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drm/msm/adreno: Add a modparam to skip GPU

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During bringup of a new GPU support, it is convenient to have knob to
quickly disable GPU, but keep the display support. This helps to
fallback to 'kms_swrast' in case of bootup issues due to GPU. Add a
modparam to support this.

Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/672262/
Link: https://lore.kernel.org/r/20250902-assorted-sept-1-v1-3-f3ec9baed513@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Akhil P Oommen 2025-09-02 17:20:02 +05:30 committed by Dmitry Baryshkov
parent f028bcafb6
commit 3f17991488
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/msm/adreno/adreno_device.c
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@ -24,6 +24,10 @@ bool disable_acd;
MODULE_PARM_DESC(disable_acd, "Forcefully disable GPU ACD"); MODULE_PARM_DESC(disable_acd, "Forcefully disable GPU ACD");
module_param_unsafe(disable_acd, bool, 0400); module_param_unsafe(disable_acd, bool, 0400);
static bool skip_gpu;
MODULE_PARM_DESC(no_gpu, "Disable GPU driver register (0=enable GPU driver register (default), 1=skip GPU driver register");
module_param(skip_gpu, bool, 0400);
extern const struct adreno_gpulist a2xx_gpulist; extern const struct adreno_gpulist a2xx_gpulist;
extern const struct adreno_gpulist a3xx_gpulist; extern const struct adreno_gpulist a3xx_gpulist;
extern const struct adreno_gpulist a4xx_gpulist; extern const struct adreno_gpulist a4xx_gpulist;
@ -184,6 +188,9 @@ bool adreno_has_gpu(struct device_node *node)
uint32_t chip_id; uint32_t chip_id;
int ret; int ret;
if (skip_gpu)
return false;
ret = find_chipid(node, &chip_id); ret = find_chipid(node, &chip_id);
if (ret) if (ret)
return false; return false;
@ -404,10 +411,16 @@ static struct platform_driver adreno_driver = {
void __init adreno_register(void) void __init adreno_register(void)
{ {
if (skip_gpu)
return;
platform_driver_register(&adreno_driver); platform_driver_register(&adreno_driver);
} }
void __exit adreno_unregister(void) void __exit adreno_unregister(void)
{ {
if (skip_gpu)
return;
platform_driver_unregister(&adreno_driver); platform_driver_unregister(&adreno_driver);
} }