[PATCH RFC] drm/i2c: tda998x: fix sync generation and calculation
From: Sebastian Hesselbarth
Date: Mon Jun 10 2013 - 17:24:18 EST
This fixes the wrong sync generation and sync calculation. It has only
been tested for progressive modes. Sync timings for a bunch of modes
have also been verified with an oscilloscope near-end (TDA998x input)
and far-end (DVI receiver output).
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
---
Note: This patch is based on rmk's Armada DRM driver plus some DT support
fixes, so offsets may vary on your side. Anyway, please 3-way apply and
test wherever possible.
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
Cc: Darren Etheridge <darren.etheridge@xxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/i2c/tda998x_drv.c | 168 ++++++++++++++++++++++---------------
1 files changed, 102 insertions(+), 66 deletions(-)
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 819dcba..1564830 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -141,8 +141,12 @@ struct tda998x_priv {
#define REG_VS_LINE_END_1_LSB REG(0x00, 0xae) /* write */
#define REG_VS_PIX_END_1_MSB REG(0x00, 0xaf) /* write */
#define REG_VS_PIX_END_1_LSB REG(0x00, 0xb0) /* write */
+#define REG_VS_LINE_STRT_2_MSB REG(0x00, 0xb1) /* write */
+#define REG_VS_LINE_STRT_2_LSB REG(0x00, 0xb2) /* write */
#define REG_VS_PIX_STRT_2_MSB REG(0x00, 0xb3) /* write */
#define REG_VS_PIX_STRT_2_LSB REG(0x00, 0xb4) /* write */
+#define REG_VS_LINE_END_2_MSB REG(0x00, 0xb5) /* write */
+#define REG_VS_LINE_END_2_LSB REG(0x00, 0xb6) /* write */
#define REG_VS_PIX_END_2_MSB REG(0x00, 0xb7) /* write */
#define REG_VS_PIX_END_2_LSB REG(0x00, 0xb8) /* write */
#define REG_HS_PIX_START_MSB REG(0x00, 0xb9) /* write */
@@ -153,21 +157,29 @@ struct tda998x_priv {
#define REG_VWIN_START_1_LSB REG(0x00, 0xbe) /* write */
#define REG_VWIN_END_1_MSB REG(0x00, 0xbf) /* write */
#define REG_VWIN_END_1_LSB REG(0x00, 0xc0) /* write */
+#define REG_VWIN_START_2_MSB REG(0x00, 0xc1) /* write */
+#define REG_VWIN_START_2_LSB REG(0x00, 0xc2) /* write */
+#define REG_VWIN_END_2_MSB REG(0x00, 0xc3) /* write */
+#define REG_VWIN_END_2_LSB REG(0x00, 0xc4) /* write */
#define REG_DE_START_MSB REG(0x00, 0xc5) /* write */
#define REG_DE_START_LSB REG(0x00, 0xc6) /* write */
#define REG_DE_STOP_MSB REG(0x00, 0xc7) /* write */
#define REG_DE_STOP_LSB REG(0x00, 0xc8) /* write */
#define REG_TBG_CNTRL_0 REG(0x00, 0xca) /* write */
+# define TBG_CNTRL_0_TOP_TGL (1 << 0)
+# define TBG_CNTRL_0_TOP_SEL (1 << 1)
+# define TBG_CNTRL_0_DE_EXT (1 << 2)
+# define TBG_CNTRL_0_TOP_EXT (1 << 3)
# define TBG_CNTRL_0_FRAME_DIS (1 << 5)
# define TBG_CNTRL_0_SYNC_MTHD (1 << 6)
# define TBG_CNTRL_0_SYNC_ONCE (1 << 7)
#define REG_TBG_CNTRL_1 REG(0x00, 0xcb) /* write */
-# define TBG_CNTRL_1_VH_TGL_0 (1 << 0)
-# define TBG_CNTRL_1_VH_TGL_1 (1 << 1)
-# define TBG_CNTRL_1_VH_TGL_2 (1 << 2)
-# define TBG_CNTRL_1_VHX_EXT_DE (1 << 3)
-# define TBG_CNTRL_1_VHX_EXT_HS (1 << 4)
-# define TBG_CNTRL_1_VHX_EXT_VS (1 << 5)
+# define TBG_CNTRL_1_H_TGL (1 << 0)
+# define TBG_CNTRL_1_V_TGL (1 << 1)
+# define TBG_CNTRL_1_TGL_EN (1 << 2)
+# define TBG_CNTRL_1_X_EXT (1 << 3)
+# define TBG_CNTRL_1_H_EXT (1 << 4)
+# define TBG_CNTRL_1_V_EXT (1 << 5)
# define TBG_CNTRL_1_DWIN_DIS (1 << 6)
#define REG_ENABLE_SPACE REG(0x00, 0xd6) /* write */
#define REG_HVF_CNTRL_0 REG(0x00, 0xe4) /* write */
@@ -740,43 +752,57 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *adjusted_mode)
{
struct tda998x_priv *priv = to_tda998x_priv(encoder);
- uint16_t hs_start, hs_end, line_start, line_end;
- uint16_t vwin_start, vwin_end, de_start, de_end;
- uint16_t ref_pix, ref_line, pix_start2;
+ uint16_t ref_pix, ref_line, n_pix, n_line;
+ uint16_t hs_pix_s, hs_pix_e;
+ uint16_t vs1_pix_s, vs1_pix_e, vs1_line_s, vs1_line_e;
+ uint16_t vs2_pix_s, vs2_pix_e, vs2_line_s, vs2_line_e;
+ uint16_t vwin1_line_s, vwin1_line_e;
+ uint16_t vwin2_line_s, vwin2_line_e;
+ uint16_t de_pix_s, de_pix_e;
uint8_t reg, div, rep;
- hs_start = mode->hsync_start - mode->hdisplay;
- hs_end = mode->hsync_end - mode->hdisplay;
- line_start = 1;
- line_end = 1 + mode->vsync_end - mode->vsync_start;
- vwin_start = mode->vtotal - mode->vsync_start;
- vwin_end = vwin_start + mode->vdisplay;
- de_start = mode->htotal - mode->hdisplay;
- de_end = mode->htotal;
-
- pix_start2 = 0;
- if (mode->flags & DRM_MODE_FLAG_INTERLACE)
- pix_start2 = (mode->htotal / 2) + hs_start;
-
- /* TODO how is this value calculated? It is 2 for all common
- * formats in the tables in out of tree nxp driver (assuming
- * I've properly deciphered their byzantine table system)
+ /*
+ * Internally TDA998x is using ITU-R BT.656 style sync but
+ * we get VESA style sync. TDA998x is using a reference pixel
+ * relative to ITU to sync to the input frame and for output
+ * sync generation.
+ *
+ * Now there is some issues to take care of:
+ * - TDA998x register values must be > 0 to be enabled
+ * - REFLINE needs an additional offset of +1
+ * - REFPIX needs an addtional offset of +1 for UYUV and +3 for RGB
+ *
+ * So we add +1 to all horizontal and vertical register values,
+ * plus an additional +3 for REFPIX as we are using RGB input only.
*/
- ref_line = 2;
-
- /* this might changes for other color formats from the CRTC: */
- ref_pix = 3 + hs_start;
+ n_pix = mode->htotal;
+ n_line = mode->vtotal;
+ ref_pix = 4 + mode->hsync_start;
+ ref_line = 2 + mode->vsync_start;
+ de_pix_s = 1;
+ de_pix_e = de_pix_s + mode->hdisplay;
+ hs_pix_s = 1 + mode->hsync_start;
+ hs_pix_e = 1 + mode->hsync_end;
+ vwin1_line_s = 1;
+ vwin1_line_e = vwin1_line_s + mode->vdisplay;
+ vs1_pix_s = vs1_pix_e = hs_pix_s;
+ vs1_line_s = 1 + mode->vsync_start;
+ vs1_line_e = 1 + mode->vsync_end;
+
+ vwin2_line_s = vwin2_line_e = 0;
+ vs2_pix_s = vs2_pix_e = 0;
+ vs2_line_s = vs2_line_e = 0;
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
+ vwin1_line_e = vwin1_line_s + (mode->vdisplay/2);
+ vwin2_line_s = vwin1_line_s + (mode->vtotal/2);
+ vwin2_line_e = vwin2_line_s + (mode->vdisplay/2);
+ vs2_pix_s = vs2_pix_e = hs_pix_s + (mode->htotal/2);
+ vs2_line_s = vs1_line_s + (mode->vtotal/2);
+ vs2_line_e = vs2_line_s + (mode->vsync_end - mode->vsync_start);
+ }
div = 148500 / mode->clock;
- DBG("clock=%d, div=%u", mode->clock, div);
- DBG("hs_start=%u, hs_end=%u, line_start=%u, line_end=%u",
- hs_start, hs_end, line_start, line_end);
- DBG("vwin_start=%u, vwin_end=%u, de_start=%u, de_end=%u",
- vwin_start, vwin_end, de_start, de_end);
- DBG("ref_line=%u, ref_pix=%u, pix_start2=%u",
- ref_line, ref_pix, pix_start2);
-
/* mute the audio FIFO: */
reg_set(encoder, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
@@ -807,9 +833,6 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
reg_write(encoder, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(div) |
PLL_SERIAL_2_SRL_PR(rep));
- reg_write16(encoder, REG_VS_PIX_STRT_2_MSB, pix_start2);
- reg_write16(encoder, REG_VS_PIX_END_2_MSB, pix_start2);
-
/* set color matrix bypass flag: */
reg_set(encoder, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP);
@@ -818,46 +841,59 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
reg_clear(encoder, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_MTHD);
+ /*
+ * Sync on rising HSYNC/VSYNC
+ */
reg_write(encoder, REG_VIP_CNTRL_3, 0);
reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_SYNC_HS);
+
+ /*
+ * TDA19988 requires high-active sync at input stage,
+ * so invert low-active sync provided by master encoder here
+ */
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_H_TGL);
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_V_TGL);
+ /*
+ * Always generate sync polarity relative to input sync and
+ * revert input stage toggled sync at output stage
+ */
+ reg = TBG_CNTRL_1_TGL_EN;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
- reg_set(encoder, REG_VIP_CNTRL_3, VIP_CNTRL_3_H_TGL);
+ reg |= TBG_CNTRL_1_H_TGL;
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ reg |= TBG_CNTRL_1_V_TGL;
+ reg_write(encoder, REG_TBG_CNTRL_1, reg);
reg_write(encoder, REG_VIDFORMAT, 0x00);
- reg_write16(encoder, REG_NPIX_MSB, mode->htotal);
- reg_write16(encoder, REG_NLINE_MSB, mode->vtotal);
- reg_write16(encoder, REG_VS_LINE_STRT_1_MSB, line_start);
- reg_write16(encoder, REG_VS_LINE_END_1_MSB, line_end);
- reg_write16(encoder, REG_VS_PIX_STRT_1_MSB, hs_start);
- reg_write16(encoder, REG_VS_PIX_END_1_MSB, hs_start);
- reg_write16(encoder, REG_HS_PIX_START_MSB, hs_start);
- reg_write16(encoder, REG_HS_PIX_STOP_MSB, hs_end);
- reg_write16(encoder, REG_VWIN_START_1_MSB, vwin_start);
- reg_write16(encoder, REG_VWIN_END_1_MSB, vwin_end);
- reg_write16(encoder, REG_DE_START_MSB, de_start);
- reg_write16(encoder, REG_DE_STOP_MSB, de_end);
+ reg_write16(encoder, REG_REFPIX_MSB, ref_pix);
+ reg_write16(encoder, REG_REFLINE_MSB, ref_line);
+ reg_write16(encoder, REG_NPIX_MSB, n_pix);
+ reg_write16(encoder, REG_NLINE_MSB, n_line);
+ reg_write16(encoder, REG_VS_LINE_STRT_1_MSB, vs1_line_s);
+ reg_write16(encoder, REG_VS_PIX_STRT_1_MSB, vs1_pix_s);
+ reg_write16(encoder, REG_VS_LINE_END_1_MSB, vs1_line_e);
+ reg_write16(encoder, REG_VS_PIX_END_1_MSB, vs1_pix_e);
+ reg_write16(encoder, REG_VS_LINE_STRT_2_MSB, vs2_line_s);
+ reg_write16(encoder, REG_VS_PIX_STRT_2_MSB, vs2_pix_s);
+ reg_write16(encoder, REG_VS_LINE_END_2_MSB, vs2_line_e);
+ reg_write16(encoder, REG_VS_PIX_END_2_MSB, vs2_pix_e);
+ reg_write16(encoder, REG_HS_PIX_START_MSB, hs_pix_s);
+ reg_write16(encoder, REG_HS_PIX_STOP_MSB, hs_pix_e);
+ reg_write16(encoder, REG_VWIN_START_1_MSB, vwin1_line_s);
+ reg_write16(encoder, REG_VWIN_END_1_MSB, vwin1_line_e);
+ reg_write16(encoder, REG_VWIN_START_2_MSB, vwin2_line_s);
+ reg_write16(encoder, REG_VWIN_END_2_MSB, vwin2_line_e);
+ reg_write16(encoder, REG_DE_START_MSB, de_pix_s);
+ reg_write16(encoder, REG_DE_STOP_MSB, de_pix_e);
if (priv->rev == TDA19988) {
/* let incoming pixels fill the active space (if any) */
reg_write(encoder, REG_ENABLE_SPACE, 0x01);
}
- reg_write16(encoder, REG_REFPIX_MSB, ref_pix);
- reg_write16(encoder, REG_REFLINE_MSB, ref_line);
-
- reg = TBG_CNTRL_1_DWIN_DIS | /* HDCP off */
- TBG_CNTRL_1_VH_TGL_2;
- /*
- * It is questionable whether this is correct - the nxp driver
- * does not set VH_TGL_2 and the below for all display modes.
- */
- if (mode->flags & (DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC))
- reg |= TBG_CNTRL_1_VH_TGL_0;
- reg_set(encoder, REG_TBG_CNTRL_1, reg);
-
/* must be last register set: */
reg_clear(encoder, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_ONCE);
--
1.7.2.5
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