linux-kernel - [PATCH 3/3] drm/arm/komeda: update DMA mask to 40 bits

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Message-Id: <20240219100915.192475-4-faiz.abbas@arm.com>
Date: Mon, 19 Feb 2024 15:39:15 +0530
From: Faiz Abbas <faiz.abbas@....com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Cc: liviu.dudau@....com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch,
	Amjad Ouled-Ameur <amjad.ouled-ameur@....com>,
	Faiz Abbas <faiz.abbas@....com>
Subject: [PATCH 3/3] drm/arm/komeda: update DMA mask to 40 bits

From: Amjad Ouled-Ameur <amjad.ouled-ameur@....com>

Each layer in the DPU has a 40-bit base address register, which indicates
start of frame buffer data for that layer. Komeda driver does not set
its DMA mask, which makes it 32-bit by default which does not use
the entire available possible supported by the DPU.

Update the DMA mask to align with DPU Architecture v1.0 spec.

Signed-off-by: Amjad Ouled-Ameur <amjad.ouled-ameur@....com>
Signed-off-by: Faiz Abbas <faiz.abbas@....com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index cc57ea4e13ae..fea5a4818f33 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -59,6 +59,10 @@ static int komeda_platform_probe(struct platform_device *pdev)
 	struct komeda_drv *mdrv;
 	int err;
 
+	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
+	if (err)
+		return dev_err_probe(dev, err, "DMA mask error\n");
+
 	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
 	if (!mdrv)
 		return -ENOMEM;
-- 
2.25.1