Hi Thomas,

On 12/3/21 10:35 AM, Thomas Zimmermann wrote:

Hi

Am 03.12.21 um 09:55 schrieb Yannick Fertre:

...

In case of using simplefb or another conflicting framebuffer, call drm_aperture_remove_framebuffers() to remove memory allocated.

Signed-off-by: Yannick Fertre yannick.fertre@foss.st.com

drivers/gpu/drm/stm/drv.c | 5 +++++   1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c index 222869b232ae..5ba46f70f081 100644 --- a/drivers/gpu/drm/stm/drv.c +++ b/drivers/gpu/drm/stm/drv.c @@ -14,6 +14,7 @@   #include <linux/of_platform.h>   #include <linux/pm_runtime.h> +#include <drm/drm_aperture.h>   #include <drm/drm_atomic.h>   #include <drm/drm_atomic_helper.h>   #include <drm/drm_drv.h> @@ -193,6 +194,10 @@ static int stm_drm_platform_probe(struct platform_device *pdev)       if (ret)           goto err_put; +    ret = drm_aperture_remove_framebuffers(false, &drv_driver); +    if (ret) +        goto err_put;

This has to be done at the very top of the probe function, before anything that touches the device. Otherwise both drivers interfere with each other while probing and setup's going on.

Best regards Thomas

...

ret = drm_dev_register(ddev, 0);       if (ret)           goto err_put;

Thanks for reviewing the patch. I will follow your advice and push a new patch.

Yannick