Commit 00956254 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Sasha Levin

usb: musb: tusb6010_omap: Do not reset the other direction's packet size

[ Upstream commit 6df2b42f ]

We have one register for each EP to set the maximum packet size for both
TX and RX.
If for example an RX programming would happen before the previous TX
transfer finishes we would reset the TX packet side.

To fix this issue, only modify the TX or RX part of the register.

Fixes: 550a7375 ("USB: Add MUSB and TUSB support")
Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarBin Liu <b-liu@ti.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent d7cc01aa
......@@ -220,6 +220,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
u32 dma_remaining;
int src_burst, dst_burst;
u16 csr;
u32 psize;
int ch;
s8 dmareq;
s8 sync_dev;
......@@ -391,15 +392,19 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
if (chdat->tx) {
/* Send transfer_packet_sz packets at a time */
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
chdat->transfer_packet_sz);
psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET);
psize &= ~0x7ff;
psize |= chdat->transfer_packet_sz;
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize);
musb_writel(ep_conf, TUSB_EP_TX_OFFSET,
TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
} else {
/* Receive transfer_packet_sz packets at a time */
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
chdat->transfer_packet_sz << 16);
psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET);
psize &= ~(0x7ff << 16);
psize |= (chdat->transfer_packet_sz << 16);
musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, psize);
musb_writel(ep_conf, TUSB_EP_RX_OFFSET,
TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len));
......
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