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authorAlex Deucher2013-08-07 19:34:53 -0400
committerAlex Deucher2013-08-30 16:30:38 -0400
commit4543eda52113d1e2cc0e9bf416f79597e6ef1ec7 (patch)
tree16ea2493eb505eaedd2c933348a1440d5e82aa7d
parent1bd4cff651350380f9fb6847313cb78e84c03846 (diff)
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
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c6
-rw-r--r--drivers/gpu/drm/radeon/atombios_i2c.c4
2 files changed, 6 insertions, 4 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 32501f6ec991..16023986d301 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -50,7 +50,7 @@ static char *pre_emph_names[] = {
* or from atom. Note that atom operates on
* 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
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);
- 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.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;
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;
}
diff --git a/drivers/gpu/drm/radeon/atombios_i2c.c b/drivers/gpu/drm/radeon/atombios_i2c.c
index 082338df708a..2ca389d19258 100644
--- a/drivers/gpu/drm/radeon/atombios_i2c.c
+++ b/drivers/gpu/drm/radeon/atombios_i2c.c
@@ -27,6 +27,8 @@
#include "radeon.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
/* 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))
- memcpy(buf, base, num);
+ radeon_atom_copy_swap(buf, base, num, false);
return 0;
}