p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

drm/dp: Add definitions for TPS4 bits and macros to check the support 

DP 1.4 spec adds a TPS4 training pattern sequence required for
HBR3. This patch adds the corresponding bit definitions in
MAX_DOWNSPREAD register and TRAINING_PATTERN_SET and
inline functions to check if this bit is set and for selecting
a proper TRAINING_PATTERN_MASK that changed to 0x7 on
DP spec 1.4

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1516660991-20697-2-git-send-email-manasi.d.navare@intel.com
This commit is contained in:
Manasi Navare 2018-01-22 14:43:11 -08:00 committed by Jani Nikula
parent e0bd878a95
commit 41d2f5fa89
1 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/drm/drm_dp_helper.h
View File

@ -75,6 +75,7 @@
#define DP_MAX_DOWNSPREAD 0x003
# define DP_MAX_DOWNSPREAD_0_5 (1 << 0)
# define DP_NO_AUX_HANDSHAKE_LINK_TRAINING (1 << 6)
# define DP_TPS4_SUPPORTED (1 << 7)
#define DP_NORP 0x004
@ -345,7 +346,9 @@
# define DP_TRAINING_PATTERN_1 1
# define DP_TRAINING_PATTERN_2 2
# define DP_TRAINING_PATTERN_3 3 /* 1.2 */
# define DP_TRAINING_PATTERN_4 7 /* 1.4 */
# define DP_TRAINING_PATTERN_MASK 0x3
# define DP_TRAINING_PATTERN_MASK_1_4 0xf
/* DPCD 1.1 only. For DPCD >= 1.2 see per-lane DP_LINK_QUAL_LANEn_SET */
# define DP_LINK_QUAL_PATTERN_11_DISABLE (0 << 2)
@ -971,6 +974,20 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
}
static inline bool
drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return dpcd[DP_DPCD_REV] >= 0x14 &&
dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED;
}
static inline u8
drm_dp_training_pattern_mask(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return (dpcd[DP_DPCD_REV] >= 0x14) ? DP_TRAINING_PATTERN_MASK_1_4 :
DP_TRAINING_PATTERN_MASK;
}
static inline bool
drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{