media: rockchip: rkisp1: add support for v12 isp variants

The rkisp1 evolved over soc generations and the rk3326/px30 introduced
the so called v12 - probably meaning v1.2.

Add the new register definitions.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/driver-api/media/drivers/rkisp1.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+The Rockchip Image Signal Processor Driver (rkisp1)
+===================================================
+
+Versions and their differences
+------------------------------
+
+The rkisp1 block underwent some changes between SoC implementations.
+The vendor designates them as:
+
+- V10: used at least in rk3288 and rk3399
+- V11: declared in the original vendor code, but not used
+- V12: used at least in rk3326 and px30
+- V13: used at least in rk1808
+- V20: used in rk3568 and beyond
+
+Right now the kernel supports rkisp1 implementations based
+on V10 and V12 variants. V11 does not seem to be actually used
+and V13 will need some more additions but isn't researched yet,
+especially as it seems to be limited to the rk1808 which hasn't
+reached much market spread.
+
+V20 on the other hand will probably be used in future SoCs and
+has seen really big changes in the vendor kernel, so will need
+quite a bit of research.
+
+Changes from V10 to V12
+-----------------------
+
+- V12 supports a new CSI-host implementation but can still
+  also use the same implementation from V10
+- The module for lens shading correction got changed
+  from 12bit to 13bit width
+- The AWB and AEC modules got replaced to support finer
+  grained data collection
+
+Changes from V12 to V13
+-----------------------
+
+The list for V13 is incomplete and needs further investigation.
+
+- V13 does not support the old CSI-host implementation anymore

drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c

@@ -414,6 +414,10 @@ static int rkisp1_config_mipi(struct rkisp1_device *rkisp1)
 
 	rkisp1_write(rkisp1, mipi_ctrl, RKISP1_CIF_MIPI_CTRL);
 
+	/* V12 could also use a newer csi2-host, but we don't want that yet */
+	if (rkisp1->media_dev.hw_revision == RKISP1_V12)
+		rkisp1_write(rkisp1, 0, RKISP1_CIF_ISP_CSI0_CTRL0);
+
 	/* Configure Data Type and Virtual Channel */
 	rkisp1_write(rkisp1,
 		     RKISP1_CIF_MIPI_DATA_SEL_DT(sink_fmt->mipi_dt) |
@@ -533,6 +537,15 @@ static void rkisp1_config_clk(struct rkisp1_device *rkisp1)
 		  RKISP1_CIF_ICCL_DCROP_CLK;
 
 	rkisp1_write(rkisp1, val, RKISP1_CIF_ICCL);
+
+	/* ensure sp and mp can run at the same time in V12 */
+	if (rkisp1->media_dev.hw_revision == RKISP1_V12) {
+		val = RKISP1_CIF_CLK_CTRL_MI_Y12 | RKISP1_CIF_CLK_CTRL_MI_SP |
+		      RKISP1_CIF_CLK_CTRL_MI_RAW0 | RKISP1_CIF_CLK_CTRL_MI_RAW1 |
+		      RKISP1_CIF_CLK_CTRL_MI_READ | RKISP1_CIF_CLK_CTRL_MI_RAWRD |
+		      RKISP1_CIF_CLK_CTRL_CP | RKISP1_CIF_CLK_CTRL_IE;
+		rkisp1_write(rkisp1, val, RKISP1_CIF_VI_ISP_CLK_CTRL_V12);
+	}
 }
 
 static void rkisp1_isp_start(struct rkisp1_device *rkisp1)

drivers/media/platform/rockchip/rkisp1/rkisp1-stats.c

@@ -195,6 +195,27 @@ static void rkisp1_stats_get_awb_meas_v10(struct rkisp1_stats *stats,
 				RKISP1_CIF_ISP_AWB_GET_MEAN_Y_G(reg_val);
 }
 
+static void rkisp1_stats_get_awb_meas_v12(struct rkisp1_stats *stats,
+					  struct rkisp1_stat_buffer *pbuf)
+{
+	/* Protect against concurrent access from ISR? */
+	struct rkisp1_device *rkisp1 = stats->rkisp1;
+	u32 reg_val;
+
+	pbuf->meas_type |= RKISP1_CIF_ISP_STAT_AWB;
+	reg_val = rkisp1_read(rkisp1, RKISP1_CIF_ISP_AWB_WHITE_CNT_V12);
+	pbuf->params.awb.awb_mean[0].cnt =
+				RKISP1_CIF_ISP_AWB_GET_PIXEL_CNT(reg_val);
+	reg_val = rkisp1_read(rkisp1, RKISP1_CIF_ISP_AWB_MEAN_V12);
+
+	pbuf->params.awb.awb_mean[0].mean_cr_or_r =
+				RKISP1_CIF_ISP_AWB_GET_MEAN_CR_R(reg_val);
+	pbuf->params.awb.awb_mean[0].mean_cb_or_b =
+				RKISP1_CIF_ISP_AWB_GET_MEAN_CB_B(reg_val);
+	pbuf->params.awb.awb_mean[0].mean_y_or_g =
+				RKISP1_CIF_ISP_AWB_GET_MEAN_Y_G(reg_val);
+}
+
 static void rkisp1_stats_get_aec_meas_v10(struct rkisp1_stats *stats,
 					  struct rkisp1_stat_buffer *pbuf)
 {
@@ -208,6 +229,30 @@ static void rkisp1_stats_get_aec_meas_v10(struct rkisp1_stats *stats,
 					RKISP1_CIF_ISP_EXP_MEAN_00_V10 + i * 4);
 }
 
+static void rkisp1_stats_get_aec_meas_v12(struct rkisp1_stats *stats,
+					  struct rkisp1_stat_buffer *pbuf)
+{
+	struct rkisp1_device *rkisp1 = stats->rkisp1;
+	u32 value;
+	int i;
+
+	pbuf->meas_type |= RKISP1_CIF_ISP_STAT_AUTOEXP;
+	for (i = 0; i < RKISP1_CIF_ISP_AE_MEAN_MAX_V12 / 4; i++) {
+		value = rkisp1_read(rkisp1, RKISP1_CIF_ISP_EXP_MEAN_V12 + i * 4);
+		pbuf->params.ae.exp_mean[4 * i + 0] =
+				RKISP1_CIF_ISP_EXP_GET_MEAN_xy0_V12(value);
+		pbuf->params.ae.exp_mean[4 * i + 1] =
+				RKISP1_CIF_ISP_EXP_GET_MEAN_xy1_V12(value);
+		pbuf->params.ae.exp_mean[4 * i + 2] =
+				RKISP1_CIF_ISP_EXP_GET_MEAN_xy2_V12(value);
+		pbuf->params.ae.exp_mean[4 * i + 3] =
+				RKISP1_CIF_ISP_EXP_GET_MEAN_xy3_V12(value);
+	}
+
+	value = rkisp1_read(rkisp1, RKISP1_CIF_ISP_EXP_MEAN_V12 + i * 4);
+	pbuf->params.ae.exp_mean[4 * i + 0] = RKISP1_CIF_ISP_EXP_GET_MEAN_xy0_V12(value);
+}
+
 static void rkisp1_stats_get_afc_meas(struct rkisp1_stats *stats,
 				      struct rkisp1_stat_buffer *pbuf)
 {
@@ -239,6 +284,23 @@ static void rkisp1_stats_get_hst_meas_v10(struct rkisp1_stats *stats,
 	}
 }
 
+static void rkisp1_stats_get_hst_meas_v12(struct rkisp1_stats *stats,
+					  struct rkisp1_stat_buffer *pbuf)
+{
+	struct rkisp1_device *rkisp1 = stats->rkisp1;
+	u32 value;
+	int i;
+
+	pbuf->meas_type |= RKISP1_CIF_ISP_STAT_HIST;
+	for (i = 0; i < RKISP1_CIF_ISP_HIST_BIN_N_MAX_V12 / 2; i++) {
+		value = rkisp1_read(rkisp1, RKISP1_CIF_ISP_HIST_BIN_V12 + i * 4);
+		pbuf->params.hist.hist_bins[2 * i] =
+					RKISP1_CIF_ISP_HIST_GET_BIN0_V12(value);
+		pbuf->params.hist.hist_bins[2 * i + 1] =
+					RKISP1_CIF_ISP_HIST_GET_BIN1_V12(value);
+	}
+}
+
 static void rkisp1_stats_get_bls_meas(struct rkisp1_stats *stats,
 				      struct rkisp1_stat_buffer *pbuf)
 {
@@ -292,6 +354,12 @@ static const struct rkisp1_stats_ops rkisp1_v10_stats_ops = {
 	.get_hst_meas = rkisp1_stats_get_hst_meas_v10,
 };
 
+static struct rkisp1_stats_ops rkisp1_v12_stats_ops = {
+	.get_awb_meas = rkisp1_stats_get_awb_meas_v12,
+	.get_aec_meas = rkisp1_stats_get_aec_meas_v12,
+	.get_hst_meas = rkisp1_stats_get_hst_meas_v12,
+};
+
 static void
 rkisp1_stats_send_measurement(struct rkisp1_stats *stats, u32 isp_ris)
 {
@@ -359,6 +427,9 @@ static void rkisp1_init_stats(struct rkisp1_stats *stats)
 	stats->vdev_fmt.fmt.meta.buffersize =
 		sizeof(struct rkisp1_stat_buffer);
 
+	if (stats->rkisp1->media_dev.hw_revision == RKISP1_V12)
+		stats->ops = &rkisp1_v12_stats_ops;
+	else
 		stats->ops = &rkisp1_v10_stats_ops;
 }