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88 lines
2.9 KiB
Diff
88 lines
2.9 KiB
Diff
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From 4633a7bc5ffc15fe24c05e52f17a72c346baab6b Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Tue, 17 Dec 2019 09:58:34 +0100
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Subject: [PATCH] i2c: brcmstb: Support BCM2711 HDMI BSC controllers
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The HDMI blocks in the BCM2771 have an i2c controller to retrieve the
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EDID. This block is split into two parts, the BSC and the AUTO_I2C,
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lying in two separate register areas.
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The AUTO_I2C block has a mailbox-like interface and will take away the
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BSC control from the CPU if enabled. However, the BSC is the actually
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the same controller than the one supported by the brcmstb driver, and
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the AUTO_I2C doesn't really bring any immediate benefit.
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Let's use the BSC then, but let's also tie the AUTO_I2C registers with a
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separate compatible so that we can enable AUTO_I2C if needed in the
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future.
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The AUTO_I2C is enabled by default at boot though, so we first need to
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release the BSC from the AUTO_I2C control.
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Cc: Kamal Dasu <kdasu.kdev@gmail.com>
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Cc: Wolfram Sang <wsa@the-dreams.de>
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Cc: bcm-kernel-feedback-list@broadcom.com
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Cc: linux-i2c@vger.kernel.org
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/i2c/busses/i2c-brcmstb.c | 33 ++++++++++++++++++++++++++++++++
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1 file changed, 33 insertions(+)
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--- a/drivers/i2c/busses/i2c-brcmstb.c
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+++ b/drivers/i2c/busses/i2c-brcmstb.c
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@@ -580,6 +580,31 @@ static void brcmstb_i2c_set_bsc_reg_defa
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brcmstb_i2c_set_bus_speed(dev);
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}
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+#define AUTOI2C_CTRL0 0x26c
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+#define AUTOI2C_CTRL0_RELEASE_BSC BIT(1)
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+
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+static int bcm2711_release_bsc(struct brcmstb_i2c_dev *dev)
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+{
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+ struct platform_device *pdev = to_platform_device(dev->device);
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+ struct resource *iomem;
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+ void __iomem *autoi2c;
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+
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+ /* Map hardware registers */
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+ iomem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "auto-i2c");
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+ autoi2c = devm_ioremap_resource(&pdev->dev, iomem);
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+ if (IS_ERR(autoi2c))
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+ return PTR_ERR(autoi2c);
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+
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+ writel(AUTOI2C_CTRL0_RELEASE_BSC, autoi2c + AUTOI2C_CTRL0);
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+ devm_iounmap(&pdev->dev, autoi2c);
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+
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+ /* We need to reset the controller after the release */
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+ dev->bsc_regmap->iic_enable = 0;
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+ bsc_writel(dev, dev->bsc_regmap->iic_enable, iic_enable);
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+
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+ return 0;
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+}
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+
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static int brcmstb_i2c_probe(struct platform_device *pdev)
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{
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int rc = 0;
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@@ -609,6 +634,13 @@ static int brcmstb_i2c_probe(struct plat
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goto probe_errorout;
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}
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+ if (of_device_is_compatible(dev->device->of_node,
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+ "brcm,bcm2711-hdmi-i2c")) {
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+ rc = bcm2711_release_bsc(dev);
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+ if (rc)
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+ goto probe_errorout;
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+ }
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+
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rc = of_property_read_string(dev->device->of_node, "interrupt-names",
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&int_name);
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if (rc < 0)
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@@ -705,6 +737,7 @@ static SIMPLE_DEV_PM_OPS(brcmstb_i2c_pm,
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static const struct of_device_id brcmstb_i2c_of_match[] = {
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{.compatible = "brcm,brcmstb-i2c"},
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{.compatible = "brcm,brcmper-i2c"},
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+ {.compatible = "brcm,bcm2711-hdmi-i2c"},
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{},
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};
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MODULE_DEVICE_TABLE(of, brcmstb_i2c_of_match);
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