From mboxrd@z Thu Jan 1 00:00:00 1970 From: allen Subject: [PATCH v4 2/4] Revert "drm/tegra: Move drm_dp_link helpers to Tegra DRM" Date: Fri, 15 Nov 2019 17:52:18 +0800 Message-ID: <1573811564-320-3-git-send-email-allen.chen@ite.com.tw> References: <1573811564-320-1-git-send-email-allen.chen@ite.com.tw> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1573811564-320-1-git-send-email-allen.chen@ite.com.tw> Sender: linux-kernel-owner@vger.kernel.org Cc: Allen Chen , Pi-Hsun Shih , Jau-Chih Tseng , Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Thierry Reding , Jonathan Hunter , open list , "open list:DRM DRIVERS" , "open list:DRM DRIVERS FOR NVIDIA TEGRA" List-Id: dri-devel@lists.freedesktop.org This reverts commit 9a42c7c647a9ad0f7ebb147a52eda3dcb7c84292. Signed-off-by: Allen Chen --- drivers/gpu/drm/drm_dp_helper.c | 128 ++++++ drivers/gpu/drm/tegra/Makefile | 1 - drivers/gpu/drm/tegra/dp.c | 876 ---------------------------------------- drivers/gpu/drm/tegra/dp.h | 177 -------- drivers/gpu/drm/tegra/dpaux.c | 1 - drivers/gpu/drm/tegra/sor.c | 1 - include/drm/drm_dp_helper.h | 16 + 7 files changed, 144 insertions(+), 1056 deletions(-) delete mode 100644 drivers/gpu/drm/tegra/dp.c delete mode 100644 drivers/gpu/drm/tegra/dp.h diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 2c7870a..f567141 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -352,6 +352,134 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, EXPORT_SYMBOL(drm_dp_dpcd_read_link_status); /** + * drm_dp_link_probe() - probe a DisplayPort link for capabilities + * @aux: DisplayPort AUX channel + * @link: pointer to structure in which to return link capabilities + * + * The structure filled in by this function can usually be passed directly + * into drm_dp_link_power_up() and drm_dp_link_configure() to power up and + * configure the link based on the link's capabilities. + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) +{ + u8 values[3]; + int err; + + memset(link, 0, sizeof(*link)); + + err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values)); + if (err < 0) + return err; + + link->revision = values[0]; + link->rate = drm_dp_bw_code_to_link_rate(values[1]); + link->num_lanes = values[2] & DP_MAX_LANE_COUNT_MASK; + + if (values[2] & DP_ENHANCED_FRAME_CAP) + link->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING; + + return 0; +} +EXPORT_SYMBOL(drm_dp_link_probe); + +/** + * drm_dp_link_power_up() - power up a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link) +{ + u8 value; + int err; + + /* DP_SET_POWER register is only available on DPCD v1.1 and later */ + if (link->revision < 0x11) + return 0; + + err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); + if (err < 0) + return err; + + value &= ~DP_SET_POWER_MASK; + value |= DP_SET_POWER_D0; + + err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + if (err < 0) + return err; + + /* + * According to the DP 1.1 specification, a "Sink Device must exit the + * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink + * Control Field" (register 0x600). + */ + usleep_range(1000, 2000); + + return 0; +} +EXPORT_SYMBOL(drm_dp_link_power_up); + +/** + * drm_dp_link_power_down() - power down a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link) +{ + u8 value; + int err; + + /* DP_SET_POWER register is only available on DPCD v1.1 and later */ + if (link->revision < 0x11) + return 0; + + err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); + if (err < 0) + return err; + + value &= ~DP_SET_POWER_MASK; + value |= DP_SET_POWER_D3; + + err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(drm_dp_link_power_down); + +/** + * drm_dp_link_configure() - configure a DisplayPort link + * @aux: DisplayPort AUX channel + * @link: pointer to a structure containing the link configuration + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) +{ + u8 values[2]; + int err; + + values[0] = drm_dp_link_rate_to_bw_code(link->rate); + values[1] = link->num_lanes; + + if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING) + values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + + err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(drm_dp_link_configure); + +/** * drm_dp_downstream_max_clock() - extract branch device max * pixel rate for legacy VGA * converter or max TMDS clock diff --git a/drivers/gpu/drm/tegra/Makefile b/drivers/gpu/drm/tegra/Makefile index d6cf202..33c463e 100644 --- a/drivers/gpu/drm/tegra/Makefile +++ b/drivers/gpu/drm/tegra/Makefile @@ -5,7 +5,6 @@ tegra-drm-y := \ drm.o \ gem.o \ fb.o \ - dp.o \ hub.o \ plane.o \ dc.o \ diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c deleted file mode 100644 index 70dfb7d..00000000 --- a/drivers/gpu/drm/tegra/dp.c +++ /dev/null @@ -1,876 +0,0 @@ -// SPDX-License-Identifier: MIT -/* - * Copyright (C) 2013-2019 NVIDIA Corporation - * Copyright (C) 2015 Rob Clark - */ - -#include -#include -#include - -#include "dp.h" - -static const u8 drm_dp_edp_revisions[] = { 0x11, 0x12, 0x13, 0x14 }; - -static void drm_dp_link_caps_reset(struct drm_dp_link_caps *caps) -{ - caps->enhanced_framing = false; - caps->tps3_supported = false; - caps->fast_training = false; - caps->channel_coding = false; - caps->alternate_scrambler_reset = false; -} - -void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest, - const struct drm_dp_link_caps *src) -{ - dest->enhanced_framing = src->enhanced_framing; - dest->tps3_supported = src->tps3_supported; - dest->fast_training = src->fast_training; - dest->channel_coding = src->channel_coding; - dest->alternate_scrambler_reset = src->alternate_scrambler_reset; -} - -static void drm_dp_link_reset(struct drm_dp_link *link) -{ - unsigned int i; - - if (!link) - return; - - link->revision = 0; - link->max_rate = 0; - link->max_lanes = 0; - - drm_dp_link_caps_reset(&link->caps); - link->aux_rd_interval.cr = 0; - link->aux_rd_interval.ce = 0; - link->edp = 0; - - link->rate = 0; - link->lanes = 0; - - for (i = 0; i < DP_MAX_SUPPORTED_RATES; i++) - link->rates[i] = 0; - - link->num_rates = 0; -} - -/** - * drm_dp_link_add_rate() - add a rate to the list of supported rates - * @link: the link to add the rate to - * @rate: the rate to add - * - * Add a link rate to the list of supported link rates. - * - * Returns: - * 0 on success or one of the following negative error codes on failure: - * - ENOSPC if the maximum number of supported rates has been reached - * - EEXISTS if the link already supports this rate - * - * See also: - * drm_dp_link_remove_rate() - */ -int drm_dp_link_add_rate(struct drm_dp_link *link, unsigned long rate) -{ - unsigned int i, pivot; - - if (link->num_rates == DP_MAX_SUPPORTED_RATES) - return -ENOSPC; - - for (pivot = 0; pivot < link->num_rates; pivot++) - if (rate <= link->rates[pivot]) - break; - - if (pivot != link->num_rates && rate == link->rates[pivot]) - return -EEXIST; - - for (i = link->num_rates; i > pivot; i--) - link->rates[i] = link->rates[i - 1]; - - link->rates[pivot] = rate; - link->num_rates++; - - return 0; -} - -/** - * drm_dp_link_remove_rate() - remove a rate from the list of supported rates - * @link: the link from which to remove the rate - * @rate: the rate to remove - * - * Removes a link rate from the list of supported link rates. - * - * Returns: - * 0 on success or one of the following negative error codes on failure: - * - EINVAL if the specified rate is not among the supported rates - * - * See also: - * drm_dp_link_add_rate() - */ -int drm_dp_link_remove_rate(struct drm_dp_link *link, unsigned long rate) -{ - unsigned int i; - - for (i = 0; i < link->num_rates; i++) - if (rate == link->rates[i]) - break; - - if (i == link->num_rates) - return -EINVAL; - - link->num_rates--; - - while (i < link->num_rates) { - link->rates[i] = link->rates[i + 1]; - i++; - } - - return 0; -} - -/** - * drm_dp_link_update_rates() - normalize the supported link rates array - * @link: the link for which to normalize the supported link rates - * - * Users should call this function after they've manually modified the array - * of supported link rates. This function removes any stale entries, compacts - * the array and updates the supported link rate count. Note that calling the - * drm_dp_link_remove_rate() function already does this janitorial work. - * - * See also: - * drm_dp_link_add_rate(), drm_dp_link_remove_rate() - */ -void drm_dp_link_update_rates(struct drm_dp_link *link) -{ - unsigned int i, count = 0; - - for (i = 0; i < link->num_rates; i++) { - if (link->rates[i] != 0) - link->rates[count++] = link->rates[i]; - } - - for (i = count; i < link->num_rates; i++) - link->rates[i] = 0; - - link->num_rates = count; -} - -/** - * drm_dp_link_probe() - probe a DisplayPort link for capabilities - * @aux: DisplayPort AUX channel - * @link: pointer to structure in which to return link capabilities - * - * The structure filled in by this function can usually be passed directly - * into drm_dp_link_power_up() and drm_dp_link_configure() to power up and - * configure the link based on the link's capabilities. - * - * Returns 0 on success or a negative error code on failure. - */ -int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) -{ - u8 dpcd[DP_RECEIVER_CAP_SIZE], value; - unsigned int rd_interval; - int err; - - drm_dp_link_reset(link); - - err = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, sizeof(dpcd)); - if (err < 0) - return err; - - link->revision = dpcd[DP_DPCD_REV]; - link->max_rate = drm_dp_max_link_rate(dpcd); - link->max_lanes = drm_dp_max_lane_count(dpcd); - - link->caps.enhanced_framing = drm_dp_enhanced_frame_cap(dpcd); - link->caps.tps3_supported = drm_dp_tps3_supported(dpcd); - link->caps.fast_training = drm_dp_fast_training_cap(dpcd); - link->caps.channel_coding = drm_dp_channel_coding_supported(dpcd); - - if (drm_dp_alternate_scrambler_reset_cap(dpcd)) { - link->caps.alternate_scrambler_reset = true; - - err = drm_dp_dpcd_readb(aux, DP_EDP_DPCD_REV, &value); - if (err < 0) - return err; - - if (value >= ARRAY_SIZE(drm_dp_edp_revisions)) - DRM_ERROR("unsupported eDP version: %02x\n", value); - else - link->edp = drm_dp_edp_revisions[value]; - } - - /* - * The DPCD stores the AUX read interval in units of 4 ms. There are - * two special cases: - * - * 1) if the TRAINING_AUX_RD_INTERVAL field is 0, the clock recovery - * and channel equalization should use 100 us or 400 us AUX read - * intervals, respectively - * - * 2) for DP v1.4 and above, clock recovery should always use 100 us - * AUX read intervals - */ - rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & - DP_TRAINING_AUX_RD_MASK; - - if (rd_interval > 4) { - DRM_DEBUG_KMS("AUX interval %u out of range (max. 4)\n", - rd_interval); - rd_interval = 4; - } - - rd_interval *= 4 * USEC_PER_MSEC; - - if (rd_interval == 0 || link->revision >= DP_DPCD_REV_14) - link->aux_rd_interval.cr = 100; - - if (rd_interval == 0) - link->aux_rd_interval.ce = 400; - - link->rate = link->max_rate; - link->lanes = link->max_lanes; - - /* Parse SUPPORTED_LINK_RATES from eDP 1.4 */ - if (link->edp >= 0x14) { - u8 supported_rates[DP_MAX_SUPPORTED_RATES * 2]; - unsigned int i; - u16 rate; - - err = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, - supported_rates, - sizeof(supported_rates)); - if (err < 0) - return err; - - for (i = 0; i < DP_MAX_SUPPORTED_RATES; i++) { - rate = supported_rates[i * 2 + 1] << 8 | - supported_rates[i * 2 + 0]; - - drm_dp_link_add_rate(link, rate * 200); - } - } - - return 0; -} - -/** - * drm_dp_link_power_up() - power up a DisplayPort link - * @aux: DisplayPort AUX channel - * @link: pointer to a structure containing the link configuration - * - * Returns 0 on success or a negative error code on failure. - */ -int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link) -{ - u8 value; - int err; - - /* DP_SET_POWER register is only available on DPCD v1.1 and later */ - if (link->revision < 0x11) - return 0; - - err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); - if (err < 0) - return err; - - value &= ~DP_SET_POWER_MASK; - value |= DP_SET_POWER_D0; - - err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); - if (err < 0) - return err; - - /* - * According to the DP 1.1 specification, a "Sink Device must exit the - * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink - * Control Field" (register 0x600). - */ - usleep_range(1000, 2000); - - return 0; -} - -/** - * drm_dp_link_power_down() - power down a DisplayPort link - * @aux: DisplayPort AUX channel - * @link: pointer to a structure containing the link configuration - * - * Returns 0 on success or a negative error code on failure. - */ -int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link) -{ - u8 value; - int err; - - /* DP_SET_POWER register is only available on DPCD v1.1 and later */ - if (link->revision < 0x11) - return 0; - - err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); - if (err < 0) - return err; - - value &= ~DP_SET_POWER_MASK; - value |= DP_SET_POWER_D3; - - err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); - if (err < 0) - return err; - - return 0; -} - -/** - * drm_dp_link_configure() - configure a DisplayPort link - * @aux: DisplayPort AUX channel - * @link: pointer to a structure containing the link configuration - * - * Returns 0 on success or a negative error code on failure. - */ -int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) -{ - u8 values[2], value; - int err; - - if (link->ops && link->ops->configure) { - err = link->ops->configure(link); - if (err < 0) { - DRM_ERROR("failed to configure DP link: %d\n", err); - return err; - } - } - - values[0] = drm_dp_link_rate_to_bw_code(link->rate); - values[1] = link->lanes; - - if (link->caps.enhanced_framing) - values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; - - err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values)); - if (err < 0) - return err; - - if (link->caps.channel_coding) - value = DP_SET_ANSI_8B10B; - else - value = 0; - - err = drm_dp_dpcd_writeb(aux, DP_MAIN_LINK_CHANNEL_CODING_SET, value); - if (err < 0) - return err; - - if (link->caps.alternate_scrambler_reset) { - err = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, - DP_ALTERNATE_SCRAMBLER_RESET_ENABLE); - if (err < 0) - return err; - } - - return 0; -} - -/** - * drm_dp_link_choose() - choose the lowest possible configuration for a mode - * @link: DRM DP link object - * @mode: DRM display mode - * @info: DRM display information - * - * According to the eDP specification, a source should select a configuration - * with the lowest number of lanes and the lowest possible link rate that can - * match the bitrate requirements of a video mode. However it must ensure not - * to exceed the capabilities of the sink. - * - * Returns: 0 on success or a negative error code on failure. - */ -int drm_dp_link_choose(struct drm_dp_link *link, - const struct drm_display_mode *mode, - const struct drm_display_info *info) -{ - /* available link symbol clock rates */ - static const unsigned int rates[3] = { 162000, 270000, 540000 }; - /* available number of lanes */ - static const unsigned int lanes[3] = { 1, 2, 4 }; - unsigned long requirement, capacity; - unsigned int rate = link->max_rate; - unsigned int i, j; - - /* bandwidth requirement */ - requirement = mode->clock * info->bpc * 3; - - for (i = 0; i < ARRAY_SIZE(lanes) && lanes[i] <= link->max_lanes; i++) { - for (j = 0; j < ARRAY_SIZE(rates) && rates[j] <= rate; j++) { - /* - * Capacity for this combination of lanes and rate, - * factoring in the ANSI 8B/10B encoding. - * - * Link rates in the DRM DP helpers are really link - * symbol frequencies, so a tenth of the actual rate - * of the link. - */ - capacity = lanes[i] * (rates[j] * 10) * 8 / 10; - - if (capacity >= requirement) { - DRM_DEBUG_KMS("using %u lanes at %u kHz (%lu/%lu kbps)\n", - lanes[i], rates[j], requirement, - capacity); - link->lanes = lanes[i]; - link->rate = rates[j]; - return 0; - } - } - } - - return -ERANGE; -} - -/** - * DOC: Link training - * - * These functions contain common logic and helpers to implement DisplayPort - * link training. - */ - -/** - * drm_dp_link_train_init() - initialize DisplayPort link training state - * @train: DisplayPort link training state - */ -void drm_dp_link_train_init(struct drm_dp_link_train *train) -{ - struct drm_dp_link_train_set *request = &train->request; - struct drm_dp_link_train_set *adjust = &train->adjust; - unsigned int i; - - for (i = 0; i < 4; i++) { - request->voltage_swing[i] = 0; - adjust->voltage_swing[i] = 0; - - request->pre_emphasis[i] = 0; - adjust->pre_emphasis[i] = 0; - - request->post_cursor[i] = 0; - adjust->post_cursor[i] = 0; - } - - train->pattern = DP_TRAINING_PATTERN_DISABLE; - train->clock_recovered = false; - train->channel_equalized = false; -} - -static bool drm_dp_link_train_valid(const struct drm_dp_link_train *train) -{ - return train->clock_recovered && train->channel_equalized; -} - -static int drm_dp_link_apply_training(struct drm_dp_link *link) -{ - struct drm_dp_link_train_set *request = &link->train.request; - unsigned int lanes = link->lanes, *vs, *pe, *pc, i; - struct drm_dp_aux *aux = link->aux; - u8 values[4], pattern = 0; - int err; - - err = link->ops->apply_training(link); - if (err < 0) { - DRM_ERROR("failed to apply link training: %d\n", err); - return err; - } - - vs = request->voltage_swing; - pe = request->pre_emphasis; - pc = request->post_cursor; - - /* write currently selected voltage-swing and pre-emphasis levels */ - for (i = 0; i < lanes; i++) - values[i] = DP_TRAIN_VOLTAGE_SWING_LEVEL(vs[i]) | - DP_TRAIN_PRE_EMPHASIS_LEVEL(pe[i]); - - err = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_SET, values, lanes); - if (err < 0) { - DRM_ERROR("failed to set training parameters: %d\n", err); - return err; - } - - /* write currently selected post-cursor level (if supported) */ - if (link->revision >= 0x12 && link->rate == 540000) { - values[0] = values[1] = 0; - - for (i = 0; i < lanes; i++) - values[i / 2] |= DP_LANE_POST_CURSOR(i, pc[i]); - - err = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_1_SET2, values, - DIV_ROUND_UP(lanes, 2)); - if (err < 0) { - DRM_ERROR("failed to set post-cursor: %d\n", err); - return err; - } - } - - /* write link pattern */ - if (link->train.pattern != DP_TRAINING_PATTERN_DISABLE) - pattern |= DP_LINK_SCRAMBLING_DISABLE; - - pattern |= link->train.pattern; - - err = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, pattern); - if (err < 0) { - DRM_ERROR("failed to set training pattern: %d\n", err); - return err; - } - - return 0; -} - -static void drm_dp_link_train_wait(struct drm_dp_link *link) -{ - unsigned long min = 0; - - switch (link->train.pattern) { - case DP_TRAINING_PATTERN_1: - min = link->aux_rd_interval.cr; - break; - - case DP_TRAINING_PATTERN_2: - case DP_TRAINING_PATTERN_3: - min = link->aux_rd_interval.ce; - break; - - default: - break; - } - - if (min > 0) - usleep_range(min, 2 * min); -} - -static void drm_dp_link_get_adjustments(struct drm_dp_link *link, - u8 status[DP_LINK_STATUS_SIZE]) -{ - struct drm_dp_link_train_set *adjust = &link->train.adjust; - unsigned int i; - - for (i = 0; i < link->lanes; i++) { - adjust->voltage_swing[i] = - drm_dp_get_adjust_request_voltage(status, i) >> - DP_TRAIN_VOLTAGE_SWING_SHIFT; - - adjust->pre_emphasis[i] = - drm_dp_get_adjust_request_pre_emphasis(status, i) >> - DP_TRAIN_PRE_EMPHASIS_SHIFT; - - adjust->post_cursor[i] = - drm_dp_get_adjust_request_post_cursor(status, i); - } -} - -static void drm_dp_link_train_adjust(struct drm_dp_link_train *train) -{ - struct drm_dp_link_train_set *request = &train->request; - struct drm_dp_link_train_set *adjust = &train->adjust; - unsigned int i; - - for (i = 0; i < 4; i++) - if (request->voltage_swing[i] != adjust->voltage_swing[i]) - request->voltage_swing[i] = adjust->voltage_swing[i]; - - for (i = 0; i < 4; i++) - if (request->pre_emphasis[i] != adjust->pre_emphasis[i]) - request->pre_emphasis[i] = adjust->pre_emphasis[i]; - - for (i = 0; i < 4; i++) - if (request->post_cursor[i] != adjust->post_cursor[i]) - request->post_cursor[i] = adjust->post_cursor[i]; -} - -static int drm_dp_link_recover_clock(struct drm_dp_link *link) -{ - u8 status[DP_LINK_STATUS_SIZE]; - int err; - - err = drm_dp_link_apply_training(link); - if (err < 0) - return err; - - drm_dp_link_train_wait(link); - - err = drm_dp_dpcd_read_link_status(link->aux, status); - if (err < 0) { - DRM_ERROR("failed to read link status: %d\n", err); - return err; - } - - if (!drm_dp_clock_recovery_ok(status, link->lanes)) - drm_dp_link_get_adjustments(link, status); - else - link->train.clock_recovered = true; - - return 0; -} - -static int drm_dp_link_clock_recovery(struct drm_dp_link *link) -{ - unsigned int repeat; - int err; - - /* start clock recovery using training pattern 1 */ - link->train.pattern = DP_TRAINING_PATTERN_1; - - for (repeat = 1; repeat < 5; repeat++) { - err = drm_dp_link_recover_clock(link); - if (err < 0) { - DRM_ERROR("failed to recover clock: %d\n", err); - return err; - } - - if (link->train.clock_recovered) - break; - - drm_dp_link_train_adjust(&link->train); - } - - return 0; -} - -static int drm_dp_link_equalize_channel(struct drm_dp_link *link) -{ - struct drm_dp_aux *aux = link->aux; - u8 status[DP_LINK_STATUS_SIZE]; - int err; - - err = drm_dp_link_apply_training(link); - if (err < 0) - return err; - - drm_dp_link_train_wait(link); - - err = drm_dp_dpcd_read_link_status(aux, status); - if (err < 0) { - DRM_ERROR("failed to read link status: %d\n", err); - return err; - } - - if (!drm_dp_clock_recovery_ok(status, link->lanes)) { - DRM_ERROR("clock recovery lost while equalizing channel\n"); - link->train.clock_recovered = false; - return 0; - } - - if (!drm_dp_channel_eq_ok(status, link->lanes)) - drm_dp_link_get_adjustments(link, status); - else - link->train.channel_equalized = true; - - return 0; -} - -static int drm_dp_link_channel_equalization(struct drm_dp_link *link) -{ - unsigned int repeat; - int err; - - /* start channel equalization using pattern 2 or 3 */ - if (link->caps.tps3_supported) - link->train.pattern = DP_TRAINING_PATTERN_3; - else - link->train.pattern = DP_TRAINING_PATTERN_2; - - for (repeat = 1; repeat < 5; repeat++) { - err = drm_dp_link_equalize_channel(link); - if (err < 0) { - DRM_ERROR("failed to equalize channel: %d\n", err); - return err; - } - - if (link->train.channel_equalized) - break; - - drm_dp_link_train_adjust(&link->train); - } - - return 0; -} - -static int drm_dp_link_downgrade(struct drm_dp_link *link) -{ - switch (link->rate) { - case 162000: - return -EINVAL; - - case 270000: - link->rate = 162000; - break; - - case 540000: - link->rate = 270000; - return 0; - } - - return 0; -} - -static void drm_dp_link_train_disable(struct drm_dp_link *link) -{ - int err; - - link->train.pattern = DP_TRAINING_PATTERN_DISABLE; - - err = drm_dp_link_apply_training(link); - if (err < 0) - DRM_ERROR("failed to disable link training: %d\n", err); -} - -static int drm_dp_link_train_full(struct drm_dp_link *link) -{ - int err; - -retry: - DRM_DEBUG_KMS("full-training link: %u lane%s at %u MHz\n", - link->lanes, (link->lanes > 1) ? "s" : "", - link->rate / 100); - - err = drm_dp_link_configure(link->aux, link); - if (err < 0) { - DRM_ERROR("failed to configure DP link: %d\n", err); - return err; - } - - err = drm_dp_link_clock_recovery(link); - if (err < 0) { - DRM_ERROR("clock recovery failed: %d\n", err); - goto out; - } - - if (!link->train.clock_recovered) { - DRM_ERROR("clock recovery failed, downgrading link\n"); - - err = drm_dp_link_downgrade(link); - if (err < 0) - goto out; - - goto retry; - } - - DRM_DEBUG_KMS("clock recovery succeeded\n"); - - err = drm_dp_link_channel_equalization(link); - if (err < 0) { - DRM_ERROR("channel equalization failed: %d\n", err); - goto out; - } - - if (!link->train.channel_equalized) { - DRM_ERROR("channel equalization failed, downgrading link\n"); - - err = drm_dp_link_downgrade(link); - if (err < 0) - goto out; - - goto retry; - } - - DRM_DEBUG_KMS("channel equalization succeeded\n"); - -out: - drm_dp_link_train_disable(link); - return err; -} - -static int drm_dp_link_train_fast(struct drm_dp_link *link) -{ - u8 status[DP_LINK_STATUS_SIZE]; - int err; - - DRM_DEBUG_KMS("fast-training link: %u lane%s at %u MHz\n", - link->lanes, (link->lanes > 1) ? "s" : "", - link->rate / 100); - - err = drm_dp_link_configure(link->aux, link); - if (err < 0) { - DRM_ERROR("failed to configure DP link: %d\n", err); - return err; - } - - /* transmit training pattern 1 for 500 microseconds */ - link->train.pattern = DP_TRAINING_PATTERN_1; - - err = drm_dp_link_apply_training(link); - if (err < 0) - goto out; - - usleep_range(500, 1000); - - /* transmit training pattern 2 or 3 for 500 microseconds */ - if (link->caps.tps3_supported) - link->train.pattern = DP_TRAINING_PATTERN_3; - else - link->train.pattern = DP_TRAINING_PATTERN_2; - - err = drm_dp_link_apply_training(link); - if (err < 0) - goto out; - - usleep_range(500, 1000); - - err = drm_dp_dpcd_read_link_status(link->aux, status); - if (err < 0) { - DRM_ERROR("failed to read link status: %d\n", err); - goto out; - } - - if (!drm_dp_clock_recovery_ok(status, link->lanes)) { - DRM_ERROR("clock recovery failed\n"); - err = -EIO; - } - - if (!drm_dp_channel_eq_ok(status, link->lanes)) { - DRM_ERROR("channel equalization failed\n"); - err = -EIO; - } - -out: - drm_dp_link_train_disable(link); - return err; -} - -/** - * drm_dp_link_train() - perform DisplayPort link training - * @link: a DP link object - * - * Uses the context stored in the DP link object to perform link training. It - * is expected that drivers will call drm_dp_link_probe() to obtain the link - * capabilities before performing link training. - * - * If the sink supports fast link training (no AUX CH handshake) and valid - * training settings are available, this function will try to perform fast - * link training and fall back to full link training on failure. - * - * Returns: 0 on success or a negative error code on failure. - */ -int drm_dp_link_train(struct drm_dp_link *link) -{ - int err; - - drm_dp_link_train_init(&link->train); - - if (link->caps.fast_training) { - if (drm_dp_link_train_valid(&link->train)) { - err = drm_dp_link_train_fast(link); - if (err < 0) - DRM_ERROR("fast link training failed: %d\n", - err); - else - return 0; - } else { - DRM_DEBUG_KMS("training parameters not available\n"); - } - } else { - DRM_DEBUG_KMS("fast link training not supported\n"); - } - - err = drm_dp_link_train_full(link); - if (err < 0) - DRM_ERROR("full link training failed: %d\n", err); - - return err; -} diff --git a/drivers/gpu/drm/tegra/dp.h b/drivers/gpu/drm/tegra/dp.h deleted file mode 100644 index cb12ed0..00000000 --- a/drivers/gpu/drm/tegra/dp.h +++ /dev/null @@ -1,177 +0,0 @@ -/* SPDX-License-Identifier: MIT */ -/* - * Copyright (C) 2013-2019 NVIDIA Corporation. - * Copyright (C) 2015 Rob Clark - */ - -#ifndef DRM_TEGRA_DP_H -#define DRM_TEGRA_DP_H 1 - -#include - -struct drm_display_info; -struct drm_display_mode; -struct drm_dp_aux; -struct drm_dp_link; - -/** - * struct drm_dp_link_caps - DP link capabilities - */ -struct drm_dp_link_caps { - /** - * @enhanced_framing: - * - * enhanced framing capability (mandatory as of DP 1.2) - */ - bool enhanced_framing; - - /** - * tps3_supported: - * - * training pattern sequence 3 supported for equalization - */ - bool tps3_supported; - - /** - * @fast_training: - * - * AUX CH handshake not required for link training - */ - bool fast_training; - - /** - * @channel_coding: - * - * ANSI 8B/10B channel coding capability - */ - bool channel_coding; - - /** - * @alternate_scrambler_reset: - * - * eDP alternate scrambler reset capability - */ - bool alternate_scrambler_reset; -}; - -void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest, - const struct drm_dp_link_caps *src); - -/** - * struct drm_dp_link_ops - DP link operations - */ -struct drm_dp_link_ops { - /** - * @apply_training: - */ - int (*apply_training)(struct drm_dp_link *link); - - /** - * @configure: - */ - int (*configure)(struct drm_dp_link *link); -}; - -#define DP_TRAIN_VOLTAGE_SWING_LEVEL(x) ((x) << 0) -#define DP_TRAIN_PRE_EMPHASIS_LEVEL(x) ((x) << 3) -#define DP_LANE_POST_CURSOR(i, x) (((x) & 0x3) << (((i) & 1) << 2)) - -/** - * struct drm_dp_link_train_set - link training settings - * @voltage_swing: per-lane voltage swing - * @pre_emphasis: per-lane pre-emphasis - * @post_cursor: per-lane post-cursor - */ -struct drm_dp_link_train_set { - unsigned int voltage_swing[4]; - unsigned int pre_emphasis[4]; - unsigned int post_cursor[4]; -}; - -/** - * struct drm_dp_link_train - link training state information - * @request: currently requested settings - * @adjust: adjustments requested by sink - * @pattern: currently requested training pattern - * @clock_recovered: flag to track if clock recovery has completed - * @channel_equalized: flag to track if channel equalization has completed - */ -struct drm_dp_link_train { - struct drm_dp_link_train_set request; - struct drm_dp_link_train_set adjust; - - unsigned int pattern; - - bool clock_recovered; - bool channel_equalized; -}; - -/** - * struct drm_dp_link - DP link capabilities and configuration - * @revision: DP specification revision supported on the link - * @max_rate: maximum clock rate supported on the link - * @max_lanes: maximum number of lanes supported on the link - * @caps: capabilities supported on the link (see &drm_dp_link_caps) - * @aux_rd_interval: AUX read interval to use for training (in microseconds) - * @edp: eDP revision (0x11: eDP 1.1, 0x12: eDP 1.2, ...) - * @rate: currently configured link rate - * @lanes: currently configured number of lanes - * @rates: additional supported link rates in kHz (eDP 1.4) - * @num_rates: number of additional supported link rates (eDP 1.4) - */ -struct drm_dp_link { - unsigned char revision; - unsigned int max_rate; - unsigned int max_lanes; - - struct drm_dp_link_caps caps; - - /** - * @cr: clock recovery read interval - * @ce: channel equalization read interval - */ - struct { - unsigned int cr; - unsigned int ce; - } aux_rd_interval; - - unsigned char edp; - - unsigned int rate; - unsigned int lanes; - - unsigned long rates[DP_MAX_SUPPORTED_RATES]; - unsigned int num_rates; - - /** - * @ops: DP link operations - */ - const struct drm_dp_link_ops *ops; - - /** - * @aux: DP AUX channel - */ - struct drm_dp_aux *aux; - - /** - * @train: DP link training state - */ - struct drm_dp_link_train train; -}; - -int drm_dp_link_add_rate(struct drm_dp_link *link, unsigned long rate); -int drm_dp_link_remove_rate(struct drm_dp_link *link, unsigned long rate); -void drm_dp_link_update_rates(struct drm_dp_link *link); - -int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link); -int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link); -int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link); -int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link); -int drm_dp_link_choose(struct drm_dp_link *link, - const struct drm_display_mode *mode, - const struct drm_display_info *info); - -void drm_dp_link_train_init(struct drm_dp_link_train *train); -int drm_dp_link_train(struct drm_dp_link *link); - -#endif diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c index 622cdf1..066177a 100644 --- a/drivers/gpu/drm/tegra/dpaux.c +++ b/drivers/gpu/drm/tegra/dpaux.c @@ -23,7 +23,6 @@ #include #include -#include "dp.h" #include "dpaux.h" #include "drm.h" #include "trace.h" diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c index 615cb31..29c3ae8 100644 --- a/drivers/gpu/drm/tegra/sor.c +++ b/drivers/gpu/drm/tegra/sor.c @@ -25,7 +25,6 @@ #include #include "dc.h" -#include "dp.h" #include "drm.h" #include "hda.h" #include "sor.h" diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 51ecb51..04f6c0b 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1455,6 +1455,22 @@ static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]); +/* + * DisplayPort link + */ +#define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0) + +struct drm_dp_link { + unsigned char revision; + unsigned int rate; + unsigned int num_lanes; + unsigned long capabilities; +}; + +int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link); +int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link); +int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link); +int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link); int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22D13C432C3 for ; Fri, 15 Nov 2019 10:23:29 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher 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by mse.ite.com.tw with ESMTP id xAFA4xso031841; Fri, 15 Nov 2019 18:04:59 +0800 (GMT-8) (envelope-from allen.chen@ite.com.tw) Received: from allen-VirtualBox.internal.ite.com.tw (192.168.70.14) by csbcas1.internal.ite.com.tw (192.168.65.45) with Microsoft SMTP Server (TLS) id 14.3.352.0; Fri, 15 Nov 2019 18:05:00 +0800 From: allen To: Subject: [PATCH v4 2/4] Revert "drm/tegra: Move drm_dp_link helpers to Tegra DRM" Date: Fri, 15 Nov 2019 17:52:18 +0800 Message-ID: <1573811564-320-3-git-send-email-allen.chen@ite.com.tw> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1573811564-320-1-git-send-email-allen.chen@ite.com.tw> References: <1573811564-320-1-git-send-email-allen.chen@ite.com.tw> MIME-Version: 1.0 X-Originating-IP: [192.168.70.14] X-MAIL: mse.ite.com.tw xAFA4xso031841 X-Mailman-Approved-At: Fri, 15 Nov 2019 10:23:15 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jau-Chih Tseng , David Airlie , Allen Chen , open list , Jonathan Hunter , Thierry Reding , "open list:DRM DRIVERS" , Pi-Hsun Shih , "open list:DRM DRIVERS FOR NVIDIA TEGRA" , Sean Paul Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191115095218.Ed9H4UxF-xCHTYYHriNES7WcBjUK_Gflr-XYcmWTP60@z> VGhpcyByZXZlcnRzIGNvbW1pdCA5YTQyYzdjNjQ3YTlhZDBmN2ViYjE0N2E1MmVkYTNkY2I3Yzg0 MjkyLgoKU2lnbmVkLW9mZi1ieTogQWxsZW4gQ2hlbiA8YWxsZW4uY2hlbkBpdGUuY29tLnR3Pgot LS0KIGRyaXZlcnMvZ3B1L2RybS9kcm1fZHBfaGVscGVyLmMgfCAxMjggKysrKysrCiBkcml2ZXJz L2dwdS9kcm0vdGVncmEvTWFrZWZpbGUgIHwgICAxIC0KIGRyaXZlcnMvZ3B1L2RybS90ZWdyYS9k cC5jICAgICAgfCA4NzYgLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQog ZHJpdmVycy9ncHUvZHJtL3RlZ3JhL2RwLmggICAgICB8IDE3NyAtLS0tLS0tLQogZHJpdmVycy9n 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