[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAPDyKFq-WX2CqEb+F+BxU0BgU+vLQD-x6ykCtoGc0sE3q60Jmw@mail.gmail.com>
Date: Fri, 29 Jan 2016 12:39:58 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Chen-Yu Tsai <wens@...e.org>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>,
Hans de Goede <hdegoede@...hat.com>,
linux-mmc <linux-mmc@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-sunxi@...glegroups.com
Subject: Re: [PATCH RFC 01/15] mmc: sunxi: Document host init sequence
On 21 January 2016 at 06:26, Chen-Yu Tsai <wens@...e.org> wrote:
> sunxi_mmc_init_host() originated from Allwinner kernel sources. The
> magic numbers written to various registers was never documented.
>
> Add comments for values found in Allwinner user manuals.
>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
Thanks, applied for next!
Kind regards
Uffe
> ---
> drivers/mmc/host/sunxi-mmc.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index 83de82bceafc..cce5ca540857 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -284,16 +284,28 @@ static int sunxi_mmc_init_host(struct mmc_host *mmc)
> if (sunxi_mmc_reset_host(host))
> return -EIO;
>
> + /*
> + * Burst 8 transfers, RX trigger level: 7, TX trigger level: 8
> + *
> + * TODO: sun9i has a larger FIFO and supports higher trigger values
> + */
> mmc_writel(host, REG_FTRGL, 0x20070008);
> + /* Maximum timeout value */
> mmc_writel(host, REG_TMOUT, 0xffffffff);
> + /* Unmask SDIO interrupt if needed */
> mmc_writel(host, REG_IMASK, host->sdio_imask);
> + /* Clear all pending interrupts */
> mmc_writel(host, REG_RINTR, 0xffffffff);
> + /* Debug register? undocumented */
> mmc_writel(host, REG_DBGC, 0xdeb);
> + /* Enable CEATA support */
> mmc_writel(host, REG_FUNS, SDXC_CEATA_ON);
> + /* Set DMA descriptor list base address */
> mmc_writel(host, REG_DLBA, host->sg_dma);
>
> rval = mmc_readl(host, REG_GCTRL);
> rval |= SDXC_INTERRUPT_ENABLE_BIT;
> + /* Undocumented, but found in Allwinner code */
> rval &= ~SDXC_ACCESS_DONE_DIRECT;
> mmc_writel(host, REG_GCTRL, rval);
>
> --
> 2.7.0.rc3
>
Powered by blists - more mailing lists