From: Huacai Chen Date: Wed, 24 Jan 2024 10:16:07 +0000 (+0800) Subject: drm/loongson: Error out if no VRAM detected X-Git-Tag: v6.9-rc1~126^2~23^2~49 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cc575083cdcf8127f5e260915f5af443602a7763;p=thirdparty%2Fkernel%2Flinux.git drm/loongson: Error out if no VRAM detected When a Loongson laptop is equipped with a Radeon GPU, it can be true that there is no dedicated VRAM soldered on the motherboard. This is probably for cost reason, but drm/loongson driver is probed because the platform BIOS (either UEFI or PMON) forget to disable the integrated GPU. So in the lsdc_get_dedicated_vram() function, we error out if no dedicated VRAM detected. This fix nothing, but serve as a sanity check only. Tested-by: Xiaotian Wu Signed-off-by: Huacai Chen Reviewed-by: Sui Jingfeng Signed-off-by: Sui Jingfeng Link: https://patchwork.freedesktop.org/patch/msgid/20240124101607.2910998-1-chenhuacai@loongson.cn --- diff --git a/drivers/gpu/drm/loongson/lsdc_drv.c b/drivers/gpu/drm/loongson/lsdc_drv.c index 89ccc0c431690..d8ff60b46abe6 100644 --- a/drivers/gpu/drm/loongson/lsdc_drv.c +++ b/drivers/gpu/drm/loongson/lsdc_drv.c @@ -184,7 +184,7 @@ static int lsdc_get_dedicated_vram(struct lsdc_device *ldev, drm_info(ddev, "Dedicated vram start: 0x%llx, size: %uMiB\n", (u64)base, (u32)(size >> 20)); - return 0; + return (size > SZ_1M) ? 0 : -ENODEV; } static struct lsdc_device *