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Date:   Thu, 6 Jun 2019 10:16:16 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Archit Taneja <architt@...eaurora.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cory Tusar <cory.tusar@....aero>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/15] drm/bridge: tc358767: Simplify
 tc_set_video_mode()

On 05.06.2019 09:04, Andrey Smirnov wrote:
> Simplify tc_set_video_mode() by replacing explicit shifting using
> macros from <linux/bitfield.h>. No functional change intended.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Archit Taneja <architt@...eaurora.org>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@...com>
> Cc: Andrey Gusakov <andrey.gusakov@...entembedded.com>
> Cc: Philipp Zabel <p.zabel@...gutronix.de>
> Cc: Cory Tusar <cory.tusar@....aero>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org


Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej


> ---
>  drivers/gpu/drm/bridge/tc358767.c | 106 ++++++++++++++++++++++--------
>  1 file changed, 78 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 115cffc55a96..c0fc686ce5ec 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 */
>  
> @@ -108,14 +118,28 @@
>  /* 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)
>  
> @@ -192,6 +216,12 @@
>  
>  /* 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;
> @@ -672,6 +702,7 @@ static int tc_set_video_mode(struct tc_data *tc,
>  	int upper_margin = mode->vtotal - mode->vsync_end;
>  	int lower_margin = mode->vsync_start - mode->vdisplay;
>  	int vsync_len = mode->vsync_end - mode->vsync_start;
> +	u32 dp0_syncval;
>  
>  	/*
>  	 * Recommended maximum number of symbols transferred in a transfer unit:
> @@ -696,50 +727,69 @@ static int tc_set_video_mode(struct tc_data *tc,
>  	 * assume we do not need any delay when DPI is a source of
>  	 * sync signals
>  	 */
> -	tc_write(VPCTRL0, (0 << 20) /* VSDELAY */ |
> +	tc_write(VPCTRL0,
> +		 FIELD_PREP(VSDELAY, 0) |
>  		 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(HTIM01,
> +		 FIELD_PREP(HBPR, ALIGN(left_margin, 2)) |
> +		 FIELD_PREP(HPW, ALIGN(hsync_len, 2)));
> +	tc_write(HTIM02,
> +		 FIELD_PREP(HDISPR, ALIGN(mode->hdisplay, 2)) |
> +		 FIELD_PREP(HFPR, ALIGN(right_margin, 2)));
> +	tc_write(VTIM01,
> +		 FIELD_PREP(VBPR, upper_margin) |
> +		 FIELD_PREP(VSPR, vsync_len));
> +	tc_write(VTIM02,
> +		 FIELD_PREP(VFPR, lower_margin) |
> +		 FIELD_PREP(VDISPR, mode->vdisplay));
>  	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);
> +		 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));
>  
>  	/* 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));
> +		 FIELD_PREP(THRESH_DLY, max_tu_symbol) |
> +		 FIELD_PREP(VID_SYNC_DLY, vid_sync_dly));
>  
> -	tc_write(DP0_TOTALVAL, (mode->vtotal << 16) | (mode->htotal));
> +	tc_write(DP0_TOTALVAL,
> +		 FIELD_PREP(H_TOTAL, mode->htotal) |
> +		 FIELD_PREP(V_TOTAL, mode->vtotal));
>  
>  	tc_write(DP0_STARTVAL,
> -		 ((upper_margin + vsync_len) << 16) |
> -		 ((left_margin + hsync_len) << 0));
> +		 FIELD_PREP(H_START, left_margin + hsync_len) |
> +		 FIELD_PREP(V_START, upper_margin + vsync_len));
> +
> +	tc_write(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);
> +
> +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> +		dp0_syncval |= SYNCVAL_VS_POL_ACTIVE_LOW;
>  
> -	tc_write(DP0_ACTIVEVAL, (mode->vdisplay << 16) | (mode->hdisplay));
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		dp0_syncval |= SYNCVAL_HS_POL_ACTIVE_LOW;
>  
> -	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(DP0_SYNCVAL, dp0_syncval);
>  
> -	tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
> -		 DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888);
> +	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);
> +	tc_write(DP0_MISC,
> +		 FIELD_PREP(MAX_TU_SYMBOL, max_tu_symbol) |
> +		 FIELD_PREP(TU_SIZE, TU_SIZE_RECOMMENDED) |
> +		 BPC_8);
>  
>  	return 0;
>  err:


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