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From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-sunxi@googlegroups.com
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Yong Deng <yong.deng@magewell.com>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Vinod Koul <vkoul@kernel.org>,
	Helen Koike <helen.koike@collabora.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Hans Verkuil <hans.verkuil@cisco.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	kevin.lhopital@hotmail.com
Subject: [PATCH 14/14] media: sunxi: sun8i-a83t-mipi-csi2: Avoid using the (unsolicited) interrupt
Date: Fri, 23 Oct 2020 19:45:46 +0200
Message-ID: <20201023174546.504028-15-paul.kocialkowski@bootlin.com> (raw)
In-Reply-To: <20201023174546.504028-1-paul.kocialkowski@bootlin.com>

The A83T MIPI CSI-2 apparently produces interrupts regardless of the mask
registers, for example when a transmission error occurs.

This generates quite a flood when unsolicited interrupts are received on
each received frame. As a result, disable the interrupt for now since
we are not currently using it for error reporting.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
 .../sun8i_a83t_mipi_csi2.c                    | 40 -------------------
 1 file changed, 40 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
index 1ff6f5dfd81a..26af3e3f5f89 100644
--- a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
+++ b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
@@ -25,34 +25,6 @@
 
 /* Core */
 
-static irqreturn_t sun8i_a83t_mipi_csi2_isr(int irq, void *dev_id)
-{
-	struct sun8i_a83t_mipi_csi2_dev *cdev =
-		(struct sun8i_a83t_mipi_csi2_dev *)dev_id;
-	struct regmap *regmap = cdev->regmap;
-	u32 status;
-
-	WARN_ONCE(1, MODULE_NAME
-		  ": Unsolicited interrupt, an error likely occurred!\n");
-
-	regmap_read(regmap, SUN8I_A83T_MIPI_CSI2_INT_STA0_REG, &status);
-	regmap_write(regmap, SUN8I_A83T_MIPI_CSI2_INT_STA0_REG, status);
-
-	regmap_read(regmap, SUN8I_A83T_MIPI_CSI2_INT_STA1_REG, &status);
-	regmap_write(regmap, SUN8I_A83T_MIPI_CSI2_INT_STA1_REG, status);
-
-	regmap_read(regmap, SUN8I_A83T_MIPI_CSI2_INT_MSK0_REG, &status);
-	regmap_read(regmap, SUN8I_A83T_MIPI_CSI2_INT_MSK1_REG, &status);
-
-	/*
-	 * The interrupt can be used to catch transmission errors.
-	 * However, we currently lack plumbing for reporting that to the
-	 * A31 CSI controller driver.
-	 */
-
-	return IRQ_HANDLED;
-}
-
 static void sun8i_a83t_mipi_csi2_init(struct sun8i_a83t_mipi_csi2_dev *cdev)
 {
 	struct regmap *regmap = cdev->regmap;
@@ -587,7 +559,6 @@ static int sun8i_a83t_mipi_csi2_resource_request(struct sun8i_a83t_mipi_csi2_dev
 {
 	struct resource *res;
 	void __iomem *io_base;
-	int irq;
 	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -626,17 +597,6 @@ static int sun8i_a83t_mipi_csi2_resource_request(struct sun8i_a83t_mipi_csi2_dev
 		return PTR_ERR(cdev->reset);
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return -ENXIO;
-
-	ret = devm_request_irq(&pdev->dev, irq, sun8i_a83t_mipi_csi2_isr, 0,
-			       MODULE_NAME, cdev);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request MIPI CSI-2 IRQ\n");
-		return ret;
-	}
-
 	ret = sun8i_a83t_dphy_register(cdev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to init MIPI D-PHY\n");
-- 
2.28.0


  parent reply index

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-23 17:45 [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 01/14] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes Paul Kocialkowski
2020-10-23 18:18   ` [linux-sunxi] " Jernej Škrabec
2020-10-24  8:31     ` Paul Kocialkowski
2020-10-30 22:44   ` Helen Koike
2020-10-23 17:45 ` [PATCH 02/14] phy: allwinner: phy-sun6i-mipi-dphy: Support D-PHY Rx mode for MIPI CSI-2 Paul Kocialkowski
2020-10-26 15:38   ` Maxime Ripard
2020-10-27  9:23     ` Paul Kocialkowski
2020-10-27 18:28       ` Maxime Ripard
2020-11-04 10:53         ` Paul Kocialkowski
2020-10-30 22:44   ` Helen Koike
2020-11-04 10:54     ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 03/14] media: sun6i-csi: Support an optional dedicated memory pool Paul Kocialkowski
2020-10-26 15:41   ` Maxime Ripard
2020-10-27  9:26     ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 04/14] media: sun6i-csi: Fix the image storage bpp for 10/12-bit Bayer formats Paul Kocialkowski
2020-10-30 22:45   ` Helen Koike
2020-11-04 10:56     ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 05/14] media: sun6i-csi: Only configure the interface data width for parallel Paul Kocialkowski
2020-10-26 16:00   ` Maxime Ripard
2020-10-27  9:31     ` Paul Kocialkowski
2020-10-27 18:31       ` Maxime Ripard
2020-10-23 17:45 ` [PATCH 06/14] media: sun6i-csi: Support feeding from the MIPI CSI-2 controller Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 07/14] dt-bindings: media: i2c: Add A31 MIPI CSI-2 bindings documentation Paul Kocialkowski
2020-10-26 16:14   ` Maxime Ripard
2020-10-27  9:52     ` Paul Kocialkowski
2020-10-27 18:44       ` Maxime Ripard
2020-11-04 10:48         ` Paul Kocialkowski
2020-11-04 16:53           ` Maxime Ripard
2020-10-30 16:33   ` Rob Herring
2020-10-30 16:56   ` Sakari Ailus
2020-10-23 17:45 ` [PATCH 08/14] media: sunxi: Add support for the A31 MIPI CSI-2 controller Paul Kocialkowski
2020-10-26  8:39   ` Dan Carpenter
2020-10-26 16:54   ` Maxime Ripard
2020-11-04 11:34     ` Paul Kocialkowski
2020-11-04 18:56       ` Maxime Ripard
2020-11-05 14:52         ` Paul Kocialkowski
2020-10-30 22:45   ` Helen Koike
2020-11-02  9:21     ` Maxime Ripard
2020-11-04 11:17       ` Paul Kocialkowski
2020-11-04 16:38         ` Helen Koike
2020-11-04 18:45           ` Maxime Ripard
2020-11-05 14:14             ` Helen Koike
2020-11-05  8:45   ` Sakari Ailus
2020-11-05 14:55     ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 09/14] ARM: dts: sun8i: v3s: Add CSI0 camera interface node Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 10/14] ARM: dts: sun8i: v3s: Add MIPI D-PHY and MIPI CSI-2 interface nodes Paul Kocialkowski
2020-10-26 16:55   ` Maxime Ripard
2020-10-23 17:45 ` [PATCH 11/14] dt-bindings: media: i2c: Add A83T MIPI CSI-2 bindings documentation Paul Kocialkowski
2020-10-26 16:56   ` Maxime Ripard
2020-11-04 10:33     ` Paul Kocialkowski
2020-11-05  8:48   ` Sakari Ailus
2020-10-23 17:45 ` [PATCH 12/14] media: sunxi: Add support for the A83T MIPI CSI-2 controller Paul Kocialkowski
2020-10-26  8:53   ` Dan Carpenter
2020-10-26 17:00   ` Maxime Ripard
2020-11-04 10:37     ` Paul Kocialkowski
2020-10-23 17:45 ` [PATCH 13/14] ARM: dts: sun8i: a83t: Add MIPI CSI-2 controller node Paul Kocialkowski
2020-10-23 17:45 ` Paul Kocialkowski [this message]
2020-10-26 16:57   ` [PATCH 14/14] media: sunxi: sun8i-a83t-mipi-csi2: Avoid using the (unsolicited) interrupt Maxime Ripard
2020-10-26 17:20 ` [PATCH 00/14] Allwinner MIPI CSI-2 support for A31/V3s/A83T Maxime Ripard
2020-10-30 22:44 ` Helen Koike
2020-11-02  9:17   ` Maxime Ripard
2020-11-04 11:11   ` Paul Kocialkowski
2020-11-04 11:14     ` Paul Kocialkowski
2020-11-04 16:36     ` Helen Koike
2020-11-05 14:58       ` Paul Kocialkowski

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