From: Krishna Yarlagadda <kyarlagadda@nvidia.com>
To: Jonathan Hunter <jonathanh@nvidia.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
Laxman Dewangan <ldewangan@nvidia.com>,
"jslaby@suse.com" <jslaby@suse.com>
Cc: "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Shardar Mohammed" <smohammed@nvidia.com>
Subject: RE: [PATCH 10/14] serial: tegra: add support to use 8 bytes trigger
Date: Tue, 27 Aug 2019 09:31:00 +0000 [thread overview]
Message-ID: <SN6PR12MB27340AB6574C72FD4DCC901DC3A00@SN6PR12MB2734.namprd12.prod.outlook.com> (raw)
In-Reply-To: <dda0d866-ae7a-8655-7b26-4c28249c0be8@nvidia.com>
> -----Original Message-----
> From: Jonathan Hunter <jonathanh@nvidia.com>
> Sent: Tuesday, August 20, 2019 1:59 AM
> To: Krishna Yarlagadda <kyarlagadda@nvidia.com>;
> gregkh@linuxfoundation.org; robh+dt@kernel.org; mark.rutland@arm.com;
> thierry.reding@gmail.com; Laxman Dewangan <ldewangan@nvidia.com>;
> jslaby@suse.com
> Cc: linux-serial@vger.kernel.org; devicetree@vger.kernel.org; linux-
> tegra@vger.kernel.org; linux-kernel@vger.kernel.org; Shardar Mohammed
> <smohammed@nvidia.com>
> Subject: Re: [PATCH 10/14] serial: tegra: add support to use 8 bytes trigger
>
>
> On 12/08/2019 12:28, Krishna Yarlagadda wrote:
> > From: Shardar Shariff Md <smohammed@nvidia.com>
> >
> > Add support to use 8 bytes trigger for Tegra186 SOC.
> >
> > Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
> > Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
> > ---
> > drivers/tty/serial/serial-tegra.c | 13 +++++++++++--
> > 1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
> > index 329923c..03d1d20 100644
> > --- a/drivers/tty/serial/serial-tegra.c
> > +++ b/drivers/tty/serial/serial-tegra.c
> > @@ -88,6 +88,7 @@ struct tegra_uart_chip_data {
> > bool support_clk_src_div;
> > bool fifo_mode_enable_status;
> > int uart_max_port;
> > + int dma_burst_bytes;
>
> I assume that this is a maximum, so why not say max_dma_burst_bytes?
Yes. This is maximum. Will update.
>
> > };
> >
> > struct tegra_uart_port {
> > @@ -933,7 +934,12 @@ static int tegra_uart_hw_init(struct
> tegra_uart_port *tup)
> > * programmed in the DMA registers.
> > */
> > tup->fcr_shadow = UART_FCR_ENABLE_FIFO;
> > - tup->fcr_shadow |= UART_FCR_R_TRIG_01;
> > +
> > + if (tup->cdata->dma_burst_bytes == 8)
> > + tup->fcr_shadow |= UART_FCR_R_TRIG_10;
> > + else
> > + tup->fcr_shadow |= UART_FCR_R_TRIG_01;
> > +
> > tup->fcr_shadow |= TEGRA_UART_TX_TRIG_16B;
> > tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
> >
> > @@ -1046,7 +1052,7 @@ static int
> tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
> > }
> > dma_sconfig.src_addr = tup->uport.mapbase;
> > dma_sconfig.src_addr_width =
> DMA_SLAVE_BUSWIDTH_1_BYTE;
> > - dma_sconfig.src_maxburst = 4;
> > + dma_sconfig.src_maxburst = tup->cdata->dma_burst_bytes;
> > tup->rx_dma_chan = dma_chan;
> > tup->rx_dma_buf_virt = dma_buf;
> > tup->rx_dma_buf_phys = dma_phys;
> > @@ -1325,6 +1331,7 @@ static struct tegra_uart_chip_data
> tegra20_uart_chip_data = {
> > .support_clk_src_div = false,
> > .fifo_mode_enable_status = false,
> > .uart_max_port = 5,
> > + .dma_burst_bytes = 4,
>
> Isn't it simpler to store the TRIG value here?
>
> Jon
TRIG value will have to be converted to max burst and one of it needs to be
derived from other.
KY
>
> --
> nvpublic
next prev parent reply other threads:[~2019-08-27 9:36 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 11:28 [PATCH 00/14] serial: tegra: Tegra186 support and fixes Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 01/14] serial: tegra: add internal loopback functionality Krishna Yarlagadda
2019-08-13 9:38 ` Thierry Reding
2019-08-12 11:28 ` [PATCH 02/14] serial: tegra: add support to ignore read Krishna Yarlagadda
2019-08-13 9:42 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 03/14] serial: tegra: avoid reg access when clk disabled Krishna Yarlagadda
2019-08-13 9:45 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 04/14] serial: tegra: protect IER against LCR.DLAB Krishna Yarlagadda
2019-08-13 9:46 ` Thierry Reding
2019-08-12 11:28 ` [PATCH 05/14] serial: tegra: flush the RX fifo on frame error Krishna Yarlagadda
2019-08-13 9:48 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 06/14] serial: tegra: report error to upper tty layer Krishna Yarlagadda
2019-08-13 9:52 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 07/14] serial: tegra: add compatible for new chips Krishna Yarlagadda
2019-08-13 9:55 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 08/14] serial: tegra: check for FIFO mode enabled status Krishna Yarlagadda
2019-08-13 10:03 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 09/14] serial: tegra: set maximum num of uart ports to 8 Krishna Yarlagadda
2019-08-13 10:19 ` Thierry Reding
2019-08-27 9:30 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 10/14] serial: tegra: add support to use 8 bytes trigger Krishna Yarlagadda
2019-08-19 20:29 ` Jon Hunter
2019-08-27 9:31 ` Krishna Yarlagadda [this message]
2019-08-12 11:28 ` [PATCH 11/14] serial: tegra: DT for Adjusted baud rates Krishna Yarlagadda
2019-08-13 10:24 ` Thierry Reding
2019-08-27 9:31 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 12/14] serial: tegra: add support to adjust baud rate Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 13/14] serial: tegra: report clk rate errors Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 14/14] serial: tegra: Add PIO mode support Krishna Yarlagadda
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