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Subject[PATCH v2 04/15] drm/bridge: tc358767: Simplify tc_set_video_mode()
Date
Simplify tc_set_video_mode() by replacing repreated calls to
tc_write()/regmap_write() with a single call to
regmap_multi_reg_write(). While at it, simplify explicit shifting by
using macros from <linux/bitfield.h>. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
---
drivers/gpu/drm/bridge/tc358767.c | 146 +++++++++++++++++-------------
1 file changed, 85 insertions(+), 61 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 38d542f553cd..d99c9f32a133 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -24,6 +24,7 @@
* GNU General Public License for more details.
*/

+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
@@ -56,6 +57,7 @@

/* Video Path */
#define VPCTRL0 0x0450
+#define VSDELAY GENMASK(31, 20)
#define OPXLFMT_RGB666 (0 << 8)
#define OPXLFMT_RGB888 (1 << 8)
#define FRMSYNC_DISABLED (0 << 4) /* Video Timing Gen Disabled */
@@ -63,9 +65,17 @@
#define MSF_DISABLED (0 << 0) /* Magic Square FRC disabled */
#define MSF_ENABLED (1 << 0) /* Magic Square FRC enabled */
#define HTIM01 0x0454
+#define HPW GENMASK(8, 0)
+#define HBPR GENMASK(24, 16)
#define HTIM02 0x0458
+#define HDISPR GENMASK(10, 0)
+#define HFPR GENMASK(24, 16)
#define VTIM01 0x045c
+#define VSPR GENMASK(7, 0)
+#define VBPR GENMASK(23, 16)
#define VTIM02 0x0460
+#define VFPR GENMASK(23, 16)
+#define VDISPR GENMASK(10, 0)
#define VFUEN0 0x0464
#define VFUEN BIT(0) /* Video Frame Timing Upload */

@@ -100,14 +110,28 @@
/* Main Channel */
#define DP0_SECSAMPLE 0x0640
#define DP0_VIDSYNCDELAY 0x0644
+#define VID_SYNC_DLY GENMASK(15, 0)
+#define THRESH_DLY GENMASK(31, 16)
+
#define DP0_TOTALVAL 0x0648
+#define H_TOTAL GENMASK(15, 0)
+#define V_TOTAL GENMASK(31, 16)
#define DP0_STARTVAL 0x064c
+#define H_START GENMASK(15, 0)
+#define V_START GENMASK(31, 16)
#define DP0_ACTIVEVAL 0x0650
+#define H_ACT GENMASK(15, 0)
+#define V_ACT GENMASK(31, 16)
+
#define DP0_SYNCVAL 0x0654
+#define VS_WIDTH GENMASK(30, 16)
+#define HS_WIDTH GENMASK(14, 0)
#define SYNCVAL_HS_POL_ACTIVE_LOW (1 << 15)
#define SYNCVAL_VS_POL_ACTIVE_LOW (1 << 31)
#define DP0_MISC 0x0658
#define TU_SIZE_RECOMMENDED (63) /* LSCLK cycles per TU */
+#define MAX_TU_SYMBOL GENMASK(28, 23)
+#define TU_SIZE GENMASK(21, 16)
#define BPC_6 (0 << 5)
#define BPC_8 (1 << 5)

@@ -184,6 +208,12 @@

/* Test & Debug */
#define TSTCTL 0x0a00
+#define COLOR_R GENMASK(31, 24)
+#define COLOR_G GENMASK(23, 16)
+#define COLOR_B GENMASK(15, 8)
+#define ENI2CFILTER BIT(4)
+#define COLOR_BAR_MODE GENMASK(1, 0)
+#define COLOR_BAR_MODE_BARS 2
#define PLL_DBG 0x0a04

static bool tc_test_pattern;
@@ -647,10 +677,6 @@ static int tc_get_display_props(struct tc_data *tc)

static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
{
- int ret;
- int vid_sync_dly;
- int max_tu_symbol;
-
int left_margin = mode->htotal - mode->hsync_end;
int right_margin = mode->hsync_start - mode->hdisplay;
int hsync_len = mode->hsync_end - mode->hsync_start;
@@ -659,76 +685,74 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
int vsync_len = mode->vsync_end - mode->vsync_start;

/*
- * Recommended maximum number of symbols transferred in a transfer unit:
+ * 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",
- left_margin, right_margin, hsync_len);
- dev_dbg(tc->dev, "V margin %d,%d sync %d\n",
- upper_margin, lower_margin, vsync_len);
- dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal);
-
+ int max_tu_symbol = TU_SIZE_RECOMMENDED - 1;

+ /* DP Main Stream Attributes */
+ int vid_sync_dly = hsync_len + left_margin + mode->hdisplay;
/*
* 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, (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 */
- (mode->vdisplay << 0)); /* height */
- tc_write(VFUEN0, VFUEN); /* update settings */
-
- /* Test pattern settings */
- tc_write(TSTCTL,
- (120 << 24) | /* Red Color component value */
- (20 << 16) | /* Green Color component value */
- (99 << 8) | /* Blue Color component value */
- (1 << 4) | /* Enable I2C Filter */
- (2 << 0) | /* Color bar Mode */
- 0);
-
- /* DP Main Stream Attributes */
- vid_sync_dly = hsync_len + left_margin + mode->hdisplay;
- tc_write(DP0_VIDSYNCDELAY,
- (max_tu_symbol << 16) | /* thresh_dly */
- (vid_sync_dly << 0));
+ const u32 vs_pol = mode->flags & DRM_MODE_FLAG_NVSYNC ?
+ SYNCVAL_VS_POL_ACTIVE_LOW : 0;
+ const u32 hs_pol = mode->flags & DRM_MODE_FLAG_NHSYNC ?
+ SYNCVAL_HS_POL_ACTIVE_LOW : 0;
+ const struct reg_sequence video_mode_settings[] = {
+ { VPCTRL0, FIELD_PREP(VSDELAY, 0) |
+ OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED },
+ { HTIM01, FIELD_PREP(HBPR, ALIGN(left_margin, 2)) |
+ FIELD_PREP(HPW, ALIGN(hsync_len, 2)) },
+ { HTIM02, FIELD_PREP(HDISPR, ALIGN(mode->hdisplay, 2)) |
+ FIELD_PREP(HFPR, ALIGN(right_margin, 2)) },
+ { VTIM01, FIELD_PREP(VBPR, upper_margin) |
+ FIELD_PREP(VSPR, vsync_len) },
+ { VTIM02, FIELD_PREP(VFPR, lower_margin) |
+ FIELD_PREP(VDISPR, mode->vdisplay) },
+ { VFUEN0, VFUEN },
+ { TSTCTL, FIELD_PREP(COLOR_R, 120) |
+ FIELD_PREP(COLOR_G, 20) |
+ FIELD_PREP(COLOR_B, 99) |
+ ENI2CFILTER |
+ FIELD_PREP(COLOR_BAR_MODE, COLOR_BAR_MODE_BARS) },
+ { DP0_VIDSYNCDELAY, FIELD_PREP(THRESH_DLY, max_tu_symbol) |
+ FIELD_PREP(VID_SYNC_DLY, vid_sync_dly) },
+ { DP0_TOTALVAL, FIELD_PREP(H_TOTAL, mode->htotal) |
+ FIELD_PREP(V_TOTAL, mode->vtotal) },
+ { DP0_STARTVAL, FIELD_PREP(H_START, left_margin + hsync_len) |
+ FIELD_PREP(V_START,
+ upper_margin + vsync_len) },
+ { DP0_ACTIVEVAL, FIELD_PREP(V_ACT, mode->vdisplay) |
+ FIELD_PREP(H_ACT, mode->hdisplay) },
+ { DP0_SYNCVAL, FIELD_PREP(VS_WIDTH, vsync_len) |
+ FIELD_PREP(HS_WIDTH, hsync_len) |
+ hs_pol | vs_pol },
+ { DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
+ DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 |
+ DPI_BPP_RGB888 },
+ { DP0_MISC, FIELD_PREP(MAX_TU_SYMBOL, max_tu_symbol) |
+ FIELD_PREP(TU_SIZE, TU_SIZE_RECOMMENDED) |
+ BPC_8 },
+ };

- tc_write(DP0_TOTALVAL, (mode->vtotal << 16) | (mode->htotal));
-
- tc_write(DP0_STARTVAL,
- ((upper_margin + vsync_len) << 16) |
- ((left_margin + hsync_len) << 0));
-
- tc_write(DP0_ACTIVEVAL, (mode->vdisplay << 16) | (mode->hdisplay));
-
- tc_write(DP0_SYNCVAL, (vsync_len << 16) | (hsync_len << 0) |
- ((mode->flags & DRM_MODE_FLAG_NHSYNC) ? SYNCVAL_HS_POL_ACTIVE_LOW : 0) |
- ((mode->flags & DRM_MODE_FLAG_NVSYNC) ? SYNCVAL_VS_POL_ACTIVE_LOW : 0));
-
- tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
- DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888);
-
- tc_write(DP0_MISC, (max_tu_symbol << 23) | (TU_SIZE_RECOMMENDED << 16) |
- BPC_8);
+ dev_dbg(tc->dev, "set mode %dx%d\n",
+ mode->hdisplay, mode->vdisplay);
+ dev_dbg(tc->dev, "H margin %d,%d sync %d\n",
+ left_margin, right_margin, hsync_len);
+ dev_dbg(tc->dev, "V margin %d,%d sync %d\n",
+ upper_margin, lower_margin, vsync_len);
+ dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal);

- return 0;
-err:
- return ret;
+ return regmap_multi_reg_write(tc->regmap,
+ video_mode_settings,
+ ARRAY_SIZE(video_mode_settings));
}

static int tc_wait_link_training(struct tc_data *tc, u32 *error)
--
2.20.1
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