linux-kernel - [PATCH] usb: dwc2: Set AHB burst size to INCR

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Date:   Wed, 19 Apr 2017 15:13:49 +0400
From:   Razmik Karapetyan <Razmik.Karapetyan@...opsys.com>
To:     John Youn <John.Youn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Razmik Karapetyan <Razmik.Karapetyan@...opsys.com>
Subject: [PATCH] usb: dwc2: Set AHB burst size to INCR

Changed AHB burst size from INCR4 to INCR by default.
With this value driver show excellent DMA performance.

Signed-off-by: Razmik Karapetyan <razmik@...opsys.com>
---
 drivers/usb/dwc2/gadget.c | 2 +-
 drivers/usb/dwc2/params.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 98a4a79..ebf3a63 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3315,7 +3315,7 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
 
 	if (using_dma(hsotg)) {
 		dwc2_writel(GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN |
-			    (GAHBCFG_HBSTLEN_INCR4 << GAHBCFG_HBSTLEN_SHIFT),
+			    hsotg->params.ahbcfg,
 			    hsotg->regs + GAHBCFG);
 
 		/* Set DDMA mode support in the core if needed */
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index ba52ef9..6420a17 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -266,7 +266,7 @@ static void dwc2_set_default_params(struct dwc2_hsotg *hsotg)
 	p->hibernation = false;
 	p->max_packet_count = hw->max_packet_count;
 	p->max_transfer_size = hw->max_transfer_size;
-	p->ahbcfg = GAHBCFG_HBSTLEN_INCR4 << GAHBCFG_HBSTLEN_SHIFT;
+	p->ahbcfg = GAHBCFG_HBSTLEN_INCR << GAHBCFG_HBSTLEN_SHIFT;
 
 	if ((hsotg->dr_mode == USB_DR_MODE_HOST) ||
 	    (hsotg->dr_mode == USB_DR_MODE_OTG)) {
-- 
2.7.4