diff --git a/Documentation/gpu/drivers.rst b/Documentation/gpu/drivers.rst
index b899cbc5c2b488b982bcb73b85dbc17c8daba239..187201aedbe56d0772e8f2cb72c0bb5ba0d2c3a9 100644
--- a/Documentation/gpu/drivers.rst
+++ b/Documentation/gpu/drivers.rst
@@ -22,6 +22,7 @@ GPU Driver Documentation
afbc
komeda-kms
panfrost
+ zynqmp
.. only:: subproject and html
diff --git a/Documentation/gpu/zynqmp.rst b/Documentation/gpu/zynqmp.rst
new file mode 100644
index 0000000000000000000000000000000000000000..f57bfa0ad6ece88ee4a22be1f5df0ae6e257adb9
--- /dev/null
+++ b/Documentation/gpu/zynqmp.rst
@@ -0,0 +1,149 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+===============================================
+Xilinx ZynqMP Ultrascale+ DisplayPort Subsystem
+===============================================
+
+This subsystem handles DisplayPort video and audio output on the ZynqMP. It
+supports in-memory framebuffers with the DisplayPort DMA controller
+(xilinx-dpdma), as well as "live" video and audio from the programmable logic
+(PL). This subsystem can perform several transformations, including color space
+conversion, alpha blending, and audio mixing, although not all features are
+currently supported.
+
+debugfs
+-------
+
+To support debugging and compliance testing, several test modes can be enabled
+though debugfs. The following files in /sys/kernel/debug/dri/X/DP-1/test/
+control the DisplayPort test modes:
+
+active:
+ Writing a 1 to this file will activate test mode, and writing a 0 will
+ deactivate test mode. Writing a 1 or 0 when the test mode is already
+ active/inactive will re-activate/re-deactivate test mode. When test
+ mode is inactive, changes made to other files will have no (immediate)
+ effect, although the settings will be saved for when test mode is
+ activated. When test mode is active, changes made to other files will
+ apply immediately.
+
+custom:
+ Custom test pattern value
+
+downspread:
+ Enable/disable clock downspreading (spread-spectrum clocking) by
+ writing 1/0
+
+enhanced:
+ Enable/disable enhanced framing
+
+ignore_aux_errors:
+ Ignore AUX errors when set to 1. Writes to this file take effect
+ immediately (regardless of whether test mode is active) and affect all
+ AUX transfers.
+
+ignore_hpd:
+ Ignore hotplug events (such as cable removals or monitor link
+ retraining requests) when set to 1. Writes to this file take effect
+ immediately (regardless of whether test mode is active).
+
+laneX_preemphasis:
+ Preemphasis from 0 (lowest) to 2 (highest) for lane X
+
+laneX_swing:
+ Voltage swing from 0 (lowest) to 3 (highest) for lane X
+
+lanes:
+ Number of lanes to use (1, 2, or 4)
+
+pattern:
+ Test pattern. May be one of:
+
+ video
+ Use regular video input
+
+ symbol-error
+ Symbol error measurement pattern
+
+ prbs7
+ Output of the PRBS7 (x^7 + x^6 + 1) polynomial
+
+ 80bit-custom
+ A custom 80-bit pattern
+
+ cp2520
+ HBR2 compliance eye pattern
+
+ tps1
+ Link training symbol pattern TPS1 (/D10.2/)
+
+ tps2
+ Link training symbol pattern TPS2
+
+ tps3
+ Link training symbol pattern TPS3 (for HBR2)
+
+rate:
+ Rate in hertz. One of
+
+ * 5400000000 (HBR2)
+ * 2700000000 (HBR)
+ * 1620000000 (RBR)
+
+You can dump the displayport test settings with the following command::
+
+ for prop in /sys/kernel/debug/dri/1/DP-1/test/*; do
+ printf '%-17s ' ${prop##*/}
+ if [ ${prop##*/} = custom ]; then
+ hexdump -C $prop | head -1
+ else
+ cat $prop
+ fi
+ done
+
+The output could look something like::
+
+ active 1
+ custom 00000000 00 00 00 00 00 00 00 00 00 00 |..........|
+ downspread 0
+ enhanced 1
+ ignore_aux_errors 1
+ ignore_hpd 1
+ lane0_preemphasis 0
+ lane0_swing 3
+ lane1_preemphasis 0
+ lane1_swing 3
+ lanes 2
+ pattern prbs7
+ rate 1620000000
+
+The recommended test procedure is to connect the board to a monitor,
+configure test mode, activate test mode, and then disconnect the cable
+and connect it to your test equipment of choice. For example, one
+sequence of commands could be::
+
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/enhanced
+ echo tps1 > /sys/kernel/debug/dri/1/DP-1/test/pattern
+ echo 1620000000 > /sys/kernel/debug/dri/1/DP-1/test/rate
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/ignore_aux_errors
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/ignore_hpd
+ echo 1 > /sys/kernel/debug/dri/1/DP-1/test/active
+
+at which point the cable could be disconnected from the monitor.
+
+Internals
+---------
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_disp.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dpsub.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_kms.h
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_disp.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dp.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_dpsub.c
+
+.. kernel-doc:: drivers/gpu/drm/xlnx/zynqmp_kms.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 8b993d6de0f32ab44568c8f5b155c2fd679b8ac3..a3c87aab42d9785f15e45e7c005bbd8f474bbd2e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7838,6 +7838,7 @@ L: dri-devel@lists.freedesktop.org
S: Maintained
T: git https://gitlab.freedesktop.org/drm/misc/kernel.git
F: Documentation/devicetree/bindings/display/xlnx/
+F: Documentation/gpu/zynqmp.rst
F: drivers/gpu/drm/xlnx/
DRM GPU SCHEDULER
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 49b4b24f499f5f254a04fb90acf3391b1e197ece..25c5dc61ee88b2257c174cfa696d12ff34a383b7 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>
@@ -51,6 +53,7 @@ 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
@@ -64,6 +67,9 @@ 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
@@ -207,6 +213,7 @@ 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
@@ -274,6 +281,69 @@ 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
@@ -284,23 +354,28 @@ 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
* @aux_done: Completed when we get an AUX reply or timeout
+ * @ignore_aux_errors: If set, AUX errors are suppressed
* @phy: PHY handles for DP lanes
* @num_lanes: number of enabled phy lanes
* @hpd_work: hot plug detection worker
* @hpd_irq_work: hot plug detection IRQ worker
+ * @ignore_hpd: If set, HPD events and IRQs are ignored
* @status: connection status
* @enabled: flag to indicate if the device is enabled
* @dpcd: DP configuration data from currently connected sink device
* @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
*
* @lock covers the link configuration in this struct and the device's
- * registers. It does not cover @aux. It is not strictly required for any of
- * the members which are only modified at probe/remove time (e.g. @dev).
+ * registers. It does not cover @aux or @ignore_aux_errors. It is not strictly
+ * required for any of the members which are only modified at probe/remove time
+ * (e.g. @dev).
*/
struct zynqmp_dp {
struct drm_dp_aux aux;
@@ -320,9 +395,13 @@ struct zynqmp_dp {
enum drm_connector_status status;
int irq;
bool enabled;
+ bool ignore_aux_errors;
+ bool ignore_hpd;
+ struct zynqmp_dp_train_set_priv debugfs_train_set[ZYNQMP_DP_MAX_LANES];
struct zynqmp_dp_mode mode;
struct zynqmp_dp_link_config link_config;
+ struct zynqmp_dp_test test;
struct zynqmp_dp_config config;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
u8 train_set[ZYNQMP_DP_MAX_LANES];
@@ -1034,6 +1113,8 @@ zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (dp->status == connector_status_disconnected) {
dev_dbg(dp->dev, "no connected aux device\n");
+ if (dp->ignore_aux_errors)
+ goto fake_response;
return -ENODEV;
}
@@ -1042,7 +1123,13 @@ zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
- return ret;
+ if (!dp->ignore_aux_errors)
+ return ret;
+
+fake_response:
+ msg->reply = DP_AUX_NATIVE_REPLY_ACK;
+ memset(msg->buffer, 0, msg->size);
+ return msg->size;
}
/**
@@ -1658,6 +1745,582 @@ zynqmp_dp_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
return zynqmp_dp_bridge_default_bus_fmts(num_input_fmts);
}
+/* -----------------------------------------------------------------------------
+ * debugfs
+ */
+
+/**
+ * zynqmp_dp_set_test_pattern() - Configure the link for a test pattern
+ * @dp: DisplayPort IP core structure
+ * @pattern: The test pattern to configure
+ * @custom: The custom pattern to use if @pattern is %TEST_80BIT_CUSTOM
+ *
+ * Return: 0 on success, or negative errno on (DPCD) failure
+ */
+static int 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 ret;
+
+ 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);
+ ret = drm_dp_dpcd_write(&dp->aux, DP_LINK_QUAL_LANE0_SET,
+ dpcd_link_lane, ZYNQMP_DP_MAX_LANES);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, dpcd_train);
+ return ret < 0 ? ret : 0;
+}
+
+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);
+}
+
+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)
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom) ?: ret;
+ 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;
+ }
+
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom);
+ if (ret)
+ goto out;
+
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ if (ret)
+ goto out;
+
+ dp->test.active = true;
+ } else {
+ int err;
+
+ dp->test.active = false;
+ err = zynqmp_dp_set_test_pattern(dp, TEST_VIDEO, NULL);
+ if (err)
+ dev_warn(dp->dev, "could not clear test pattern: %d\n",
+ err);
+ 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)
+ ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern,
+ dp->test.custom) ?: ret;
+ 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)
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ 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)
+ ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set);
+ 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;
+ int link_rate;
+ int ret = 0;
+ u8 bw_code;
+
+ if (do_div(val, 10000))
+ return -EINVAL;
+
+ bw_code = drm_dp_link_rate_to_bw_code(val);
+ link_rate = drm_dp_bw_code_to_link_rate(bw_code);
+ if (val != 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 int zynqmp_dp_ignore_aux_errors_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->aux.hw_mutex);
+ *val = dp->ignore_aux_errors;
+ mutex_unlock(&dp->aux.hw_mutex);
+ return 0;
+}
+
+static int zynqmp_dp_ignore_aux_errors_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+
+ if (val != !!val)
+ return -EINVAL;
+
+ mutex_lock(&dp->aux.hw_mutex);
+ dp->ignore_aux_errors = val;
+ mutex_unlock(&dp->aux.hw_mutex);
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_aux_errors,
+ zynqmp_dp_ignore_aux_errors_get,
+ zynqmp_dp_ignore_aux_errors_set, "%llu\n");
+
+static int zynqmp_dp_ignore_hpd_get(void *data, u64 *val)
+{
+ struct zynqmp_dp *dp = data;
+
+ mutex_lock(&dp->lock);
+ *val = dp->ignore_hpd;
+ mutex_unlock(&dp->lock);
+ return 0;
+}
+
+static int zynqmp_dp_ignore_hpd_set(void *data, u64 val)
+{
+ struct zynqmp_dp *dp = data;
+
+ if (val != !!val)
+ return -EINVAL;
+
+ mutex_lock(&dp->lock);
+ dp->ignore_hpd = val;
+ mutex_lock(&dp->lock);
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_hpd, zynqmp_dp_ignore_hpd_get,
+ zynqmp_dp_ignore_hpd_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);
+ CREATE_FILE(ignore_aux_errors);
+ CREATE_FILE(ignore_hpd);
+
+ 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;
+
+ snprintf(name, sizeof(name), fmt, i);
+ debugfs_create_file(name, 0600, test,
+ &dp->debugfs_train_set[i],
+ &fops_zynqmp_dp_preemphasis);
+
+ snprintf(name, sizeof(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,
@@ -1671,6 +2334,7 @@ static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
.detect = zynqmp_dp_bridge_detect,
.edid_read = zynqmp_dp_bridge_edid_read,
.atomic_get_input_bus_fmts = zynqmp_dp_bridge_get_input_bus_fmts,
+ .debugfs_init = zynqmp_dp_bridge_debugfs_init,
};
/* -----------------------------------------------------------------------------
@@ -1705,6 +2369,11 @@ static void zynqmp_dp_hpd_work_func(struct work_struct *work)
enum drm_connector_status status;
mutex_lock(&dp->lock);
+ if (dp->ignore_hpd) {
+ mutex_unlock(&dp->lock);
+ return;
+ }
+
status = __zynqmp_dp_bridge_detect(dp);
mutex_unlock(&dp->lock);
@@ -1719,6 +2388,11 @@ static void zynqmp_dp_hpd_irq_work_func(struct work_struct *work)
int err;
mutex_lock(&dp->lock);
+ if (dp->ignore_hpd) {
+ mutex_unlock(&dp->lock);
+ return;
+ }
+
err = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
DP_LINK_STATUS_SIZE + 2);
if (err < 0) {