diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2095-drm-radeon-fix-atombios-on-big-endian.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2095-drm-radeon-fix-atombios-on-big-endian.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2095-drm-radeon-fix-atombios-on-big-endian.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2095-drm-radeon-fix-atombios-on-big-endian.patch new file mode 100644 index 00000000..701859c6 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2095-drm-radeon-fix-atombios-on-big-endian.patch @@ -0,0 +1,68 @@ +From 8c9d9211e241b97fa67d130436e7346bba28aeec Mon Sep 17 00:00:00 2001 +From: Roman Kapl <rka@sysgo.com> +Date: Mon, 30 Oct 2017 11:56:13 +0100 +Subject: [PATCH 2095/4131] drm/radeon: fix atombios on big endian + +The function for byteswapping the data send to/from atombios was buggy for +num_bytes not divisible by four. The function must be aware of the fact +that after byte-swapping the u32 units, valid bytes might end up after the +num_bytes boundary. + +This patch was tested on kernel 3.12 and allowed us to sucesfully use +DisplayPort on and Radeon SI card. Namely it fixed the link training and +EDID readout. + +The function is patched both in radeon and amd drivers, since the functions +and the fixes are identical. + +Signed-off-by: Roman Kapl <rka@sysgo.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +Cc: stable@vger.kernel.org +--- + drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 26 ++++++++++---------------- + 1 file changed, 10 insertions(+), 16 deletions(-) + +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c +index 31a96a3..1f32110 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c +@@ -1778,26 +1778,20 @@ bool amdgpu_atombios_scratch_need_asic_init(struct amdgpu_device *adev) + void amdgpu_atombios_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le) + { + #ifdef __BIG_ENDIAN +- u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */ +- u32 *dst32, *src32; ++ u32 src_tmp[5], dst_tmp[5]; + int i; ++ u8 align_num_bytes = ALIGN(num_bytes, 4); + +- memcpy(src_tmp, src, num_bytes); +- src32 = (u32 *)src_tmp; +- dst32 = (u32 *)dst_tmp; + if (to_le) { +- for (i = 0; i < ((num_bytes + 3) / 4); i++) +- dst32[i] = cpu_to_le32(src32[i]); +- memcpy(dst, dst_tmp, num_bytes); ++ memcpy(src_tmp, src, num_bytes); ++ for (i = 0; i < align_num_bytes / 4; i++) ++ dst_tmp[i] = cpu_to_le32(src_tmp[i]); ++ memcpy(dst, dst_tmp, align_num_bytes); + } else { +- u8 dws = num_bytes & ~3; +- for (i = 0; i < ((num_bytes + 3) / 4); i++) +- dst32[i] = le32_to_cpu(src32[i]); +- memcpy(dst, dst_tmp, dws); +- if (num_bytes % 4) { +- for (i = 0; i < (num_bytes % 4); i++) +- dst[dws+i] = dst_tmp[dws+i]; +- } ++ memcpy(src_tmp, src, align_num_bytes); ++ for (i = 0; i < align_num_bytes / 4; i++) ++ dst_tmp[i] = le32_to_cpu(src_tmp[i]); ++ memcpy(dst, dst_tmp, num_bytes); + } + #else + memcpy(dst, src, num_bytes); +-- +2.7.4 + |