Add a debugfs interface for exercising the various test modes supported
by the DisplayPort controller. This allows performing compliance
testing, or performing signal integrity measurements on a failing link.
At the moment, we do not support sink-driven link quality testing,
although such support would be fairly easy to add.
Signed-off-by: Sean Anderson <sean.ander...@linux.dev>
---
drivers/gpu/drm/xlnx/zynqmp_dp.c | 591 ++++++++++++++++++++++++++++++-
1 file changed, 590 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 040f7b88ee51..57032186e1ca 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -18,7 +18,9 @@
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
@@ -50,6 +52,7 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in
msec (default: 4)");
#define ZYNQMP_DP_LANE_COUNT_SET 0x4
#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
+#define ZYNQMP_DP_LINK_QUAL_PATTERN_SET 0x10
#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
#define ZYNQMP_DP_SOFTWARE_RESET 0x1c
@@ -63,6 +66,9 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in
msec (default: 4)");
ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
ZYNQMP_DP_SOFTWARE_RESET_AUX)
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_1 0x20
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_2 0x24
+#define ZYNQMP_DP_COMP_PATTERN_80BIT_3 0x28
/* Core enable registers */
#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
@@ -206,6 +212,7 @@ MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in
msec (default: 4)");
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
+#define ZYNQMP_DP_TRANSMIT_PRBS7 0x230
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
@@ -273,6 +280,69 @@ struct zynqmp_dp_config {
u8 bpp;
};
+/**
+ * enum test_pattern - Test patterns for test testing
+ * TEST_VIDEO: Use regular video input
+ * TEST_SYMBOL_ERROR: Symbol error measurement pattern
+ * TEST_PRBS7: Output of the PRBS7 (x^7 + x^6 + 1) polynomial
+ * TEST_80BIT_CUSTOM: A custom 80-bit pattern
+ * TEST_CP2520: HBR2 compliance eye pattern
+ * TEST_TPS1: Link training symbol pattern TPS1 (/D10.2/)
+ * TEST_TPS2: Link training symbol pattern TPS2
+ * TEST_TPS3: Link training symbol pattern TPS3 (for HBR2)
+ */
+enum test_pattern {
+ TEST_VIDEO,
+ TEST_TPS1,
+ TEST_TPS2,
+ TEST_TPS3,
+ TEST_SYMBOL_ERROR,
+ TEST_PRBS7,
+ TEST_80BIT_CUSTOM,
+ TEST_CP2520,
+};
+
+static const char *const test_pattern_str[] = {
+ [TEST_VIDEO] = "video",
+ [TEST_TPS1] = "tps1",
+ [TEST_TPS2] = "tps2",
+ [TEST_TPS3] = "tps3",
+ [TEST_SYMBOL_ERROR] = "symbol-error",
+ [TEST_PRBS7] = "prbs7",
+ [TEST_80BIT_CUSTOM] = "80bit-custom",
+ [TEST_CP2520] = "cp2520",
+};
+
+/**
+ * struct zynqmp_dp_test - Configuration for test mode
+ * @pattern: The test pattern
+ * @enhanced: Use enhanced framing
+ * @downspread: Use SSC
+ * @active: Whether test mode is active
+ * @custom: Custom pattern for %TEST_80BIT_CUSTOM
+ * @train_set: Voltage/preemphasis settings
+ * @bw_code: Bandwidth code for the link
+ * @link_cnt: Number of lanes
+ */
+struct zynqmp_dp_test {
+ enum test_pattern pattern;
+ bool enhanced, downspread, active;
+ u8 custom[10];
+ u8 train_set[ZYNQMP_DP_MAX_LANES];
+ u8 bw_code;
+ u8 link_cnt;
+};
+
+/**
+ * struct zynqmp_dp_train_set_priv - Private data for train_set debugfs files
+ * @dp: DisplayPort IP core structure
+ * @lane: The lane for this file
+ */
+struct zynqmp_dp_train_set_priv {
+ struct zynqmp_dp *dp;
+ int lane;
+};
+
/**
* struct zynqmp_dp - Xilinx DisplayPort core
* @dev: device structure
@@ -283,6 +353,7 @@ struct zynqmp_dp_config {
* @irq: irq
* @bridge: DRM bridge for the DP encoder
* @next_bridge: The downstream bridge
+ * @test: Configuration for test mode
* @config: IP core configuration from DTS
* @aux: aux channel
* @phy: PHY handles for DP lanes
@@ -294,6 +365,7 @@ struct zynqmp_dp_config {
* @link_config: common link configuration between IP core and sink device
* @mode: current mode between IP core and sink device
* @train_set: set of training data
+ * @debugfs_train_set: Debugfs private data for @train_set
*/
struct zynqmp_dp {
struct device *dev;
@@ -306,6 +378,7 @@ struct zynqmp_dp {
struct drm_bridge bridge;
struct drm_bridge *next_bridge;
+ struct zynqmp_dp_test test;
struct zynqmp_dp_config config;
struct drm_dp_aux aux;
struct phy *phy[ZYNQMP_DP_MAX_LANES];
@@ -318,6 +391,7 @@ struct zynqmp_dp {
struct zynqmp_dp_link_config link_config;
struct zynqmp_dp_mode mode;
u8 train_set[ZYNQMP_DP_MAX_LANES];
+ struct zynqmp_dp_train_set_priv debugfs_train_set[ZYNQMP_DP_MAX_LANES];
};
static inline struct zynqmp_dp *bridge_to_dp(struct drm_bridge *bridge)
@@ -1599,6 +1673,510 @@ static struct edid *zynqmp_dp_bridge_get_edid(struct
drm_bridge *bridge,
return drm_get_edid(connector, &dp->aux.ddc);
}
+/*
-----------------------------------------------------------------------------
+ * debugfs
+ */
+
+/**
+ * zynqmp_dp_set_test_pattern() - Configure the link for a test pattern
+ * @dp: DisplayPort IP core structure
+ */
+static void zynqmp_dp_set_test_pattern(struct zynqmp_dp *dp,
+ enum test_pattern pattern,
+ u8 *const custom)
+{
+ bool scramble = false;
+ u32 train_pattern = 0;
+ u32 link_pattern = 0;
+ u8 dpcd_train = 0;
+ u8 dpcd_link = 0;
+ int err;
+
+ switch (pattern) {
+ case TEST_TPS1:
+ train_pattern = 1;
+ break;
+ case TEST_TPS2:
+ train_pattern = 2;
+ break;
+ case TEST_TPS3:
+ train_pattern = 3;
+ break;
+ case TEST_SYMBOL_ERROR:
+ scramble = true;
+ link_pattern = DP_PHY_TEST_PATTERN_ERROR_COUNT;
+ break;
+ case TEST_PRBS7:
+ /* We use a dedicated register to enable PRBS7 */
+ dpcd_link = DP_LINK_QUAL_PATTERN_ERROR_RATE;
+ break;
+ case TEST_80BIT_CUSTOM: {
+ const u8 *p = custom;
+
+ link_pattern = DP_LINK_QUAL_PATTERN_80BIT_CUSTOM;
+
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_1,
+ (p[3] << 24) | (p[2] << 16) | (p[1] << 8) |
p[0]);
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_2,
+ (p[7] << 24) | (p[6] << 16) | (p[5] << 8) |
p[4]);
+ zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_3,
+ (p[9] << 8) | p[8]);
+ break;
+ }
+ case TEST_CP2520:
+ link_pattern = DP_LINK_QUAL_PATTERN_CP2520_PAT_1;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ fallthrough;
+ case TEST_VIDEO:
+ scramble = true;
+ }
+
+ zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, !scramble);
+ zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, train_pattern);
+ zynqmp_dp_write(dp, ZYNQMP_DP_LINK_QUAL_PATTERN_SET, link_pattern);
+ zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMIT_PRBS7, pattern == TEST_PRBS7);
+
+ dpcd_link = dpcd_link ?: link_pattern;
+ dpcd_train = train_pattern;
+ if (!scramble)
+ dpcd_train |= DP_LINK_SCRAMBLING_DISABLE;
+
+ if (dp->dpcd[DP_DPCD_REV] < 0x12) {
+ if (pattern == TEST_CP2520)
+ dev_warn(dp->dev,
+ "can't set sink link quality pattern to CP2520
for DPCD < r1.2; error counters will be invalid\n");
+ else
+ dpcd_train |= FIELD_PREP(DP_LINK_QUAL_PATTERN_11_MASK,
+ dpcd_link);
+ } else {
+ u8 dpcd_link_lane[ZYNQMP_DP_MAX_LANES];
+
+ memset(dpcd_link_lane, dpcd_link, ZYNQMP_DP_MAX_LANES);
+ err = drm_dp_dpcd_write(&dp->aux, DP_LINK_QUAL_LANE0_SET,
+ dpcd_link_lane, ZYNQMP_DP_MAX_LANES);
+ if (err < 0)
+ dev_err(dp->dev, "failed to set quality pattern\n");
+ }
+
+ err = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, dpcd_train);
+ if (err < 0)
+ dev_err(dp->dev, "failed to set training pattern\n");
+}
+
+static int zynqmp_dp_test_setup(struct zynqmp_dp *dp)
+{
+ return zynqmp_dp_setup(dp, dp->test.bw_code, dp->test.link_cnt,
+ dp->test.enhanced, dp->test.downspread, true);
+}
+
+static ssize_t zynqmp_dp_pattern_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ char buf[16];
+ ssize_t ret;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ mutex_lock(&dp->lock);
+ ret = snprintf(buf, sizeof(buf), "%s\n",
+ test_pattern_str[dp->test.pattern]);
+ mutex_unlock(&dp->lock);
+
+ debugfs_file_put(dentry);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+}
+
+static ssize_t zynqmp_dp_pattern_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ char buf[16];
+ ssize_t ret;
+ int pattern;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf,
+ count);
+ if (ret < 0)
+ goto out;
+ buf[ret] = '\0';
+
+ pattern = sysfs_match_string(test_pattern_str, buf);
+ if (pattern < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ mutex_lock(&dp->lock);
+ dp->test.pattern = pattern;
+ if (dp->test.active)
+ zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom);
+ mutex_unlock(&dp->lock);
+
+out:
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static const struct file_operations fops_zynqmp_dp_pattern = {
+ .read = zynqmp_dp_pattern_read,
+ .write = zynqmp_dp_pattern_write,
+ .open = simple_open,
+ .llseek = noop_llseek,
+};
+
+static int zynqmp_dp_enhanced_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.enhanced;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_enhanced_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ dp->test.enhanced = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_enhanced, zynqmp_dp_enhanced_get,
+ zynqmp_dp_enhanced_set, "%llu\n");
+
+static int zynqmp_dp_downspread_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.downspread;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_downspread_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ dp->test.downspread = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_downspread, zynqmp_dp_downspread_get,
+ zynqmp_dp_downspread_set, "%llu\n");
+
+static int zynqmp_dp_active_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.active;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_active_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ mutex_lock(&dp->lock);
+ if (val) {
+ if (val < 2) {
+ ret = zynqmp_dp_test_setup(dp);
+ if (ret)
+ goto out;
+ }
+
+ zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom);
+ zynqmp_dp_update_vs_emph(dp, dp->test.train_set, true);
+ dp->test.active = true;
+ } else {
+ dp->test.active = false;
+ zynqmp_dp_set_test_pattern(dp, TEST_VIDEO, NULL);
+ zynqmp_dp_train_loop(dp);
+ }
+out:
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_active, zynqmp_dp_active_get,
+ zynqmp_dp_active_set, "%llu\n");
+
+static ssize_t zynqmp_dp_custom_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ ssize_t ret;
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ mutex_lock(&dp->lock);
+ ret = simple_read_from_buffer(user_buf, count, ppos, &dp->test.custom,
+ sizeof(dp->test.custom));
+ mutex_unlock(&dp->lock);
+
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static ssize_t zynqmp_dp_custom_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+
+ struct dentry *dentry = file->f_path.dentry;
+ struct zynqmp_dp *dp = file->private_data;
+ ssize_t ret;
+ char buf[sizeof(dp->test.custom)];
+
+ ret = debugfs_file_get(dentry);
+ if (unlikely(ret))
+ return ret;
+
+ ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count);
+ if (ret < 0)
+ goto out;
+
+ mutex_lock(&dp->lock);
+ memcpy(dp->test.custom, buf, ret);
+ if (dp->test.active)
+ zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom);
+ mutex_unlock(&dp->lock);
+
+out:
+ debugfs_file_put(dentry);
+ return ret;
+}
+
+static const struct file_operations fops_zynqmp_dp_custom = {
+ .read = zynqmp_dp_custom_read,
+ .write = zynqmp_dp_custom_write,
+ .open = simple_open,
+ .llseek = noop_llseek,
+};
+
+static int zynqmp_dp_swing_get(void *data, u64 *val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.train_set[priv->lane] & DP_TRAIN_VOLTAGE_SWING_MASK;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_swing_set(void *data, u64 val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+ u8 *train_set = &dp->test.train_set[priv->lane];
+ int ret = 0;
+
+ if (val > 3)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ *train_set &= ~(DP_TRAIN_MAX_SWING_REACHED |
+ DP_TRAIN_VOLTAGE_SWING_MASK);
+ *train_set |= val;
+ if (val == 3)
+ *train_set |= DP_TRAIN_MAX_SWING_REACHED;
+
+ if (dp->test.active)
+ zynqmp_dp_update_vs_emph(dp, dp->test.train_set, true);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_swing, zynqmp_dp_swing_get,
+ zynqmp_dp_swing_set, "%llu\n");
+
+static int zynqmp_dp_preemphasis_get(void *data, u64 *val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+
+ mutex_lock(&dp->lock);
+ *val = FIELD_GET(DP_TRAIN_PRE_EMPHASIS_MASK,
+ dp->test.train_set[priv->lane]);
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_preemphasis_set(void *data, u64 val)
+{
+ struct zynqmp_dp_train_set_priv *priv = data;
+ struct zynqmp_dp *dp = priv->dp;
+ u8 *train_set = &dp->test.train_set[priv->lane];
+ int ret = 0;
+
+ if (val > 2)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ *train_set &= ~(DP_TRAIN_MAX_PRE_EMPHASIS_REACHED |
+ DP_TRAIN_PRE_EMPHASIS_MASK);
+ *train_set |= val;
+ if (val == 2)
+ *train_set |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+ if (dp->test.active)
+ zynqmp_dp_update_vs_emph(dp, dp->test.train_set, true);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_preemphasis, zynqmp_dp_preemphasis_get,
+ zynqmp_dp_preemphasis_set, "%llu\n");
+
+static int zynqmp_dp_lanes_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->test.link_cnt;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_lanes_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ int ret = 0;
+
+ if (val > ZYNQMP_DP_MAX_LANES)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ if (val > dp->num_lanes) {
+ ret = -EINVAL;
+ } else {
+ dp->test.link_cnt = val;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ }
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_lanes, zynqmp_dp_lanes_get,
+ zynqmp_dp_lanes_set, "%llu\n");
+
+static int zynqmp_dp_rate_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_rate_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+ u8 bw_code = drm_dp_link_rate_to_bw_code(val / 10000);
+ int link_rate = drm_dp_bw_code_to_link_rate(bw_code);
+ int ret = 0;
+
+ if (val / 10000 != link_rate)
+ return -EINVAL;
+
+ if (bw_code != DP_LINK_BW_1_62 && bw_code != DP_LINK_BW_2_7 &&
+ bw_code != DP_LINK_BW_5_4)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ dp->test.bw_code = bw_code;
+ if (dp->test.active)
+ ret = zynqmp_dp_test_setup(dp);
+ mutex_unlock(&dp->lock);
+
+ return ret;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_rate, zynqmp_dp_rate_get,
+ zynqmp_dp_rate_set, "%llu\n");
+
+static void zynqmp_dp_bridge_debugfs_init(struct drm_bridge *bridge,
+ struct dentry *root)
+{
+ struct zynqmp_dp *dp = bridge_to_dp(bridge);
+ struct dentry *test;
+ int i;
+
+ dp->test.bw_code = DP_LINK_BW_5_4;
+ dp->test.link_cnt = dp->num_lanes;
+
+ test = debugfs_create_dir("test", root);
+#define CREATE_FILE(name) \
+ debugfs_create_file(#name, 0600, test, dp, &fops_zynqmp_dp_##name)
+ CREATE_FILE(pattern);
+ CREATE_FILE(enhanced);
+ CREATE_FILE(downspread);
+ CREATE_FILE(active);
+ CREATE_FILE(custom);
+ CREATE_FILE(rate);
+ CREATE_FILE(lanes);
+
+ for (i = 0; i < dp->num_lanes; i++) {
+ static const char fmt[] = "lane%d_preemphasis";
+ char name[sizeof(fmt)];
+
+ dp->debugfs_train_set[i].dp = dp;
+ dp->debugfs_train_set[i].lane = i;
+
+ sprintf(name, fmt, i);
+ debugfs_create_file(name, 0600, test,
+ &dp->debugfs_train_set[i],
+ &fops_zynqmp_dp_preemphasis);
+
+ sprintf(name, "lane%d_swing", i);
+ debugfs_create_file(name, 0600, test,
+ &dp->debugfs_train_set[i],
+ &fops_zynqmp_dp_swing);
+ }
+}
+
static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
.attach = zynqmp_dp_bridge_attach,
.detach = zynqmp_dp_bridge_detach,
@@ -1611,6 +2189,7 @@ static const struct drm_bridge_funcs
zynqmp_dp_bridge_funcs = {
.atomic_check = zynqmp_dp_bridge_atomic_check,
.detect = zynqmp_dp_bridge_detect,
.get_edid = zynqmp_dp_bridge_get_edid,
+ .debugfs_init = zynqmp_dp_bridge_debugfs_init,
};
/*
-----------------------------------------------------------------------------
@@ -1645,6 +2224,9 @@ static void zynqmp_dp_hpd_work_func(struct work_struct
*work)
hpd_work.work);
enum drm_connector_status status;
+ if (dp->test.active)
+ return;
+
status = zynqmp_dp_bridge_detect(&dp->bridge);
drm_bridge_hpd_notify(&dp->bridge, status);
}
@@ -1666,7 +2248,14 @@ static void zynqmp_dp_hpd_irq_work_func(struct
work_struct *work)
if (status[4] & DP_LINK_STATUS_UPDATED ||
!drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
!drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
- zynqmp_dp_train_loop(dp);
+ if (dp->test.active) {
+ dev_dbg(dp->dev, "Ignoring HPD IRQ in test
mode\n");
+ } else {
+ dev_dbg(dp->dev,
+ "Retraining due to HPD IRQ (status is
[%*ph])\n",
+ (int)sizeof(status), status);
+ zynqmp_dp_train_loop(dp);
+ }
}
}
mutex_unlock(&dp->lock);
--
2.35.1.1320.gc452695387.dirty
