From: Daniel Vetter Date: Thu, 18 Oct 2012 08:15:24 +0000 (+0200) Subject: drm: dp helper: extract drm_dp_channel_eq_ok X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1ffdff134eb2d943bde3e4901ac48a9656a7e7a5;p=linux-beck.git drm: dp helper: extract drm_dp_channel_eq_ok radeon and intel use the exact same definition. Reviewed-by: Alex Deucher Acked-by: Dave Airlie Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index bb4eaf60117f..1378b789bd10 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -205,3 +205,53 @@ i2c_dp_aux_add_bus(struct i2c_adapter *adapter) return error; } EXPORT_SYMBOL(i2c_dp_aux_add_bus); + +/* Helpers for DP link training */ +static u8 dp_link_status(u8 link_status[DP_LINK_STATUS_SIZE], int r) +{ + return link_status[r - DP_LANE0_1_STATUS]; +} + +static u8 dp_get_lane_status(u8 link_status[DP_LINK_STATUS_SIZE], + int lane) +{ + int i = DP_LANE0_1_STATUS + (lane >> 1); + int s = (lane & 1) * 4; + u8 l = dp_link_status(link_status, i); + return (l >> s) & 0xf; +} + +bool drm_dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE], + int lane_count) +{ + u8 lane_align; + u8 lane_status; + int lane; + + lane_align = dp_link_status(link_status, + DP_LANE_ALIGN_STATUS_UPDATED); + if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0) + return false; + for (lane = 0; lane < lane_count; lane++) { + lane_status = dp_get_lane_status(link_status, lane); + if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS) + return false; + } + return true; +} +EXPORT_SYMBOL(drm_dp_channel_eq_ok); + +bool drm_dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE], + int lane_count) +{ + int lane; + u8 lane_status; + + for (lane = 0; lane < lane_count; lane++) { + lane_status = dp_get_lane_status(link_status, lane); + if ((lane_status & DP_LANE_CR_DONE) == 0) + return false; + } + return true; +} +EXPORT_SYMBOL(drm_dp_clock_recovery_ok); diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 38305c93754c..f69044b7f008 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -37,7 +37,6 @@ #include "i915_drv.h" #define DP_RECEIVER_CAP_SIZE 0xf -#define DP_LINK_STATUS_SIZE 6 #define DP_LINK_CHECK_TIMEOUT (10 * 1000) /** @@ -1436,13 +1435,6 @@ intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_ DP_LINK_STATUS_SIZE); } -static uint8_t -intel_dp_link_status(uint8_t link_status[DP_LINK_STATUS_SIZE], - int r) -{ - return link_status[r - DP_LANE0_1_STATUS]; -} - static uint8_t intel_get_adjust_request_voltage(uint8_t adjust_request[2], int lane) @@ -1728,29 +1720,6 @@ intel_clock_recovery_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count return true; } -/* Check to see if channel eq is done on all channels */ -#define CHANNEL_EQ_BITS (DP_LANE_CR_DONE|\ - DP_LANE_CHANNEL_EQ_DONE|\ - DP_LANE_SYMBOL_LOCKED) -static bool -intel_channel_eq_ok(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]) -{ - uint8_t lane_align; - uint8_t lane_status; - int lane; - - lane_align = intel_dp_link_status(link_status, - DP_LANE_ALIGN_STATUS_UPDATED); - if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0) - return false; - for (lane = 0; lane < intel_dp->lane_count; lane++) { - lane_status = intel_get_lane_status(link_status, lane); - if ((lane_status & CHANNEL_EQ_BITS) != CHANNEL_EQ_BITS) - return false; - } - return true; -} - static bool intel_dp_set_link_train(struct intel_dp *intel_dp, uint32_t dp_reg_value, @@ -2004,7 +1973,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp) continue; } - if (intel_channel_eq_ok(intel_dp, link_status)) { + if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { channel_eq = true; break; } @@ -2223,7 +2192,7 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n"); } - if (!intel_channel_eq_ok(intel_dp, link_status)) { + if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n", drm_get_encoder_name(&intel_dp->base.base)); intel_dp_start_link_train(intel_dp); diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index d5699fe4f1e8..3f46bb1bb987 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -34,7 +34,6 @@ /* move these to drm_dp_helper.c/h */ #define DP_LINK_CONFIGURATION_SIZE 9 -#define DP_LINK_STATUS_SIZE 6 #define DP_DPCD_SIZE 8 static char *voltage_names[] = { @@ -318,25 +317,6 @@ static bool dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE], return true; } -static bool dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE], - int lane_count) -{ - u8 lane_align; - u8 lane_status; - int lane; - - lane_align = dp_link_status(link_status, - DP_LANE_ALIGN_STATUS_UPDATED); - if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0) - return false; - for (lane = 0; lane < lane_count; lane++) { - lane_status = dp_get_lane_status(link_status, lane); - if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS) - return false; - } - return true; -} - static u8 dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], int lane) @@ -664,7 +644,7 @@ bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector) if (!radeon_dp_get_link_status(radeon_connector, link_status)) return false; - if (dp_channel_eq_ok(link_status, dig->dp_lane_count)) + if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count)) return false; return true; } @@ -896,7 +876,7 @@ static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info) break; } - if (dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { + if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { channel_eq = true; break; } diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index fe061489f91f..9e1042073f67 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -322,4 +322,9 @@ struct i2c_algo_dp_aux_data { int i2c_dp_aux_add_bus(struct i2c_adapter *adapter); + +#define DP_LINK_STATUS_SIZE 6 +bool drm_dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE], + int lane_count); + #endif /* _DRM_DP_HELPER_H_ */