[git:media_stage/master] media: chips-media: wave5: support reset lines

[Hans Verkuil]

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Subject: media: chips-media: wave5: support reset lines
Author:  Ivan Bornyakov <brnkv...@gmail.com>
Date:    Mon Apr 15 13:07:20 2024 +0300

Add initial support for optional reset lines. For now, simply deassert
resets while probing the driver and assert them back when removing the
driver.

Signed-off-by: Ivan Bornyakov <brnkv...@gmail.com>
Signed-off-by: Sebastian Fricke <sebastian.fri...@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>

 drivers/media/platform/chips-media/wave5/wave5-vpu.c    | 16 +++++++++++++++-
 drivers/media/platform/chips-media/wave5/wave5-vpuapi.h |  1 +
 2 files changed, 16 insertions(+), 1 deletion(-)

---

diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu.c 
b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
index 68a519ac412d..54d1d44ed35a 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
@@ -10,6 +10,7 @@
 #include <linux/clk.h>
 #include <linux/firmware.h>
 #include <linux/interrupt.h>
+#include <linux/reset.h>
 #include "wave5-vpu.h"
 #include "wave5-regdefine.h"
 #include "wave5-vpuconfig.h"
@@ -179,6 +180,16 @@ static int wave5_vpu_probe(struct platform_device *pdev)
        dev_set_drvdata(&pdev->dev, dev);
        dev->dev = &pdev->dev;
 
+       dev->resets = 
devm_reset_control_array_get_optional_exclusive(&pdev->dev);
+       if (IS_ERR(dev->resets)) {
+               return dev_err_probe(&pdev->dev, PTR_ERR(dev->resets),
+                                    "Failed to get reset control\n");
+       }
+
+       ret = reset_control_deassert(dev->resets);
+       if (ret)
+               return dev_err_probe(&pdev->dev, ret, "Failed to deassert 
resets\n");
+
        ret = devm_clk_bulk_get_all(&pdev->dev, &dev->clks);
 
        /* continue without clock, assume externally managed */
@@ -191,7 +202,7 @@ static int wave5_vpu_probe(struct platform_device *pdev)
        ret = clk_bulk_prepare_enable(dev->num_clks, dev->clks);
        if (ret) {
                dev_err(&pdev->dev, "Enabling clocks, fail: %d\n", ret);
-               return ret;
+               goto err_reset_assert;
        }
 
        ret = of_property_read_u32(pdev->dev.of_node, "sram-size",
@@ -282,6 +293,8 @@ err_vdi_release:
        wave5_vdi_release(&pdev->dev);
 err_clk_dis:
        clk_bulk_disable_unprepare(dev->num_clks, dev->clks);
+err_reset_assert:
+       reset_control_assert(dev->resets);
 
        return ret;
 }
@@ -297,6 +310,7 @@ static void wave5_vpu_remove(struct platform_device *pdev)
 
        mutex_destroy(&dev->dev_lock);
        mutex_destroy(&dev->hw_lock);
+       reset_control_assert(dev->resets);
        clk_bulk_disable_unprepare(dev->num_clks, dev->clks);
        wave5_vpu_enc_unregister_device(dev);
        wave5_vpu_dec_unregister_device(dev);
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h 
b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
index fa4dc53949e6..d5c9480242b6 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
@@ -762,6 +762,7 @@ struct vpu_device {
        struct kthread_worker *worker;
        int vpu_poll_interval;
        int num_clks;
+       struct reset_control *resets;
 };
 
 struct vpu_instance;