On Sat, Mar 16, 2024 at 07:56:52PM +0200, Dmitry Baryshkov wrote: > On Sat, 16 Mar 2024 at 01:09, Sean Anderson <sean.anderson@xxxxxxxxx> wrote: > > > > 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. > > Could you please point out how this is used for compliance testing? We > have been using the msm_dp_compliance tool [1]. > > I think it would be nice to rework our drivers towards a common > debugfs interface used for DP connectors, maybe defining generic > internal interface/helpers like Maxime is implementing for HDMI > connectors. This would be really nice :-) > [1] https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/blob/master/tools/msm_dp_compliance.c?ref_type=heads > > > > > Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx> > > --- > > > > 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); -- Regards, Laurent Pinchart
