This is a note to let you know that I've just added the patch titled
drm/radeon: fix endian issues with DP handling (v3)
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-fix-endian-issues-with-dp-handling-v3.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 34be8c9af7b8728465963740fc11136ae90dfc36 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 18 Jul 2013 11:13:53 -0400
Subject: drm/radeon: fix endian issues with DP handling (v3)
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 34be8c9af7b8728465963740fc11136ae90dfc36 upstream.
The atom interpreter expects data in LE format, so
swap the message buffer as apprioriate.
v2: properly handle non-dw aligned byte counts.
v3: properly handle remainder
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Dong He <hedonghust@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/atombios_dp.c | 43 +++++++++++++++++++++++++++++++----
1 file changed, 39 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -45,6 +45,41 @@ static char *pre_emph_names[] = {
};
/***** radeon AUX functions *****/
+
+/* Atom needs data in little endian format
+ * so swap as appropriate when copying data to
+ * 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)
+{
+#ifdef __BIG_ENDIAN
+ u8 src_tmp[20], dst_tmp[20]; /* used for byteswapping */
+ u32 *dst32, *src32;
+ int i;
+
+ 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);
+ } 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];
+ }
+ }
+#else
+ memcpy(dst, src, num_bytes);
+#endif
+}
+
union aux_channel_transaction {
PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
@@ -66,10 +101,10 @@ static int radeon_process_aux_ch(struct
base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1);
- memcpy(base, send, send_bytes);
+ radeon_copy_swap(base, send, send_bytes, true);
- args.v1.lpAuxRequest = 0 + 4;
- args.v1.lpDataOut = 16 + 4;
+ args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4));
+ args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4));
args.v1.ucDataOutLen = 0;
args.v1.ucChannelID = chan->rec.i2c_id;
args.v1.ucDelay = delay / 10;
@@ -103,7 +138,7 @@ static int radeon_process_aux_ch(struct
recv_bytes = recv_size;
if (recv && recv_size)
- memcpy(recv, base + 16, recv_bytes);
+ radeon_copy_swap(recv, base + 16, recv_bytes, false);
return recv_bytes;
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.4/drm-radeon-fix-combios-tables-on-older-cards.patch
queue-3.4/drm-radeon-fix-endian-issues-with-dp-handling-v3.patch
queue-3.4/drm-radeon-improve-dac-adjust-heuristics-for-legacy-pdac.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html