Hi Dan,
I hope you can fine to test this patch from Thomas.
If this works then we can forget about my attempt to do the same.
Hi Thomas,
IRQ_NOTCONNECTED check seems redundant, as mentioned in another patch
already.
With that considered:
Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
We shall wait for testing from Dan before you apply it as I had made a
similar patch that failed to work. I assume my patch was buggy but I
prefer to be sure.
Sam
On Tue, Jul 27, 2021 at 08:27:10PM +0200, Thomas Zimmermann wrote:
> Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
> IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
> don't benefit from using it. DRM IRQ callbacks are now being called
> directly or inlined.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 85 ++++++++++++--------
> 1 file changed, 52 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index f09b6dd8754c..cfa8c2c9c8aa 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -22,7 +22,6 @@
> #include <drm/drm_fb_helper.h>
> #include <drm/drm_gem_cma_helper.h>
> #include <drm/drm_gem_framebuffer_helper.h>
> -#include <drm/drm_irq.h>
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_vblank.h>
>
> @@ -557,6 +556,56 @@ static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
> return IRQ_HANDLED;
> }
>
> +static void atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
> +{
> + struct atmel_hlcdc_dc *dc = dev->dev_private;
> + unsigned int cfg = 0;
> + int i;
> +
> + /* Enable interrupts on activated layers */
> + for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
> + if (dc->layers[i])
> + cfg |= ATMEL_HLCDC_LAYER_STATUS(i);
> + }
> +
> + regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, cfg);
> +}
> +
> +static void atmel_hlcdc_dc_irq_disable(struct drm_device *dev)
> +{
> + struct atmel_hlcdc_dc *dc = dev->dev_private;
> + unsigned int isr;
> +
> + regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
> + regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
> +}
> +
> +static int atmel_hlcdc_dc_irq_install(struct drm_device *dev, unsigned int irq)
> +{
> + int ret;
> +
> + if (irq == IRQ_NOTCONNECTED)
> + return -ENOTCONN;
> +
> + atmel_hlcdc_dc_irq_disable(dev);
> +
> + ret = request_irq(irq, atmel_hlcdc_dc_irq_handler, 0, dev->driver->name, dev);
> + if (ret)
> + return ret;
> +
> + atmel_hlcdc_dc_irq_postinstall(dev);
> +
> + return 0;
> +}
> +
> +static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
> +{
> + struct atmel_hlcdc_dc *dc = dev->dev_private;
> +
> + atmel_hlcdc_dc_irq_disable(dev);
> + free_irq(dc->hlcdc->irq, dev);
> +}
> +
> static const struct drm_mode_config_funcs mode_config_funcs = {
> .fb_create = drm_gem_fb_create,
> .atomic_check = drm_atomic_helper_check,
> @@ -647,7 +696,7 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
> drm_mode_config_reset(dev);
>
> pm_runtime_get_sync(dev->dev);
> - ret = drm_irq_install(dev, dc->hlcdc->irq);
> + ret = atmel_hlcdc_dc_irq_install(dev, dc->hlcdc->irq);
> pm_runtime_put_sync(dev->dev);
> if (ret < 0) {
> dev_err(dev->dev, "failed to install IRQ handler\n");
> @@ -676,7 +725,7 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
> drm_mode_config_cleanup(dev);
>
> pm_runtime_get_sync(dev->dev);
> - drm_irq_uninstall(dev);
> + atmel_hlcdc_dc_irq_uninstall(dev);
> pm_runtime_put_sync(dev->dev);
>
> dev->dev_private = NULL;
> @@ -685,40 +734,10 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
> clk_disable_unprepare(dc->hlcdc->periph_clk);
> }
>
> -static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
> -{
> - struct atmel_hlcdc_dc *dc = dev->dev_private;
> - unsigned int cfg = 0;
> - int i;
> -
> - /* Enable interrupts on activated layers */
> - for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
> - if (dc->layers[i])
> - cfg |= ATMEL_HLCDC_LAYER_STATUS(i);
> - }
> -
> - regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, cfg);
> -
> - return 0;
> -}
> -
> -static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
> -{
> - struct atmel_hlcdc_dc *dc = dev->dev_private;
> - unsigned int isr;
> -
> - regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
> - regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
> -}
> -
> DEFINE_DRM_GEM_CMA_FOPS(fops);
>
> static const struct drm_driver atmel_hlcdc_dc_driver = {
> .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> - .irq_handler = atmel_hlcdc_dc_irq_handler,
> - .irq_preinstall = atmel_hlcdc_dc_irq_uninstall,
> - .irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
> - .irq_uninstall = atmel_hlcdc_dc_irq_uninstall,
> DRM_GEM_CMA_DRIVER_OPS,
> .fops = &fops,
> .name = "atmel-hlcdc",
> --
> 2.32.0
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