linux-kernel - [PATCH] drm: rcar-du: calculate DPLLCR to be more small jitter

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Date:   Wed, 29 Nov 2017 03:03:47 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>
Cc:     dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm: rcar-du: calculate DPLLCR to be more small jitter


From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

In general, PLL has VCO (= Voltage controlled oscillator),
one of the very important electronic feature called as "jitter"
is related to this VCO.
In academic generalism, VCO should be maximum to be more small jitter.
In high frequency clock, jitter will be large impact.
Thus, selecting Hi VCO is general theory.

   fin                                 fvco        fout      fclkout
in --> [1/M] --> |PD| -> [LPF] -> [VCO] -> [1/P] -+-> [1/FDPLL] -> out
             +-> |  |                             |
             |                                    |
             +-----------------[1/N]<-------------+

	fclkout = fvco / P / FDPLL -- (1)

In PD, it will loop until fin/M = fvco/P/N

	fvco = fin * P *  N / M -- (2)

(1) + (2) indicates, fclkout = fin * N / M / FDPLL
In this device, N = (n + 1), M = (m + 1), P = 2, thus

	fout = fin * (n + 1) / (m + 1) / FDPLL

This is the datasheet formula.
One note here is that it should be 2000 < fvco < 4096MHz
To be smaller jitter, fvco should be maximum,
in other words, N as large as possible, M as small as possible driver
should select. Here, basically M=1.
This patch do it.

Reported-by: HIROSHI INOSE <hiroshi.inose.rb@...esas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 36 ++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index b492063..45540fe 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -125,8 +125,40 @@ static void rcar_du_dpll_divider(struct rcar_du_crtc *rcrtc,
 	unsigned int m;
 	unsigned int n;
 
-	for (n = 39; n < 120; n++) {
-		for (m = 0; m < 4; m++) {
+	/*
+	 *   fin                                 fvco        fout       fclkout
+	 * in --> [1/M] --> |PD| -> [LPF] -> [VCO] -> [1/P] -+-> [1/FDPLL] -> out
+	 *              +-> |  |                             |
+	 *              |                                    |
+	 *              +-----------------[1/N]<-------------+
+	 *
+	 *	fclkout = fvco / P / FDPLL -- (1)
+	 *
+	 * fin/M = fvco/P/N
+	 *
+	 *	fvco = fin * P *  N / M -- (2)
+	 *
+	 * (1) + (2) indicates
+	 *
+	 *	fclkout = fin * N / M / FDPLL
+	 *
+	 * NOTES
+	 *	N = (n + 1), M = (m + 1), P = 2
+	 *	2000 < fvco < 4096Mhz
+	 *	Basically M=1
+	 *
+	 * To be small jitter,
+	 * N : as large as possible
+	 * M : as small as possible
+	 */
+	for (m = 0; m < 4; m++) {
+		for (n = 119; n > 40; n--) {
+			unsigned long long fvco = input * 2 * (n + 1) / (m + 1);
+
+			if ((fvco < 2000) ||
+			    (fvco > 4096000000ll))
+				continue;
+
 			for (fdpll = 1; fdpll < 32; fdpll++) {
 				unsigned long output;
 
-- 
1.9.1