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drm: extract dp link bw helpers

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Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-10-18 10:15:31 +02:00
parent a7c9655fdd
commit 3b5c662e8f
4 changed files with 40 additions and 33 deletions
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28
drivers/gpu/drm/drm_dp_helper.c
View file

@ -297,3 +297,31 @@ void drm_dp_link_train_channel_eq_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]) {
mdelay(dpcd[DP_TRAINING_AUX_RD_INTERVAL] * 4);
}
EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay);
u8 drm_dp_link_rate_to_bw_code(int link_rate)
{
switch (link_rate) {
case 162000:
default:
return DP_LINK_BW_1_62;
case 270000:
return DP_LINK_BW_2_7;
case 540000:
return DP_LINK_BW_5_4;
}
}
EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
int drm_dp_bw_code_to_link_rate(u8 link_bw)
{
switch (link_bw) {
case DP_LINK_BW_1_62:
default:
return 162000;
case DP_LINK_BW_2_7:
return 270000;
case DP_LINK_BW_5_4:
return 540000;
}
}
EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);

5
drivers/gpu/drm/i915/intel_dp.c
View file

@ -108,10 +108,7 @@ intel_edp_link_config(struct intel_encoder *intel_encoder,
struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
*lane_num = intel_dp->lane_count;
if (intel_dp->link_bw == DP_LINK_BW_1_62)
*link_bw = 162000;
else if (intel_dp->link_bw == DP_LINK_BW_2_7)
*link_bw = 270000;
*link_bw = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
}
int

32
drivers/gpu/drm/radeon/atombios_dp.c
View file

@ -347,37 +347,11 @@ static int dp_get_max_dp_pix_clock(int link_rate,
return (link_rate * lane_num * 8) / bpp;
}
static int dp_get_max_link_rate(u8 dpcd[DP_DPCD_SIZE])
{
switch (dpcd[DP_MAX_LINK_RATE]) {
case DP_LINK_BW_1_62:
default:
return 162000;
case DP_LINK_BW_2_7:
return 270000;
case DP_LINK_BW_5_4:
return 540000;
}
}
static u8 dp_get_max_lane_number(u8 dpcd[DP_DPCD_SIZE])
{
return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
}
static u8 dp_get_dp_link_rate_coded(int link_rate)
{
switch (link_rate) {
case 162000:
default:
return DP_LINK_BW_1_62;
case 270000:
return DP_LINK_BW_2_7;
case 540000:
return DP_LINK_BW_5_4;
}
}
/***** radeon specific DP functions *****/
/* First get the min lane# when low rate is used according to pixel clock
@ -389,7 +363,7 @@ static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
int pix_clock)
{
int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
int max_link_rate = dp_get_max_link_rate(dpcd);
int max_link_rate = drm_dp_max_link_rate(dpcd);
int max_lane_num = dp_get_max_lane_number(dpcd);
int lane_num;
int max_dp_pix_clock;
@ -427,7 +401,7 @@ static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
return 540000;
}
return dp_get_max_link_rate(dpcd);
return drm_dp_max_link_rate(dpcd);
}
static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
@ -692,7 +666,7 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
/* set the link rate on the sink */
tmp = dp_get_dp_link_rate_coded(dp_info->dp_clock);
tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock);
radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LINK_BW_SET, tmp);
/* start training on the source */

8
include/drm/drm_dp_helper.h
View file

@ -338,4 +338,12 @@ u8 drm_dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
void drm_dp_link_train_clock_recovery_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);
void drm_dp_link_train_channel_eq_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);
u8 drm_dp_link_rate_to_bw_code(int link_rate);
int drm_dp_bw_code_to_link_rate(u8 link_bw);
static inline int
drm_dp_max_link_rate(u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
}
#endif /* _DRM_DP_HELPER_H_ */