From: Kever Yang <kever.yang@rock-chips.com>
To: Douglas Anderson <dianders@chromium.org>,
John Youn <John.Youn@synopsys.com>,
balbi@ti.com
Cc: william.wu@rock-chips.com, huangtao@rock-chips.com,
heiko@sntech.de, linux-rockchip@lists.infradead.org,
Julius Werner <jwerner@chromium.org>,
gregory.herrero@intel.com, yousaf.kaukab@intel.com,
dinguyen@opensource.altera.com, stern@rowland.harvard.edu,
ming.lei@canonical.com, johnyoun@synopsys.com,
gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 03/21] usb: dwc2: host: Set host_rx_fifo_size to 528 for rk3066
Date: Wed, 27 Jan 2016 18:13:12 +0800 [thread overview]
Message-ID: <56A89838.3040202@rock-chips.com> (raw)
In-Reply-To: <1453486736-15358-4-git-send-email-dianders@chromium.org>
Hi Doug,
On 01/23/2016 02:18 AM, Douglas Anderson wrote:
> As documented in dwc2_calculate_dynamic_fifo(), host_rx_fifo_size should
> really be:
> 2 * ((Largest Packet size / 4) + 1 + 1) + n
> with n = number of host channel.
>
> We have 9 host channels, so
> 2 * ((1024/4) + 2) + 9 = 516 + 9 = 525
>
> We've got 960 / 972 total_fifo_size on rk3288 (and presumably on
> rk3066) and 525 + 128 + 256 = 909 so we're still under on both ports
> even when we increment by 5.
>
> Since we have space, Kever Yang suggests bumping by 8. He says this
> will meet INCR16 access and next fifo type can start with a aligned
> address.
I have double check this feature, the INCR16 is actually a burst 16
on to the bus, the aligned problem only happen on the DRAM
access, and it's OK for internal RAM access via internal DMA.
Bump to 8 looks much better when we check the FIFO setting if we
have enough memory, right? :)
rk3066/rk3188/rk3288 have the same hw config for dwc2 controller,
so this patch should works on those files.
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
>
> ...so let's bump up by 8. In the future, it would be nice if
> dwc2_calculate_dynamic_fifo() could handle the "too small" FIFO case and
> come up with something more dynamically. When we do that we can figure
> out how to allocate the extra 48 / 60 bytes of FIFO that we're currently
> wasting.
>
> NOTE: no known bugs are fixed by this patch, but it seems like a simple
> fix and ought to fix someone.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
> Changes in v5: None
> Changes in v4:
> - Set host_rx_fifo_size to 528 for rk3066 new for v4.
>
> Changes in v3: None
> Changes in v2: None
>
> drivers/usb/dwc2/platform.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index 5008a467ce06..b6d7666e715c 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -126,7 +126,7 @@ static const struct dwc2_core_params params_rk3066 = {
> .speed = -1,
> .enable_dynamic_fifo = 1,
> .en_multiple_tx_fifo = -1,
> - .host_rx_fifo_size = 520, /* 520 DWORDs */
> + .host_rx_fifo_size = 528, /* 528 DWORDs */
> .host_nperio_tx_fifo_size = 128, /* 128 DWORDs */
> .host_perio_tx_fifo_size = 256, /* 256 DWORDs */
> .max_transfer_size = -1,
next prev parent reply other threads:[~2016-01-27 10:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-22 18:18 [PATCH v5 0/21] usb: dwc2: host: Fix and speed up all the stuff, especially with splits Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 01/21] usb: dwc2: rockchip: Make the max_transfer_size automatic Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 02/21] usb: dwc2: host: Get aligned DMA in a more supported way Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 03/21] usb: dwc2: host: Set host_rx_fifo_size to 528 for rk3066 Douglas Anderson
2016-01-27 10:13 ` Kever Yang [this message]
2016-01-27 19:44 ` Doug Anderson
2016-01-28 8:28 ` Kever Yang
2016-01-22 18:18 ` [PATCH v5 04/21] usb: dwc2: host: Set host_perio_tx_fifo_size to 304 " Douglas Anderson
2016-01-28 3:10 ` Kever Yang
2016-01-28 3:28 ` Doug Anderson
2016-01-28 6:41 ` Kever Yang
2016-01-28 18:16 ` Doug Anderson
2016-01-28 23:25 ` Doug Anderson
2016-01-22 18:18 ` [PATCH v5 05/21] usb: dwc2: host: Avoid use of chan->qh after qh freed Douglas Anderson
2016-01-28 3:25 ` Kever Yang
2016-01-28 23:26 ` Doug Anderson
2016-01-22 18:18 ` [PATCH v5 06/21] usb: dwc2: host: Always add to the tail of queues Douglas Anderson
2016-01-27 10:23 ` Kever Yang
2016-01-22 18:18 ` [PATCH v5 07/21] usb: dwc2: hcd: fix split transfer schedule sequence Douglas Anderson
2016-01-28 1:20 ` Kever Yang
2016-01-22 18:18 ` [PATCH v5 08/21] usb: dwc2: host: Add scheduler tracing Douglas Anderson
2016-01-28 3:39 ` Kever Yang
2016-01-22 18:18 ` [PATCH v5 09/21] usb: dwc2: host: Add a delay before releasing periodic bandwidth Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 10/21] usb: dwc2: host: Giveback URB in tasklet context Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 11/21] usb: dwc2: host: Use periodic interrupt even with DMA Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 12/21] usb: dwc2: host: Rename some fields in struct dwc2_qh Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 13/21] usb: dwc2: host: Reorder things in hcd_queue.c Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 14/21] usb: dwc2: host: Split code out to make dwc2_do_reserve() Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 15/21] usb: dwc2: host: Add scheduler logging for missed SOFs Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 16/21] usb: dwc2: host: Manage frame nums better in scheduler Douglas Anderson
2016-01-27 20:49 ` Doug Anderson
2016-01-22 18:18 ` [PATCH v5 17/21] usb: dwc2: host: Schedule periodic right away if it's time Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 18/21] usb: dwc2: host: Add dwc2_hcd_get_future_frame_number() call Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 19/21] usb: dwc2: host: Properly set even/odd frame Douglas Anderson
2016-01-22 18:18 ` [PATCH v5 20/21] usb: dwc2: host: Totally redo the microframe scheduler Douglas Anderson
2016-01-24 5:44 ` Doug Anderson
2016-01-22 18:18 ` [PATCH v5 21/21] usb: dwc2: host: If using uframe scheduler, end splits better Douglas Anderson
2016-01-23 17:52 ` [PATCH v5 0/21] usb: dwc2: host: Fix and speed up all the stuff, especially with splits Heiko Stuebner
2016-01-23 23:09 ` Doug Anderson
2016-01-24 5:36 ` Doug Anderson
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