linux-kernel - [PATCH v4 6/6] drm/stm: set framebuffer bit depth through DTS property

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Date:   Mon, 19 Jun 2023 18:55:25 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Philippe Cornu <philippe.cornu@...s.st.com>,
        Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Yannick Fertre <yannick.fertre@...s.st.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH v4 6/6] drm/stm: set framebuffer bit depth through DTS property

The patch, which is backwards compatible, sets the bit depth of the
framebuffer using the optional property 'st,fb-bpp' in the DTS.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v4:
- Use DTS property instead of module parameter to set the framebuffer bit depth.

Changes in v3:
- drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
- drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc

 drivers/gpu/drm/stm/drv.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
index 422220df7d8c..7a61a3c63469 100644
--- a/drivers/gpu/drm/stm/drv.c
+++ b/drivers/gpu/drm/stm/drv.c
@@ -180,7 +180,9 @@ static const struct dev_pm_ops drv_pm_ops = {
 static int stm_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node;
 	struct drm_device *ddev;
+	u32 fb_bpp = 16;
 	int ret;
 
 	DRM_DEBUG("%s\n", __func__);
@@ -203,7 +205,9 @@ static int stm_drm_platform_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_put;
 
-	drm_fbdev_dma_setup(ddev, 16);
+	of_property_read_u32(np, "st,fb-bpp", &fb_bpp);
+
+	drm_fbdev_dma_setup(ddev, fb_bpp);
 
 	return 0;
 
-- 
2.32.0