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Commit 515605b4 authored by Sunil Khatri's avatar Sunil Khatri
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msm: kgsl: Create GPU device node based on gfx fuse 



Create GPU device node only if the fuse is not blown.
If the fuse is blown to non zero value then fail
creation of GPU device node and return with an error
from adreno_probe().

Change-Id: Id1c0f1d9c1e22ddd1e81cca5b267966b28319064
Signed-off-by: default avatarSunil Khatri <sunilkh@codeaurora.org>
parent f38ea00b

Documentation/devicetree/bindings/gpu/adreno.txt

+6 −0
Original line number Diff line number Diff line
@@ -124,6 +124,12 @@ Optional Properties: 
				mask   - mask for the relevant bits in the efuse register.

				shift  - number of bits to right shift to get the speed bin

				value.

- qcom,gpu-disable-fuse:	GPU disable fuse

				<offset mask shift>

				offset - offset of the efuse register from the base.

				mask   - mask for the relevant bits in the efuse register.

				shift  - number of bits to right shift to get the disable_gpu

				fuse bit value.

- qcom,highest-bank-bit:

				Specify the bit of the highest DDR bank. This

				is programmed into protected registers and also

drivers/gpu/msm/adreno.c

+33 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2002,2007-2017, The Linux Foundation. All rights reserved.

/* Copyright (c) 2002,2007-2018, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -955,6 +955,33 @@ adreno_ocmem_free(struct adreno_device *adreno_dev) 
}

#endif



static bool adreno_is_gpu_disabled(struct adreno_device *adreno_dev)

{

	unsigned int row0;

	unsigned int pte_row0_msb[3];

	int ret;

	struct kgsl_device *device = KGSL_DEVICE(adreno_dev);



	if (of_property_read_u32_array(device->pdev->dev.of_node,

		"qcom,gpu-disable-fuse", pte_row0_msb, 3))

		return false;

	/*

	 * Read the fuse value to disable GPU driver if fuse

	 * is blown. By default(fuse value is 0) GPU is enabled.

	 */

	if (adreno_efuse_map(adreno_dev))

		return false;



	ret = adreno_efuse_read_u32(adreno_dev, pte_row0_msb[0], &row0);

	adreno_efuse_unmap(adreno_dev);



	if (ret)

		return false;



	return (row0 >> pte_row0_msb[2]) &

			pte_row0_msb[1] ? true : false;

}



static int adreno_probe(struct platform_device *pdev)

{

	struct kgsl_device *device;
@@ -971,6 +998,11 @@ static int adreno_probe(struct platform_device *pdev) 
	device = KGSL_DEVICE(adreno_dev);

	device->pdev = pdev;



	if (adreno_is_gpu_disabled(adreno_dev)) {

		pr_err("adreno: GPU is disabled on this device");

		return -ENODEV;

	}



	/* Get the chip ID from the DT and set up target specific parameters */

	adreno_identify_gpu(adreno_dev);