| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250210144959.100551-6-shiyongbang@huawei.com>
Date: Mon, 10 Feb 2025 22:49:57 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
<kong.kongxinwei@...ilicon.com>
CC: <liangjian010@...wei.com>, <chenjianmin@...wei.com>,
<lidongming5@...wei.com>, <shiyongbang@...wei.com>, <libaihan@...wei.com>,
<shenjian15@...wei.com>, <shaojijie@...wei.com>,
<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 drm-dp 5/7] drm/hisilicon/hibmc: Get link status and dpcd caps
From: Baihan Li <libaihan@...wei.com>
Prepare the hibmc_dp_get_foo() functions for debugfs using in
next patch. We also add dpcd's if statement in link training process,
because we have the dpcd.
Signed-off-by: Baihan Li <libaihan@...wei.com>
Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
---
drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h | 3 ++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c | 15 ++++++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h | 3 ++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c | 39 ++++++++++++++++----
4 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
index d613da8b544c..8eb1659c7685 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
@@ -26,6 +26,9 @@ struct hibmc_link_status {
struct hibmc_link_cap {
u8 link_rate;
u8 lanes;
+ int rx_dpcd_revision;
+ bool is_tps3;
+ bool is_tps4;
};
struct hibmc_dp_link {
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
index 8adace0befde..5e889c377117 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
@@ -227,6 +227,21 @@ int hibmc_dp_mode_set(struct hibmc_dp *dp, struct drm_display_mode *mode)
return 0;
}
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.link_rate;
+}
+
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.lanes;
+}
+
+int hibmc_dp_get_dpcd(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.rx_dpcd_revision;
+}
+
static const struct hibmc_dp_color_raw g_rgb_raw[] = {
{CBAR_COLOR_BAR, 0x000, 0x000, 0x000},
{CBAR_WHITE, 0xfff, 0xfff, 0xfff},
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
index 621a0a1d7eb7..823544b8008b 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
@@ -54,6 +54,9 @@ struct hibmc_dp {
int hibmc_dp_hw_init(struct hibmc_dp *dp);
int hibmc_dp_mode_set(struct hibmc_dp *dp, struct drm_display_mode *mode);
void hibmc_dp_display_en(struct hibmc_dp *dp, bool enable);
+int hibmc_dp_get_dpcd(struct hibmc_dp *dp);
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp);
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp);
void hibmc_dp_set_cbar(struct hibmc_dp *dp, const struct hibmc_dp_cbar_cfg *cfg);
#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
index 4a99a9b7e3c4..39345fc78c06 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
@@ -7,6 +7,7 @@
#include "dp_comm.h"
#include "dp_reg.h"
#include "dp_serdes.h"
+#include "dp_config.h"
#define HIBMC_EQ_MAX_RETRY 5
@@ -42,11 +43,7 @@ static int hibmc_dp_link_training_configure(struct hibmc_dp_dev *dp)
return ret >= 0 ? -EIO : ret;
}
- ret = drm_dp_read_dpcd_caps(dp->aux, dp->dpcd);
- if (ret)
- drm_err(dp->dev, "dp aux read dpcd failed, ret: %d\n", ret);
-
- return ret;
+ return 0;
}
static int hibmc_dp_link_set_pattern(struct hibmc_dp_dev *dp, int pattern)
@@ -189,15 +186,17 @@ static int hibmc_dp_link_training_cr(struct hibmc_dp_dev *dp)
bool level_changed;
u32 voltage_tries;
u32 cr_tries;
+ u32 max_cr;
int ret;
/*
* DP 1.4 spec define 10 for maxtries value, for pre DP 1.4 version set a limit of 80
* (4 voltage levels x 4 preemphasis levels x 5 identical voltage retries)
*/
+ max_cr = dp->link.cap.rx_dpcd_revision >= DP_DPCD_REV_14 ? 10 : 80;
voltage_tries = 1;
- for (cr_tries = 0; cr_tries < 80; cr_tries++) {
+ for (cr_tries = 0; cr_tries < max_cr; cr_tries++) {
drm_dp_link_train_clock_recovery_delay(dp->aux, dp->dpcd);
ret = drm_dp_dpcd_read_link_status(dp->aux, lane_status);
@@ -234,7 +233,7 @@ static int hibmc_dp_link_training_cr(struct hibmc_dp_dev *dp)
voltage_tries = level_changed ? 1 : voltage_tries + 1;
}
- drm_err(dp->dev, "dp link training clock recovery 80 times failed\n");
+ drm_err(dp->dev, "dp link training clock recovery %u times failed\n", max_cr);
dp->link.status.clock_recovered = false;
return 0;
@@ -244,9 +243,17 @@ static int hibmc_dp_link_training_channel_eq(struct hibmc_dp_dev *dp)
{
u8 lane_status[DP_LINK_STATUS_SIZE] = {0};
u8 eq_tries;
+ int tps;
int ret;
- ret = hibmc_dp_link_set_pattern(dp, DP_TRAINING_PATTERN_2);
+ if (dp->link.cap.is_tps4)
+ tps = DP_TRAINING_PATTERN_4;
+ else if (dp->link.cap.is_tps3)
+ tps = DP_TRAINING_PATTERN_3;
+ else
+ tps = DP_TRAINING_PATTERN_2;
+
+ ret = hibmc_dp_link_set_pattern(dp, tps);
if (ret)
return ret;
@@ -313,11 +320,27 @@ static int hibmc_dp_link_downgrade_training_eq(struct hibmc_dp_dev *dp)
return hibmc_dp_link_reduce_rate(dp);
}
+static void hibmc_dp_update_caps(struct hibmc_dp_dev *dp)
+{
+ dp->link.cap.rx_dpcd_revision = dp->dpcd[DP_DPCD_REV];
+
+ dp->link.cap.is_tps3 = (dp->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_13) &&
+ (dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED);
+ dp->link.cap.is_tps4 = (dp->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14) &&
+ (dp->dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED);
+}
+
int hibmc_dp_link_training(struct hibmc_dp_dev *dp)
{
struct hibmc_dp_link *link = &dp->link;
int ret;
+ ret = drm_dp_read_dpcd_caps(dp->aux, dp->dpcd);
+ if (ret)
+ drm_err(dp->dev, "dp aux read dpcd failed, ret: %d\n", ret);
+
+ hibmc_dp_update_caps(dp);
+
while (true) {
ret = hibmc_dp_link_training_cr_pre(dp);
if (ret)
--
2.33.0
Powered by blists - more mailing lists