drm/msm/dpu: Implement tearcheck support on INTF block

Since DPU 5.0.0 the TEARCHECK registers and interrupts moved out of the
PINGPONG block and into the INTF.  Implement the necessary callbacks in
the INTF block, and use these callbacks together with the INTF_TEAR
interrupts.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/534234/
Link: https://lore.kernel.org/r/20230411-dpu-intf-te-v4-21-27ce1a5ab5c6@somainline.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 0bd99f380a49..5dce18236d87 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -8,6 +8,9 @@
 #include "dpu_hw_catalog.h"
 #include "dpu_hw_intf.h"
 #include "dpu_kms.h"
+#include "dpu_trace.h"
+
+#include <linux/iopoll.h>
 
 #define INTF_TIMING_ENGINE_EN           0x000
 #define INTF_CONFIG                     0x004
@@ -64,6 +67,24 @@
 
 #define INTF_MUX                        0x25C
 #define INTF_STATUS                     0x26C
+#define INTF_AVR_CONTROL                0x270
+#define INTF_AVR_MODE                   0x274
+#define INTF_AVR_TRIGGER                0x278
+#define INTF_AVR_VTOTAL                 0x27C
+#define INTF_TEAR_MDP_VSYNC_SEL         0x280
+#define INTF_TEAR_TEAR_CHECK_EN         0x284
+#define INTF_TEAR_SYNC_CONFIG_VSYNC     0x288
+#define INTF_TEAR_SYNC_CONFIG_HEIGHT    0x28C
+#define INTF_TEAR_SYNC_WRCOUNT          0x290
+#define INTF_TEAR_VSYNC_INIT_VAL        0x294
+#define INTF_TEAR_INT_COUNT_VAL         0x298
+#define INTF_TEAR_SYNC_THRESH           0x29C
+#define INTF_TEAR_START_POS             0x2A0
+#define INTF_TEAR_RD_PTR_IRQ            0x2A4
+#define INTF_TEAR_WR_PTR_IRQ            0x2A8
+#define INTF_TEAR_OUT_LINE_COUNT        0x2AC
+#define INTF_TEAR_LINE_COUNT            0x2B0
+#define INTF_TEAR_AUTOREFRESH_CONFIG    0x2B4
 
 #define INTF_CFG_ACTIVE_H_EN	BIT(29)
 #define INTF_CFG_ACTIVE_V_EN	BIT(30)
@@ -307,6 +328,191 @@ static int dpu_hw_intf_collect_misr(struct dpu_hw_intf *intf, u32 *misr_value)
 	return dpu_hw_collect_misr(&intf->hw, INTF_MISR_CTRL, INTF_MISR_SIGNATURE, misr_value);
 }
 
+static int dpu_hw_intf_enable_te(struct dpu_hw_intf *intf,
+		struct dpu_hw_tear_check *te)
+{
+	struct dpu_hw_blk_reg_map *c;
+	int cfg;
+
+	if (!intf)
+		return -EINVAL;
+
+	c = &intf->hw;
+
+	cfg = BIT(19); /* VSYNC_COUNTER_EN */
+	if (te->hw_vsync_mode)
+		cfg |= BIT(20);
+
+	cfg |= te->vsync_count;
+
+	DPU_REG_WRITE(c, INTF_TEAR_SYNC_CONFIG_VSYNC, cfg);
+	DPU_REG_WRITE(c, INTF_TEAR_SYNC_CONFIG_HEIGHT, te->sync_cfg_height);
+	DPU_REG_WRITE(c, INTF_TEAR_VSYNC_INIT_VAL, te->vsync_init_val);
+	DPU_REG_WRITE(c, INTF_TEAR_RD_PTR_IRQ, te->rd_ptr_irq);
+	DPU_REG_WRITE(c, INTF_TEAR_START_POS, te->start_pos);
+	DPU_REG_WRITE(c, INTF_TEAR_SYNC_THRESH,
+			((te->sync_threshold_continue << 16) |
+			 te->sync_threshold_start));
+	DPU_REG_WRITE(c, INTF_TEAR_SYNC_WRCOUNT,
+			(te->start_pos + te->sync_threshold_start + 1));
+
+	DPU_REG_WRITE(c, INTF_TEAR_TEAR_CHECK_EN, 1);
+
+	return 0;
+}
+
+static void dpu_hw_intf_setup_autorefresh_config(struct dpu_hw_intf *intf,
+		u32 frame_count, bool enable)
+{
+	struct dpu_hw_blk_reg_map *c;
+	u32 refresh_cfg;
+
+	c = &intf->hw;
+	refresh_cfg = DPU_REG_READ(c, INTF_TEAR_AUTOREFRESH_CONFIG);
+	if (enable)
+		refresh_cfg = BIT(31) | frame_count;
+	else
+		refresh_cfg &= ~BIT(31);
+
+	DPU_REG_WRITE(c, INTF_TEAR_AUTOREFRESH_CONFIG, refresh_cfg);
+}
+
+/*
+ * dpu_hw_intf_get_autorefresh_config - Get autorefresh config from HW
+ * @intf:        DPU intf structure
+ * @frame_count: Used to return the current frame count from hw
+ *
+ * Returns: True if autorefresh enabled, false if disabled.
+ */
+static bool dpu_hw_intf_get_autorefresh_config(struct dpu_hw_intf *intf,
+		u32 *frame_count)
+{
+	u32 val = DPU_REG_READ(&intf->hw, INTF_TEAR_AUTOREFRESH_CONFIG);
+
+	if (frame_count != NULL)
+		*frame_count = val & 0xffff;
+	return !!((val & BIT(31)) >> 31);
+}
+
+static int dpu_hw_intf_disable_te(struct dpu_hw_intf *intf)
+{
+	struct dpu_hw_blk_reg_map *c;
+
+	if (!intf)
+		return -EINVAL;
+
+	c = &intf->hw;
+	DPU_REG_WRITE(c, INTF_TEAR_TEAR_CHECK_EN, 0);
+	return 0;
+}
+
+static int dpu_hw_intf_connect_external_te(struct dpu_hw_intf *intf,
+		bool enable_external_te)
+{
+	struct dpu_hw_blk_reg_map *c = &intf->hw;
+	u32 cfg;
+	int orig;
+
+	if (!intf)
+		return -EINVAL;
+
+	c = &intf->hw;
+	cfg = DPU_REG_READ(c, INTF_TEAR_SYNC_CONFIG_VSYNC);
+	orig = (bool)(cfg & BIT(20));
+	if (enable_external_te)
+		cfg |= BIT(20);
+	else
+		cfg &= ~BIT(20);
+	DPU_REG_WRITE(c, INTF_TEAR_SYNC_CONFIG_VSYNC, cfg);
+	trace_dpu_intf_connect_ext_te(intf->idx - INTF_0, cfg);
+
+	return orig;
+}
+
+static int dpu_hw_intf_get_vsync_info(struct dpu_hw_intf *intf,
+		struct dpu_hw_pp_vsync_info *info)
+{
+	struct dpu_hw_blk_reg_map *c = &intf->hw;
+	u32 val;
+
+	if (!intf || !info)
+		return -EINVAL;
+
+	c = &intf->hw;
+
+	val = DPU_REG_READ(c, INTF_TEAR_VSYNC_INIT_VAL);
+	info->rd_ptr_init_val = val & 0xffff;
+
+	val = DPU_REG_READ(c, INTF_TEAR_INT_COUNT_VAL);
+	info->rd_ptr_frame_count = (val & 0xffff0000) >> 16;
+	info->rd_ptr_line_count = val & 0xffff;
+
+	val = DPU_REG_READ(c, INTF_TEAR_LINE_COUNT);
+	info->wr_ptr_line_count = val & 0xffff;
+
+	val = DPU_REG_READ(c, INTF_FRAME_COUNT);
+	info->intf_frame_count = val;
+
+	return 0;
+}
+
+static void dpu_hw_intf_vsync_sel(struct dpu_hw_intf *intf,
+		u32 vsync_source)
+{
+	struct dpu_hw_blk_reg_map *c;
+
+	if (!intf)
+		return;
+
+	c = &intf->hw;
+
+	DPU_REG_WRITE(c, INTF_TEAR_MDP_VSYNC_SEL, (vsync_source & 0xf));
+}
+
+static void dpu_hw_intf_disable_autorefresh(struct dpu_hw_intf *intf,
+					    uint32_t encoder_id, u16 vdisplay)
+{
+	struct dpu_hw_pp_vsync_info info;
+	int trial = 0;
+
+	/* If autorefresh is already disabled, we have nothing to do */
+	if (!dpu_hw_intf_get_autorefresh_config(intf, NULL))
+		return;
+
+	/*
+	 * If autorefresh is enabled, disable it and make sure it is safe to
+	 * proceed with current frame commit/push. Sequence followed is,
+	 * 1. Disable TE
+	 * 2. Disable autorefresh config
+	 * 4. Poll for frame transfer ongoing to be false
+	 * 5. Enable TE back
+	 */
+
+	dpu_hw_intf_connect_external_te(intf, false);
+	dpu_hw_intf_setup_autorefresh_config(intf, 0, false);
+
+	do {
+		udelay(DPU_ENC_MAX_POLL_TIMEOUT_US);
+		if ((trial * DPU_ENC_MAX_POLL_TIMEOUT_US)
+				> (KICKOFF_TIMEOUT_MS * USEC_PER_MSEC)) {
+			DPU_ERROR("enc%d intf%d disable autorefresh failed\n",
+				  encoder_id, intf->idx - INTF_0);
+			break;
+		}
+
+		trial++;
+
+		dpu_hw_intf_get_vsync_info(intf, &info);
+	} while (info.wr_ptr_line_count > 0 &&
+		 info.wr_ptr_line_count < vdisplay);
+
+	dpu_hw_intf_connect_external_te(intf, true);
+
+	DPU_DEBUG("enc%d intf%d disabled autorefresh\n",
+		  encoder_id, intf->idx - INTF_0);
+
+}
+
 static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
 		unsigned long cap)
 {
@@ -319,6 +525,14 @@ static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
 		ops->bind_pingpong_blk = dpu_hw_intf_bind_pingpong_blk;
 	ops->setup_misr = dpu_hw_intf_setup_misr;
 	ops->collect_misr = dpu_hw_intf_collect_misr;
+
+	if (cap & BIT(DPU_INTF_TE)) {
+		ops->enable_tearcheck = dpu_hw_intf_enable_te;
+		ops->disable_tearcheck = dpu_hw_intf_disable_te;
+		ops->connect_external_te = dpu_hw_intf_connect_external_te;
+		ops->vsync_sel = dpu_hw_intf_vsync_sel;
+		ops->disable_autorefresh = dpu_hw_intf_disable_autorefresh;
+	}
 }
 
 struct dpu_hw_intf *dpu_hw_intf_init(const struct dpu_intf_cfg *cfg,