During phy complaince auto test mode source need to read
requested test pattern from sink through DPCD. After processing
the request source need to set the pattern. So set/get method
added in drm layer as it is DP protocol.
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/drm_dp_helper.c | 77 +++++++++++++++++++++++++++++++++
include/drm/drm_dp_helper.h | 28 ++++++++++++
2 files changed, 105 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index f373798d82f6..3cb7170e55f4 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1484,3 +1484,80 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_S
return num_bpc;
}
EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs);
+
+/**
+ * drm_dp_get_phy_test_pattern() - get the requested pattern from the sink.
+ * @aux: DisplayPort AUX channel
+ * @data: DP phy compliance test parameters.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data)
+{
+ int err;
+
+ err = drm_dp_link_probe(aux, &data->link);
+ if (err < 0)
+ return err;
+
+ err = drm_dp_dpcd_read(aux, DP_TEST_PHY_PATTERN, &data->phy_pattern, 1);
+ if (err < 0)
+ return err;
+
+ switch (data->phy_pattern) {
+ case DP_TEST_PHY_PATTERN_80BIT_CUSTOM:
+ err = drm_dp_dpcd_read(aux, DP_TEST_80BIT_CUSTOM_PATTERN_7_0,
+ &data->custom80, 10);
+ if (err < 0)
+ return err;
+
+ break;
+ case DP_TEST_PHY_PATTERN_CP2520:
+ err = drm_dp_dpcd_read(aux, DP_TEST_HBR2_SCRAMBLER_RESET,
+ &data->hbr2_reset, 2);
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_get_phy_test_pattern);
+
+/**
+ * drm_dp_set_phy_test_pattern() - set the pattern to the sink.
+ * @aux: DisplayPort AUX channel
+ * @data: DP phy compliance test parameters.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data)
+{
+ int err, i;
+ u8 test_pattern;
+
+ err = drm_dp_link_configure(aux, &data->link);
+ if (err < 0)
+ return err;
+
+ test_pattern = data->phy_pattern;
+ if (data->link.revision < 0x12) {
+ test_pattern = (test_pattern << 2) &
+ DP_LINK_QUAL_PATTERN_11_MASK;
+ err = drm_dp_dpcd_write(aux, DP_TRAINING_PATTERN_SET,
+ &test_pattern, 1);
+ if (err < 0)
+ return err;
+ } else {
+ for (i = 0; i < data->link.num_lanes; i++) {
+ err = drm_dp_dpcd_write(aux, DP_LINK_QUAL_LANE0_SET + i,
+ &test_pattern, 1);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_set_phy_test_pattern);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index ed1a985745ba..77dcf5879beb 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -691,6 +691,14 @@
# define DP_TEST_COUNT_MASK 0xf
#define DP_TEST_PHY_PATTERN 0x248
+# define DP_TEST_PHY_PATTERN_NONE 0
+# define DP_TEST_PHY_PATTERN_D10_2 1
+# define DP_TEST_PHY_PATTERN_ERROR_COUNT 2
+# define DP_TEST_PHY_PATTERN_PRBS7 3
+# define DP_TEST_PHY_PATTERN_80BIT_CUSTOM 4
+# define DP_TEST_PHY_PATTERN_CP2520 5
+
+#define DP_TEST_HBR2_SCRAMBLER_RESET 0x24A
#define DP_TEST_80BIT_CUSTOM_PATTERN_7_0 0x250
#define DP_TEST_80BIT_CUSTOM_PATTERN_15_8 0x251
#define DP_TEST_80BIT_CUSTOM_PATTERN_23_16 0x252
@@ -1523,4 +1531,24 @@ static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
#endif
+/**
+ * struct drm_dp_phy_test_params - DP Phy Compliance parameters
+ * @link: Link information.
+ * @phy_pattern: DP Phy test pattern from DPCD 0x248 (sink)
+ * @hb2_reset: DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD
+ * 0x24A and 0x24B (sink)
+ * @custom80: DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250
+ * through 0x259.
+ */
+struct drm_dp_phy_test_params {
+ struct drm_dp_link link;
+ u8 phy_pattern;
+ u8 hbr2_reset[2];
+ u8 custom80[10];
+};
+
+int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data);
+int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data);
#endif /* _DRM_DP_HELPER_H_ */
--
2.22.0
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