[RFC 10/13] drm/dp_helper: Add support for Configuring DSC for HDMI2.1 Pcon
Ankit Nautiyal
ankit.k.nautiyal at intel.com
Thu Oct 15 10:52:56 UTC 2020
This patch adds registers for getting DSC encoder capability for
a HDMI2.1 PCon. It also addes helper functions to configure
DSC between the PCON and HDMI2.1 sink.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
drivers/gpu/drm/drm_dp_helper.c | 93 +++++++++++++++++++++++++++
include/drm/drm_dp_helper.h | 109 ++++++++++++++++++++++++++++++++
2 files changed, 202 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 33a4ac2fb225..f10a9c2d6f04 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -2929,3 +2929,96 @@ void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux,
}
}
EXPORT_SYMBOL(drm_dp_pcon_hdmi_frl_link_error_count);
+
+static
+int drm_dp_pcon_configure_dsc_enc(struct drm_dp_aux *aux, u8 pps_buf_config)
+{
+ u8 buf = 0;
+ int ret;
+
+ buf |= DP_PCON_ENABLE_DSC_ENCODER;
+ if (pps_buf_config <= DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER) {
+ buf &= ~DP_PCON_ENCODER_PPS_OVERRIDE_MASK;
+ buf |= pps_buf_config << 2;
+ }
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * drm_dp_pcon_pps_default() - Let PCON fill the default pps parameters
+ * for DSC1.2 between PCON & HDMI2.1 sink
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns 0 on success, else returns negative error code.
+ * */
+int drm_dp_pcon_pps_default(struct drm_dp_aux *aux)
+{
+ int ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_DISABLED);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_default);
+
+/**
+ * drm_dp_pcon_pps_override_buf() - Configure PPS encoder override buffer for
+ * HDMI sink
+ * @aux: DisplayPort AUX channel
+ * @pps_buf: 128 bytes to be written into PPS buffer for HDMI sink by PCON.
+ *
+ * Returns 0 on success, else returns negative error code.
+ * */
+int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128])
+{
+ int ret;
+
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVERRIDE_BASE, &pps_buf, 128);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_override_buf);
+
+/*
+ * drm_dp_pcon_pps_override_param() - Write PPS parameters to DSC encoder
+ * override registers
+ * @aux: DisplayPort AUX channel
+ * @pps_param: 3 Parameters (2 Bytes each) : Slice Width, Slice Height,
+ * bits_per_pixel.
+ *
+ * Returns 0 on success, else returns negative error code.
+ * */
+int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6])
+{
+ int ret;
+
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT, &pps_param[0], 2);
+ if (ret < 0)
+ return ret;
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH, &pps_param[1], 2);
+ if (ret < 0)
+ return ret;
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_BPP, &pps_param[2], 2);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_override_param);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index eb26c86dc8ca..3de022d4a65e 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -441,6 +441,83 @@ struct drm_device;
# define DP_FEC_CORR_BLK_ERROR_COUNT_CAP (1 << 2)
# define DP_FEC_BIT_ERROR_COUNT_CAP (1 << 3)
+/* DP-HDMI2.1 PCON DSC ENCODER SUPPORT */
+#define DP_PCON_DSC_ENCODER 0x092
+# define DP_PCON_DSC_ENCODER_SUPPORTED (1 << 0)
+# define DP_PCON_DSC_PPS_ENC_OVERRIDE (1 << 1)
+
+/* DP-HDMI2.1 PCON DSC Version */
+#define DP_PCON_DSC_VERSION 0x093
+# define DP_PCON_DSC_MAJOR_MASK (0xF << 0)
+# define DP_PCON_DSC_MINOR_MASK (0xF << 4)
+# define DP_PCON_DSC_MAJOR_SHIFT 0
+# define DP_PCON_DSC_MINOR_SHIFT 4
+
+/* DP-HDMI2.1 PCON DSC RC Buffer block size */
+#define DP_PCON_DSC_RC_BUF_BLK_INFO 0x094
+# define DP_PCON_DSC_RC_BUF_BLK_SIZE (0x3 << 0)
+# define DP_PCON_DSC_RC_BUF_BLK_1KB 0
+# define DP_PCON_DSC_RC_BUF_BLK_4KB 1
+# define DP_PCON_DSC_RC_BUF_BLK_16KB 2
+# define DP_PCON_DSC_RC_BUF_BLK_64KB 3
+
+/* DP-HDMI2.1 PCON DSC RC Buffer size */
+#define DP_PCON_DSC_RC_BUF_SIZE 0x095
+
+/* DP-HDMI2.1 PCON DSC Slice capabilities-1 */
+#define DP_PCON_DSC_SLICE_CAP_1 0x096
+# define DP_PCON_DSC_1_PER_DSC_ENC (0x1 << 0)
+# define DP_PCON_DSC_2_PER_DSC_ENC (0x1 << 1)
+# define DP_PCON_DSC_4_PER_DSC_ENC (0x1 << 3)
+# define DP_PCON_DSC_6_PER_DSC_ENC (0x1 << 4)
+# define DP_PCON_DSC_8_PER_DSC_ENC (0x1 << 5)
+# define DP_PCON_DSC_10_PER_DSC_ENC (0x1 << 6)
+# define DP_PCON_DSC_12_PER_DSC_ENC (0x1 << 7)
+
+#define DP_PCON_DSC_BUF_BIT_DEPTH 0x097
+# define DP_PCON_DSC_BIT_DEPTH_MASK (0xF << 0)
+# define DP_PCON_DSC_DEPTH_9_BITS 0
+# define DP_PCON_DSC_DEPTH_10_BITS 1
+# define DP_PCON_DSC_DEPTH_11_BITS 2
+# define DP_PCON_DSC_DEPTH_12_BITS 3
+# define DP_PCON_DSC_DEPTH_13_BITS 4
+# define DP_PCON_DSC_DEPTH_14_BITS 5
+# define DP_PCON_DSC_DEPTH_15_BITS 6
+# define DP_PCON_DSC_DEPTH_16_BITS 7
+# define DP_PCON_DSC_DEPTH_8_BITS 8
+
+#define DP_PCON_DSC_BLOCK_PREDICTION 0x098
+# define DP_PCON_DSC_BLOCK_PRED_SUPPORT (0x1 << 0)
+
+#define DP_PCON_DSC_ENC_COLOR_FMT_CAP 0x099
+# define DP_PCON_DSC_ENC_RGB (0x1 << 0)
+# define DP_PCON_DSC_ENC_YUV444 (0x1 << 1)
+# define DP_PCON_DSC_ENC_YUV422_S (0x1 << 2)
+# define DP_PCON_DSC_ENC_YUV422_N (0x1 << 3)
+# define DP_PCON_DSC_ENC_YUV420_N (0x1 << 4)
+
+#define DP_PCON_DSC_ENC_COLOR_DEPTH_CAP 0x09A
+# define DP_PCON_DSC_ENC_8BPC (0x1 << 0)
+# define DP_PCON_DSC_ENC_10BPC (0x1 << 0)
+# define DP_PCON_DSC_ENC_12BPC (0x1 << 0)
+
+#define DP_PCON_DSC_MAX_SLICE_WIDTH 0x09B
+
+/* DP-HDMI2.1 PCON DSC Slice capabilities-2 */
+#define DP_PCON_DSC_SLICE_CAP_2 0x09C
+# define DP_PCON_DSC_16_PER_DSC_ENC (0x1 << 0)
+# define DP_PCON_DSC_20_PER_DSC_ENC (0x1 << 1)
+# define DP_PCON_DSC_24_PER_DSC_ENC (0x1 << 2)
+
+/* DP-HDMI2.1 PCON HDMI TX Encoder Bits/pixel increment */
+#define DP_PCON_DSC_BPP_INCR 0x09E
+# define DP_PCON_DSC_BPP_INCR_MASK (0x7 << 0)
+# define DP_PCON_DSC_ONE_16TH_BPP 0
+# define DP_PCON_DSC_ONE_8TH_BPP 1
+# define DP_PCON_DSC_ONE_4TH_BPP 2
+# define DP_PCON_DSC_ONE_HALF_BPP 3
+# define DP_PCON_DSC_ONE_BPP 4
+
/* DP Extended DSC Capabilities */
#define DP_DSC_BRANCH_OVERALL_THROUGHPUT_0 0x0a0 /* DP 1.4a SCR */
#define DP_DSC_BRANCH_OVERALL_THROUGHPUT_1 0x0a1
@@ -1134,6 +1211,12 @@ struct drm_device;
# define DP_HDMI_FORCE_SCRAMBLING (1 << 3) /* DP 1.4 */
#define DP_PROTOCOL_CONVERTER_CONTROL_2 0x3052 /* DP 1.3 */
# define DP_CONVERSION_TO_YCBCR422_ENABLE (1 << 0) /* DP 1.3 */
+# define DP_PCON_ENABLE_DSC_ENCODER (1 << 1)
+# define DP_PCON_ENCODER_PPS_OVERRIDE_MASK (0x3 << 2)
+# define DP_PCON_ENC_PPS_OVERRIDE_DISABLED 0
+# define DP_PCON_ENC_PPS_OVERRIDE_EN_PARAMS 1
+# define DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER 2
+
/* PCON Downstream HDMI ERROR Status per Lane */
#define DP_PCON_HDMI_ERROR_STATUS_LN0 0x3037
@@ -1145,6 +1228,29 @@ struct drm_device;
# define DP_PCON_HDMI_ERROR_COUNT_TEN_PLUS (1 << 1)
# define DP_PCON_HDMI_ERROR_COUNT_HUNDRED_PLUS (1 << 2)
+/* PCON HDMI CONFIG PPS Override Buffer
+ * Valid Offsets to be added to Base : 0-127
+ */
+#define DP_PCON_HDMI_PPS_OVERRIDE_BASE 0x3100
+
+/* PCON HDMI CONFIG PPS Override Parameter: Slice height
+ * Offset-0 8LSBs of the Slice height.
+ * Offset-1 8MSBs of the Slice height.
+ */
+#define DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT 0x3180
+
+/* PCON HDMI CONFIG PPS Override Parameter: Slice width
+ * Offset-0 8LSBs of the Slice width.
+ * Offset-1 8MSBs of the Slice width.
+ */
+#define DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH 0x3182
+
+/* PCON HDMI CONFIG PPS Override Parameter: bits_per_pixel
+ * Offset-0 8LSBs of the bits_per_pixel.
+ * Offset-1 2MSBs of the bits_per_pixel.
+ */
+#define DP_PCON_HDMI_PPS_OVRD_BPP 0x3184
+
/* HDCP 1.3 and HDCP 2.2 */
#define DP_AUX_HDCP_BKSV 0x68000
#define DP_AUX_HDCP_RI_PRIME 0x68005
@@ -2063,4 +2169,7 @@ int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux);
bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux);
int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask);
void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux, struct drm_connector *connector);
+int drm_dp_pcon_pps_default(struct drm_dp_aux *aux);
+int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128]);
+int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6]);
#endif /* _DRM_DP_HELPER_H_ */
--
2.17.1
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