15:8](BASE_FREQ) can't get correct base clock value.
It returns a fixed pre-set value like 200 on some sdhci-pxav3 based
platforms like MMP3 while return 0 on the other sdhci-pxav3 based
platforms.  So we enable the quirk and get the base clock via function
get_max_clock. Also add get_max_clock.

Reported-by: Philip Rakity <prakity@marvell.com>
Reviewed-by: Philip Rakity <prakity@Marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-pxav3.c

@@ -163,10 +163,18 @@ static int pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
 	return 0;
 }
 
+static u32 pxav3_get_max_clock(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+	return clk_get_rate(pltfm_host->clk);
+}
+
 static struct sdhci_ops pxav3_sdhci_ops = {
 	.platform_reset_exit = pxav3_set_private_registers,
 	.set_uhs_signaling = pxav3_set_uhs_signaling,
 	.platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
+	.get_max_clock = pxav3_get_max_clock,
 };
 
 #ifdef CONFIG_OF
@@ -249,7 +257,8 @@ static int __devinit sdhci_pxav3_probe(struct platform_device *pdev)
 
 	host->quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
 		| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
-		| SDHCI_QUIRK_32BIT_ADMA_SIZE;
+		| SDHCI_QUIRK_32BIT_ADMA_SIZE
+		| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
 
 	/* enable 1/8V DDR capable */
 	host->mmc->caps |= MMC_CAP_1_8V_DDR;