drm/atmel-hlcdc: add support for the nomodeset kernel parameter

According to Documentation/admin-guide/kernel-parameters.txt, this
parameter can be used to disable kernel modesetting.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Dharma Balasubiramani <dharma.b@microchip.com>
Reviewed-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Link: https://patch.msgid.link/20251218-lcd_cleanup_mainline-v2-2-df837aba878f@microchip.com
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 8ed029381c555db10d596efc8d52753c47767633..8ff582a394794aacf84f9e23fd59f123445926a3 100644 (file)
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -858,6 +858,9 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
        struct drm_device *ddev;
        int ret;
 
+       if (drm_firmware_drivers_only())
+               return -ENODEV;
+
        dc = devm_drm_dev_alloc(&pdev->dev, &atmel_hlcdc_dc_driver, struct atmel_hlcdc_dc, dev);
        if (IS_ERR(dc))
                return PTR_ERR(dc);