128 lines
3.9 KiB
Diff
128 lines
3.9 KiB
Diff
From d839c8936020f393c5536d83b783198217243e8d Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Mon, 11 May 2020 13:02:22 +0100
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Subject: [PATCH] media: bcm2835: unicam: Set VPU min clock freq to
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250Mhz.
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When streaming with Unicam, the VPU must have a clock frequency of at
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least 250Mhz. Otherwise, the input fifos could overrun, causing
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image corruption.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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.../media/platform/bcm2835/bcm2835-unicam.c | 49 +++++++++++++++++--
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1 file changed, 44 insertions(+), 5 deletions(-)
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--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
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+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
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@@ -89,6 +89,11 @@ MODULE_PARM_DESC(debug, "Debug level 0-3
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v4l2_err(&(dev)->v4l2_dev, fmt, ##arg)
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/*
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+ * Unicam must request a minimum of 250Mhz from the VPU clock.
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+ * Otherwise the input FIFOs overrun and cause image corruption.
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+ */
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+#define MIN_VPU_CLOCK_RATE (250 * 1000 * 1000)
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+/*
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* To protect against a dodgy sensor driver never returning an error from
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* enum_mbus_code, set a maximum index value to be used.
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*/
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@@ -417,8 +422,10 @@ struct unicam_device {
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void __iomem *base;
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/* clock gating base address */
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void __iomem *clk_gate_base;
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- /* clock handle */
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+ /* lp clock handle */
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struct clk *clock;
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+ /* vpu clock handle */
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+ struct clk *vpu_clock;
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/* V4l2 device */
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struct v4l2_device v4l2_dev;
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struct media_device mdev;
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@@ -1678,16 +1685,28 @@ static int unicam_start_streaming(struct
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unicam_dbg(1, dev, "Running with %u data lanes\n",
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dev->active_data_lanes);
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- ret = clk_set_rate(dev->clock, 100 * 1000 * 1000);
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+ ret = clk_set_min_rate(dev->vpu_clock, MIN_VPU_CLOCK_RATE);
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+ if (ret) {
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+ unicam_err(dev, "failed to set up VPU clock\n");
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+ goto err_pm_put;
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+ }
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+
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+ ret = clk_prepare_enable(dev->vpu_clock);
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if (ret) {
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- unicam_err(dev, "failed to set up clock\n");
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+ unicam_err(dev, "Failed to enable VPU clock: %d\n", ret);
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goto err_pm_put;
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}
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+ ret = clk_set_rate(dev->clock, 100 * 1000 * 1000);
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+ if (ret) {
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+ unicam_err(dev, "failed to set up CSI clock\n");
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+ goto err_vpu_clock;
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+ }
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+
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ret = clk_prepare_enable(dev->clock);
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if (ret) {
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unicam_err(dev, "Failed to enable CSI clock: %d\n", ret);
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- goto err_pm_put;
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+ goto err_vpu_clock;
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}
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for (i = 0; i < ARRAY_SIZE(dev->node); i++) {
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@@ -1721,6 +1740,11 @@ static int unicam_start_streaming(struct
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err_disable_unicam:
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unicam_disable(dev);
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clk_disable_unprepare(dev->clock);
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+err_vpu_clock:
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+ ret = clk_set_min_rate(dev->vpu_clock, 0);
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+ if (ret)
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+ unicam_err(dev, "failed to reset the VPU clock\n");
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+ clk_disable_unprepare(dev->vpu_clock);
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err_pm_put:
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unicam_runtime_put(dev);
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err_streaming:
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@@ -1738,6 +1762,8 @@ static void unicam_stop_streaming(struct
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node->streaming = false;
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if (node->pad_id == IMAGE_PAD) {
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+ int ret;
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+
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/*
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* Stop streaming the sensor and disable the peripheral.
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* We cannot continue streaming embedded data with the
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@@ -1747,6 +1773,12 @@ static void unicam_stop_streaming(struct
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unicam_err(dev, "stream off failed in subdev\n");
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unicam_disable(dev);
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+
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+ ret = clk_set_min_rate(dev->vpu_clock, 0);
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+ if (ret)
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+ unicam_err(dev, "failed to reset the min VPU clock\n");
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+
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+ clk_disable_unprepare(dev->vpu_clock);
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clk_disable_unprepare(dev->clock);
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unicam_runtime_put(dev);
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@@ -2750,11 +2782,18 @@ static int unicam_probe(struct platform_
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unicam->clock = devm_clk_get(&pdev->dev, "lp");
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if (IS_ERR(unicam->clock)) {
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- unicam_err(unicam, "Failed to get clock\n");
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+ unicam_err(unicam, "Failed to get lp clock\n");
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ret = PTR_ERR(unicam->clock);
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goto err_unicam_put;
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}
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+ unicam->vpu_clock = devm_clk_get(&pdev->dev, "vpu");
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+ if (IS_ERR(unicam->vpu_clock)) {
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+ unicam_err(unicam, "Failed to get vpu clock\n");
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+ ret = PTR_ERR(unicam->vpu_clock);
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+ goto err_unicam_put;
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+ }
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+
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ret = platform_get_irq(pdev, 0);
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if (ret <= 0) {
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dev_err(&pdev->dev, "No IRQ resource\n");
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