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Date: Thu, 8 Dec 2016 11:42:56 +0100
From: Alexandre Torgue <alexandre.torgue@...com>
To: Niklas Cassel <niklas.cassel@...s.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jonathan Corbet <corbet@....net>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
"David S. Miller" <davem@...emloft.net>,
Phil Reid <preid@...ctromag.com.au>,
Eric Engestrom <eric@...estrom.ch>,
Pavel Machek <pavel@....cz>,
Andreas Färber <afaerber@...e.de>,
Joachim Eastwood <manabian@...il.com>,
Vincent Palatin <vpalatin@...omium.org>,
Gabriel Fernandez <gabriel.fernandez@...aro.org>
CC: Niklas Cassel <niklass@...s.com>, <netdev@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 6/6] net: smmac: allow configuring lower pbl values
Hi Niklas,
On 12/07/2016 03:20 PM, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@...s.com>
>
> The driver currently always sets the PBLx8/PBLx4 bit, which means that
> the pbl values configured via the pbl/txpbl/rxpbl DT properties are
> always multiplied by 8/4 in the hardware.
>
> In order to allow the DT to configure lower pbl values, while at the
> same time not changing behavior of any existing device trees using the
> pbl/txpbl/rxpbl settings, add a property to disable the multiplication
> of the pbl by 8/4 in the hardware.
>
> Suggested-by: Rabin Vincent <rabinv@...s.com>
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
Thanks for this patch, you can add my Acked-by.
Thanks for the whole series.
Alex
> ---
> Documentation/devicetree/bindings/net/stmmac.txt | 2 ++
> Documentation/networking/stmmac.txt | 5 ++++-
> drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 3 ++-
> drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 3 ++-
> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 2 ++
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 +
> include/linux/stmmac.h | 1 +
> 7 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index 8080038ff1b2..128da752fec9 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -39,6 +39,8 @@ Optional properties:
> If set, DMA tx will use this value rather than snps,pbl.
> - snps,rxpbl Rx Programmable Burst Length. Only for GMAC and newer.
> If set, DMA rx will use this value rather than snps,pbl.
> +- snps,no-pbl-x8 Don't multiply the pbl/txpbl/rxpbl values by 8.
> + For core rev < 3.50, don't multiply the values by 4.
> - snps,aal Address-Aligned Beats
> - snps,fixed-burst Program the DMA to use the fixed burst mode
> - snps,mixed-burst Program the DMA to use the mixed burst mode
> diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
> index 6add57374f70..2bb07078f535 100644
> --- a/Documentation/networking/stmmac.txt
> +++ b/Documentation/networking/stmmac.txt
> @@ -152,8 +152,9 @@ Where:
> o dma_cfg: internal DMA parameters
> o pbl: the Programmable Burst Length is maximum number of beats to
> be transferred in one DMA transaction.
> - GMAC also enables the 4xPBL by default.
> + GMAC also enables the 4xPBL by default. (8xPBL for GMAC 3.50 and newer)
> o txpbl/rxpbl: GMAC and newer supports independent DMA pbl for tx/rx.
> + o pblx8: Enable 8xPBL (4xPBL for core rev < 3.50). Enabled by default.
> o fixed_burst/mixed_burst/aal
> o clk_csr: fixed CSR Clock range selection.
> o has_gmac: uses the GMAC core.
> @@ -208,6 +209,7 @@ struct stmmac_dma_cfg {
> int pbl;
> int txpbl;
> int rxpbl;
> + bool pblx8;
> int fixed_burst;
> int mixed_burst;
> bool aal;
> @@ -219,6 +221,7 @@ Where:
> If set, DMA tx will use this value rather than pbl.
> o rxpbl: Receive Programmable Burst Length. Only for GMAC and newer.
> If set, DMA rx will use this value rather than pbl.
> + o pblx8: Enable 8xPBL (4xPBL for core rev < 3.50). Enabled by default.
> o fixed_burst: program the DMA to use the fixed burst mode
> o mixed_burst: program the DMA to use the mixed burst mode
> o aal: Address-Aligned Beats
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
> index 99b8040af592..612d3aaac9a4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
> @@ -98,7 +98,8 @@ static void dwmac1000_dma_init(void __iomem *ioaddr,
> * Note: before stmmac core 3.50 this mode bit was 4xPBL, and
> * post 3.5 mode bit acts as 8*PBL.
> */
> - value |= DMA_BUS_MODE_MAXPBL;
> + if (dma_cfg->pblx8)
> + value |= DMA_BUS_MODE_MAXPBL;
> value |= DMA_BUS_MODE_USP;
> value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK);
> value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> index 2c3b2098f350..8196ab5fc33c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> @@ -84,7 +84,8 @@ static void dwmac4_dma_init_channel(void __iomem *ioaddr,
> * on each channel
> */
> value = readl(ioaddr + DMA_CHAN_CONTROL(channel));
> - value = value | DMA_BUS_MODE_PBL;
> + if (dma_cfg->pblx8)
> + value = value | DMA_BUS_MODE_PBL;
> writel(value, ioaddr + DMA_CHAN_CONTROL(channel));
>
> value = readl(ioaddr + DMA_CHAN_TX_CONTROL(channel));
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> index 56c8a2342c14..a2831773431a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> @@ -81,6 +81,7 @@ static void stmmac_default_data(struct plat_stmmacenet_data *plat)
> plat->mdio_bus_data->phy_mask = 0;
>
> plat->dma_cfg->pbl = 32;
> + plat->dma_cfg->pblx8 = true;
> /* TODO: AXI */
>
> /* Set default value for multicast hash bins */
> @@ -115,6 +116,7 @@ static int quark_default_data(struct plat_stmmacenet_data *plat,
> plat->mdio_bus_data->phy_mask = 0;
>
> plat->dma_cfg->pbl = 16;
> + plat->dma_cfg->pblx8 = true;
> plat->dma_cfg->fixed_burst = 1;
> /* AXI (TODO) */
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 96afe0561c99..082cd48db6a7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -317,6 +317,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
> dma_cfg->pbl = DEFAULT_DMA_PBL;
> of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl);
> of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl);
> + dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8");
>
> dma_cfg->aal = of_property_read_bool(np, "snps,aal");
> dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index e6d7a5940819..266dab9ad782 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -90,6 +90,7 @@ struct stmmac_dma_cfg {
> int pbl;
> int txpbl;
> int rxpbl;
> + bool pblx8;
> int fixed_burst;
> int mixed_burst;
> bool aal;
>
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