hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

drm/radeon: fix endian bugs in hw i2c atom routines 

Need to swap the data fetched over i2c properly.  This
is the same fix as the endian fix for aux channel
transactions.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-08-07 19:34:53 -04:00
parent 1bd4cff651
commit 4543eda521
2 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/radeon/atombios_dp.c
View File

@ -50,7 +50,7 @@ static char *pre_emph_names[] = {
* or from atom. Note that atom operates on * or from atom. Note that atom operates on
* dw units. * dw units.
*/ */
static void radeon_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le) void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
{ {
#ifdef __BIG_ENDIAN #ifdef __BIG_ENDIAN
u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */ u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */
@ -100,7 +100,7 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1); base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
radeon_copy_swap(base, send, send_bytes, true); radeon_atom_copy_swap(base, send, send_bytes, true);
args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4)); args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4)); args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
@ -137,7 +137,7 @@ static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
recv_bytes = recv_size; recv_bytes = recv_size;
if (recv && recv_size) if (recv && recv_size)
radeon_copy_swap(recv, base + 16, recv_bytes, false); radeon_atom_copy_swap(recv, base + 16, recv_bytes, false);
return recv_bytes; return recv_bytes;
} }

4
drivers/gpu/drm/radeon/atombios_i2c.c
View File

@ -27,6 +27,8 @@
#include "radeon.h" #include "radeon.h"
#include "atom.h" #include "atom.h"
extern void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le);
#define TARGET_HW_I2C_CLOCK 50 #define TARGET_HW_I2C_CLOCK 50
/* these are a limitation of ProcessI2cChannelTransaction not the hw */ /* these are a limitation of ProcessI2cChannelTransaction not the hw */
@ -77,7 +79,7 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
} }
if (!(flags & HW_I2C_WRITE)) if (!(flags & HW_I2C_WRITE))
memcpy(buf, base, num); radeon_atom_copy_swap(buf, base, num, false);
return 0; return 0;
} }