linux-kernel - [PATCH 28/60] drm/panel: ilitek-ili9341: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-29-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:36 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>
Subject: [PATCH 28/60] drm/panel: ilitek-ili9341: Add support for the nomodeset kernel parameter

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

DRM drivers will not perform display-mode changes or accelerated rendering
and only the systewm system framebuffer will be available if it was set-up.

But only a few DRM drivers currently check for nomodeset, make this driver
to also support the command line parameter.

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
---

 drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
index 2c3378a259b1..707c5a7bf256 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -611,6 +611,9 @@ static int ili9341_dbi_probe(struct spi_device *spi, struct gpio_desc *dc,
 	u32 rotation = 0;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	vcc = devm_regulator_get_optional(dev, "vcc");
 	if (IS_ERR(vcc))
 		dev_err(dev, "get optional vcc failed\n");
-- 
2.33.1