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Message-ID: <20241111235345.2vpht6ck2bwojdc7@synopsys.com>
Date: Mon, 11 Nov 2024 23:53:48 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Selvarasu Ganesan <selvarasu.g@...sung.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"quic_akakum@...cinc.com" <quic_akakum@...cinc.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
"jh0801.jung@...sung.com" <jh0801.jung@...sung.com>,
"dh10.jung@...sung.com" <dh10.jung@...sung.com>,
"naushad@...sung.com" <naushad@...sung.com>,
"akash.m5@...sung.com" <akash.m5@...sung.com>,
"rc93.raju@...sung.com" <rc93.raju@...sung.com>,
"taehyun.cho@...sung.com" <taehyun.cho@...sung.com>,
"hongpooh.kim@...sung.com" <hongpooh.kim@...sung.com>,
"eomji.oh@...sung.com" <eomji.oh@...sung.com>,
"shijie.cai@...sung.com" <shijie.cai@...sung.com>,
"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc3: gadget: Add TxFIFO resizing supports for
single port RAM
On Mon, Nov 11, 2024, Selvarasu Ganesan wrote:
> The existing implementation of the TxFIFO resizing logic only supports
> scenarios where more than one port RAM is used. However, there is a need
> to resize the TxFIFO in USB2.0-only mode where only a single port RAM is
> available. This commit introduces the necessary changes to support
> TxFIFO resizing in such scenarios.
>
> Cc: stable@...r.kernel.org # 6.12.x: fad16c82: usb: dwc3: gadget: Refine the logic for resizing Tx FIFOs
You should reword the patch $subject and commit message along the line
of adding missing check for single port ram. For this to qualify for
stable, emphasize that this is a fix for certain platform
configurations. Then add a Fixes tag that can go as far as 9f607a309fbe
("usb: dwc3: Resize TX FIFOs to meet EP bursting requirements")
> Signed-off-by: Selvarasu Ganesan <selvarasu.g@...sung.com>
> ---
>
> Changes in v2:
> - Removed the code change that limits the number of FIFOs for bulk EP,
> as plan to address this issue in a separate patch.
> - Renamed the variable spram_type to is_single_port_ram for better
> understanding.
> - Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/lkml/20241107104040.502-1-selvarasu.g@samsung.com/__;!!A4F2R9G_pg!YvZ4F4z6U6Ba9Z6hgsw4-mLPvm9QBopNIbgMe7WSqj7VCUqf9-JQTSV4RE6OdXCw3hJR9suHcjqVrsRlZ7_3ZXQkbAs$
> ---
> drivers/usb/dwc3/core.h | 4 +++
> drivers/usb/dwc3/gadget.c | 54 +++++++++++++++++++++++++++++++++------
> 2 files changed, 50 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index eaa55c0cf62f..8306b39e5c64 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -915,6 +915,7 @@ struct dwc3_hwparams {
> #define DWC3_MODE(n) ((n) & 0x7)
>
> /* HWPARAMS1 */
> +#define DWC3_SPRAM_TYPE(n) (((n) >> 23) & 1)
> #define DWC3_NUM_INT(n) (((n) & (0x3f << 15)) >> 15)
>
> /* HWPARAMS3 */
> @@ -925,6 +926,9 @@ struct dwc3_hwparams {
> #define DWC3_NUM_IN_EPS(p) (((p)->hwparams3 & \
> (DWC3_NUM_IN_EPS_MASK)) >> 18)
>
> +/* HWPARAMS6 */
> +#define DWC3_RAM0_DEPTH(n) (((n) & (0xffff0000)) >> 16)
> +
> /* HWPARAMS7 */
> #define DWC3_RAM1_DEPTH(n) ((n) & 0xffff)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 2fed2aa01407..4f2e063c9091 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -687,6 +687,44 @@ static int dwc3_gadget_calc_tx_fifo_size(struct dwc3 *dwc, int mult)
> return fifo_size;
> }
>
> +/**
> + * dwc3_gadget_calc_ram_depth - calculates the ram depth for txfifo
> + * @dwc: pointer to the DWC3 context
> + */
> +static int dwc3_gadget_calc_ram_depth(struct dwc3 *dwc)
> +{
> + int ram_depth;
> + int fifo_0_start;
> + bool is_single_port_ram;
> + int tmp;
Try to list this in reversed christmas tree style when possible. Move
declaration of tmp under the if (is_single_port_ram) scope.
> +
> + /* Check supporting RAM type by HW */
> + is_single_port_ram = DWC3_SPRAM_TYPE(dwc->hwparams.hwparams1);
> +
> + /*
> + * If a single port RAM is utilized, then allocate TxFIFOs from
> + * RAM0. otherwise, allocate them from RAM1.
> + */
> + ram_depth = is_single_port_ram ? DWC3_RAM0_DEPTH(dwc->hwparams.hwparams6) :
> + DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
> +
Remove extra new empty line.
> +
> + /*
> + * In a single port RAM configuration, the available RAM is shared
> + * between the RX and TX FIFOs. This means that the txfifo can begin
> + * at a non-zero address.
> + */
> + if (is_single_port_ram) {
> + /* Check if TXFIFOs start at non-zero addr */
> + tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
> + fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp);
> +
> + ram_depth -= (fifo_0_start >> 16);
> + }
> +
> + return ram_depth;
> +}
> +
> /**
> * dwc3_gadget_clear_tx_fifos - Clears txfifo allocation
> * @dwc: pointer to the DWC3 context
> @@ -753,7 +791,7 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
> {
> struct dwc3 *dwc = dep->dwc;
> int fifo_0_start;
> - int ram1_depth;
> + int ram_depth;
> int fifo_size;
> int min_depth;
> int num_in_ep;
> @@ -773,7 +811,7 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
> if (dep->flags & DWC3_EP_TXFIFO_RESIZED)
> return 0;
>
> - ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
> + ram_depth = dwc3_gadget_calc_ram_depth(dwc);
>
> switch (dwc->gadget->speed) {
> case USB_SPEED_SUPER_PLUS:
> @@ -809,7 +847,7 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
>
> /* Reserve at least one FIFO for the number of IN EPs */
> min_depth = num_in_ep * (fifo + 1);
> - remaining = ram1_depth - min_depth - dwc->last_fifo_depth;
> + remaining = ram_depth - min_depth - dwc->last_fifo_depth;
> remaining = max_t(int, 0, remaining);
> /*
> * We've already reserved 1 FIFO per EP, so check what we can fit in
> @@ -835,9 +873,9 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
> dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
>
> /* Check fifo size allocation doesn't exceed available RAM size. */
> - if (dwc->last_fifo_depth >= ram1_depth) {
> + if (dwc->last_fifo_depth >= ram_depth) {
> dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n",
> - dwc->last_fifo_depth, ram1_depth,
> + dwc->last_fifo_depth, ram_depth,
> dep->endpoint.name, fifo_size);
> if (DWC3_IP_IS(DWC3))
> fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
> @@ -3090,7 +3128,7 @@ static int dwc3_gadget_check_config(struct usb_gadget *g)
> struct dwc3 *dwc = gadget_to_dwc(g);
> struct usb_ep *ep;
> int fifo_size = 0;
> - int ram1_depth;
> + int ram_depth;
> int ep_num = 0;
>
> if (!dwc->do_fifo_resize)
> @@ -3113,8 +3151,8 @@ static int dwc3_gadget_check_config(struct usb_gadget *g)
> fifo_size += dwc->max_cfg_eps;
>
> /* Check if we can fit a single fifo per endpoint */
> - ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
> - if (fifo_size > ram1_depth)
> + ram_depth = dwc3_gadget_calc_ram_depth(dwc);
> + if (fifo_size > ram_depth)
> return -ENOMEM;
>
> return 0;
> --
> 2.17.1
>
Other than minor nits, the rest looks fine.
Thanks,
Thinh
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