From: Arnd Bergmann <arnd@arndb.de>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: linux-rpi-kernel@lists.infradead.org,
Eric Anholt <eric@anholt.net>,
Ulf Hansson <ulf.hansson@linaro.org>,
Stephen Warren <swarren@wwwdotorg.org>,
Lee Jones <lee@kernel.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:MULTIMEDIA CARD (MMC),
SECURE DIGITAL (SD) AND..." <linux-mmc@vger.kernel.org>,
"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 21/32] mmc: bcm2835-sdhost: Add new driver for the internal SD controller.
Date: Thu, 02 Jun 2016 00:18:52 +0200 [thread overview]
Message-ID: <4715245.LFBOAeJdHc@wuerfel> (raw)
In-Reply-To: <1464817421-8519-22-git-send-email-kraxel@redhat.com>
On Wednesday, June 1, 2016 11:43:30 PM CEST Gerd Hoffmann wrote:
> +static void bcm2835_sdhost_reset_internal(struct bcm2835_host *host)
> +{
> + u32 temp;
> +
> + bcm2835_sdhost_set_power(host, false);
> +
> + bcm2835_sdhost_write(host, 0, SDCMD);
> + bcm2835_sdhost_write(host, 0, SDARG);
> + bcm2835_sdhost_write(host, 0xf00000, SDTOUT);
> + bcm2835_sdhost_write(host, 0, SDCDIV);
> + bcm2835_sdhost_write(host, 0x7f8, SDHSTS); /* Write 1s to clear */
> + bcm2835_sdhost_write(host, 0, SDHCFG);
> + bcm2835_sdhost_write(host, 0, SDHBCT);
> + bcm2835_sdhost_write(host, 0, SDHBLC);
> +
> + /* Limit fifo usage due to silicon bug */
> + temp = bcm2835_sdhost_read(host, SDEDM);
> + temp &= ~((SDEDM_THRESHOLD_MASK << SDEDM_READ_THRESHOLD_SHIFT) |
> + (SDEDM_THRESHOLD_MASK << SDEDM_WRITE_THRESHOLD_SHIFT));
> + temp |= (FIFO_READ_THRESHOLD << SDEDM_READ_THRESHOLD_SHIFT) |
> + (FIFO_WRITE_THRESHOLD << SDEDM_WRITE_THRESHOLD_SHIFT);
> + bcm2835_sdhost_write(host, temp, SDEDM);
> + mdelay(10);
> + bcm2835_sdhost_set_power(host, true);
> + mdelay(10);
Are you sure you cannot use msleep() here?
> + host->clock = 0;
> + bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
> + bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
> + mmiowb();
> +}
What is the barrier for? Same question for all the other instances
> +
> +static void bcm2835_sdhost_reset(struct mmc_host *mmc)
> +{
> + struct bcm2835_host *host = mmc_priv(mmc);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->lock, flags);
> + bcm2835_sdhost_reset_internal(host);
> + spin_unlock_irqrestore(&host->lock, flags);
> +}
The spinlock seems to only protect the reset from happening concurrently
with bcm2835_sdhost_dma_complete() here. So if you ensure that this
function is no longer pending, you can probably use msleep() above.
> +static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
Maybe rearrange the order of the functions to avoid forward declarations?
> + spin_lock_init(&host->lock);
> +
> + if (IS_ERR_OR_NULL(host->dma_chan_tx) ||
> + IS_ERR_OR_NULL(host->dma_chan_rx)) {
> + pr_err("%s: unable to initialise DMA channels. Falling back to PIO\n",
> + mmc_hostname(mmc));
When are these ever NULL?
> + /* Parse OF address directly to get the physical address for
> + * DMA to our registers.
> + */
> + host->phys_addr = be32_to_cpup(of_get_address(pdev->dev.of_node, 0,
> + NULL, NULL));
This looks broken on 64-bit systems when #address-cells=<2>, or if there
is an intermediate bus with a non-empty ranges property.
What's wrong with platform_get_resource(pdev, IORESOURCE_MEM, 0)?
Arnd
next prev parent reply other threads:[~2016-06-01 22:18 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1464817421-8519-1-git-send-email-kraxel@redhat.com>
2016-06-01 21:43 ` [PATCH 01/32] arm64: Add platform selection for BCM2835 Gerd Hoffmann
2016-06-01 21:49 ` Florian Fainelli
2016-06-02 6:45 ` Gerd Hoffmann
2016-06-02 16:25 ` Ray Jui
2016-06-02 16:48 ` Scott Branden
2016-06-02 17:12 ` Gerd Hoffmann
2016-06-02 17:21 ` Scott Branden
2016-06-02 17:36 ` Florian Fainelli
2016-06-02 17:30 ` Catalin Marinas
2016-06-01 21:43 ` [PATCH 02/32] arm64: Add BCM2835 support to the defconfig Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 03/32] irqchip: bcm2835: Avoid arch/arm-specific handle_IRQ Gerd Hoffmann
2016-06-02 0:50 ` Jason Cooper
2016-06-02 18:06 ` Eric Anholt
2016-06-01 21:43 ` [PATCH 04/32] dt-bindings: Add root properties for Raspberry Pi 3 Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 05/32] ARM: bcm2835: Add devicetree for the " Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 06/32] arm64: Fix physical to DMA mappings Gerd Hoffmann
2016-06-02 17:20 ` Catalin Marinas
2016-06-01 21:43 ` [PATCH 07/32] ARM: bcm2835: dt: Add the ethernet to the device trees Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 08/32] ARM: bcm2837: " Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 09/32] bcm2837-rpi-3-b.dts for 32bit arm Gerd Hoffmann
2016-06-01 22:00 ` Arnd Bergmann
2016-06-01 22:30 ` Eric Anholt
2016-06-01 22:39 ` Arnd Bergmann
2016-06-02 6:56 ` Gerd Hoffmann
2016-06-02 7:24 ` Arnd Bergmann
2016-06-02 9:14 ` Gerd Hoffmann
2016-06-02 9:53 ` Arnd Bergmann
2016-06-02 15:11 ` Gerd Hoffmann
2016-06-02 15:23 ` Arnd Bergmann
2016-06-01 21:43 ` [PATCH 10/32] don't force serial pins to uart0 Gerd Hoffmann
2016-06-01 22:19 ` Arnd Bergmann
2016-06-02 18:19 ` Eric Anholt
2016-06-01 21:43 ` [PATCH 11/32] ARM: bcm2835: Define standard pinctrl groups in the gpio node Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 12/32] ARM: bcm2835: Replace alt0/i2s_alt[02] with standard groups Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 13/32] bcm2837-rpi-3-b.dts: add gpio Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 14/32] bcm2837-rpi-3-b.dts: vc4 hdmi fixup Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 15/32] ARM: bcm2835: Move the emmc pin group to bcm283x.dtsi Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 16/32] bcm2837-rpi-3-b.dts: move the emmc pin group Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 17/32] ARM: bcm2835: Add a group for mapping pins 48-53 to sdhost Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 18/32] ARM: bcm2835: Move most RPi default pin groups to their devices Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 19/32] bcm2837-rpi-3-b.dts: move " Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 20/32] dt-bindings: Add binding for brcm,bcm2835-sdhost Gerd Hoffmann
2016-06-06 13:12 ` Rob Herring
2016-06-01 21:43 ` [PATCH 21/32] mmc: bcm2835-sdhost: Add new driver for the internal SD controller Gerd Hoffmann
2016-06-01 22:18 ` Arnd Bergmann [this message]
2016-06-02 18:12 ` Eric Anholt
2016-06-03 8:42 ` Arnd Bergmann
2016-06-21 12:33 ` Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 22/32] ARM: bcm2835: Include SDHOST in the device tree Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 23/32] ARM: bcm2835: Enable SDHOST by default Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 24/32] i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clock Gerd Hoffmann
2016-07-22 7:26 ` Wolfram Sang
2016-06-01 21:43 ` [PATCH 25/32] dt-gpio-fix Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 26/32] enable uart1 on the BT pins Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 27/32] gpio: Add support for the FXL6408 GPIO expander Gerd Hoffmann
2016-06-06 23:50 ` Eric Anholt
2016-06-07 0:02 ` Florian Fainelli
2016-06-08 9:10 ` Linus Walleij
2016-06-09 17:22 ` Eric Anholt
2016-06-01 21:43 ` [PATCH 28/32] i2c: bcm2835: Set up the rising/falling edge delays Gerd Hoffmann
2016-07-22 7:26 ` Wolfram Sang
2016-06-01 21:43 ` [PATCH 29/32] ARM: bcm2835: Use i2c-gpio for the expander, instead Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 30/32] ARM: bcm2835: Add a new EMMC pin group from the downstream tree Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 31/32] enable wireless Gerd Hoffmann
2016-06-01 21:43 ` [PATCH 32/32] mmc: bcm2835: Import bcm2835-mmc and switch to it Gerd Hoffmann
2016-06-02 16:52 ` Stefan Wahren
2016-06-02 18:18 ` Eric Anholt
2016-06-02 19:09 ` Stefan Wahren
2016-06-02 20:03 ` Gerd Hoffmann
2016-06-02 21:40 ` Eric Anholt
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