usb: dwc2: gadget: config GAHBCFG from core parameter

The ahbcfg of dwc2_core_params can be used to overwrite
the default value of the GAHBCFG register. But the current
code don't use this parameter for dwc2 gadget, and always
set the burst length of GAHBCFG to INCR4. This patch sets
the the burst length of GAHBCFG to INCR4 only if ahbcfg is
-1, otherwise, overwrite the GAHBCFG with the ahbcfg value.

Change-Id: I78ed8f797a4b94b34f610789ee3bd61bcc8ed985
Signed-off-by: William Wu <william.wu@rock-chips.com>

Author: wuliangfeng

drivers/usb/dwc2/gadget.c

@@ -2563,15 +2563,16 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
 
 	dwc2_writel(intmsk, hsotg->regs + GINTMSK);
 
-	if (using_dma(hsotg))
-		dwc2_writel(GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN |
-			    (GAHBCFG_HBSTLEN_INCR4 << GAHBCFG_HBSTLEN_SHIFT),
+	if (using_dma(hsotg)) {
+		val = hsotg->core_params->ahbcfg & ~GAHBCFG_CTRL_MASK;
+		dwc2_writel(GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN | val,
 			    hsotg->regs + GAHBCFG);
-	else
+	} else {
 		dwc2_writel(((hsotg->dedicated_fifos) ?
 						(GAHBCFG_NP_TXF_EMP_LVL |
 						 GAHBCFG_P_TXF_EMP_LVL) : 0) |
 			    GAHBCFG_GLBL_INTR_EN, hsotg->regs + GAHBCFG);
+	}
 
 	/*
 	 * If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts