drm/bridge: tc358767: fix timing calculations

Fields in HTIM01 and HTIM02 regs should be even.
Recomended thresh_dly value is max_tu_symbol.
Remove set of VPCTRL0.VSDELAY as it is related to DSI input
interface. Currently driver supports only DPI.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-5-git-send-email-andrey.gusakov@cogentembedded.com

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 7334cb2121a3838e60b73388f6edae0ef9184dc6..b916346b933a5f2e4144fc1e3dac2b2bf7049808 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -659,6 +659,14 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
        int lower_margin = mode->vsync_start - mode->vdisplay;
        int vsync_len = mode->vsync_end - mode->vsync_start;
 
+       /*
+        * Recommended maximum number of symbols transferred in a transfer unit:
+        * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size,
+        *              (output active video bandwidth in bytes))
+        * Must be less than tu_size.
+        */
+       max_tu_symbol = TU_SIZE_RECOMMENDED - 1;
+
        dev_dbg(tc->dev, "set mode %dx%d\n",
                mode->hdisplay, mode->vdisplay);
        dev_dbg(tc->dev, "H margin %d,%d sync %d\n",
@@ -668,13 +676,18 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
        dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal);
 
 
-       /* LCD Ctl Frame Size */
-       tc_write(VPCTRL0, (0x40 << 20) /* VSDELAY */ |
+       /*
+        * LCD Ctl Frame Size
+        * datasheet is not clear of vsdelay in case of DPI
+        * assume we do not need any delay when DPI is a source of
+        * sync signals
+        */
+       tc_write(VPCTRL0, (0 << 20) /* VSDELAY */ |
                 OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED);
-       tc_write(HTIM01, (left_margin << 16) |          /* H back porch */
-                        (hsync_len << 0));             /* Hsync */
-       tc_write(HTIM02, (right_margin << 16) |         /* H front porch */
-                        (mode->hdisplay << 0));        /* width */
+       tc_write(HTIM01, (ALIGN(left_margin, 2) << 16) | /* H back porch */
+                        (ALIGN(hsync_len, 2) << 0));    /* Hsync */
+       tc_write(HTIM02, (ALIGN(right_margin, 2) << 16) |  /* H front porch */
+                        (ALIGN(mode->hdisplay, 2) << 0)); /* width */
        tc_write(VTIM01, (upper_margin << 16) |         /* V back porch */
                         (vsync_len << 0));             /* Vsync */
        tc_write(VTIM02, (lower_margin << 16) |         /* V front porch */
@@ -693,7 +706,7 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
        /* DP Main Stream Attributes */
        vid_sync_dly = hsync_len + left_margin + mode->hdisplay;
        tc_write(DP0_VIDSYNCDELAY,
-                (0x003e << 16) |       /* thresh_dly */
+                (max_tu_symbol << 16) |        /* thresh_dly */
                 (vid_sync_dly << 0));
 
        tc_write(DP0_TOTALVAL, (mode->vtotal << 16) | (mode->htotal));
@@ -709,13 +722,6 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
        tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
                 DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888);
 
-       /*
-        * Recommended maximum number of symbols transferred in a transfer unit:
-        * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size,
-        *              (output active video bandwidth in bytes))
-        * Must be less than tu_size.
-        */
-       max_tu_symbol = TU_SIZE_RECOMMENDED - 1;
        tc_write(DP0_MISC, (max_tu_symbol << 23) | (TU_SIZE_RECOMMENDED << 16) |
                           BPC_8);