From b6ec5c6ef2c06f9f6d9f4075175b40c87666e29b Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Wed, 14 Jul 2021 16:22:32 +0200
Subject: drm/mgag200: Introduce separate variable for PLL S parameter
Git-commit: d9d992238a5aaf1a1e2ba013dd37dccf7b48c0a7
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
The S parameter is controls the loop filter bandwidth when programming
the PLL. It's currently stored as part of P (i.e., the clock divider.)
Add a separate variable for S prepares the PLL code for further
refactoring. The value of s is currently 0, so it has not yet an effect
on the programming.
v2:
* add a note on the current value of s to commit message
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210714142240.21979-6-tzimmermann@suse.de
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/mgag200/mgag200_mode.c | 36 ++++++++++++--------------
1 file changed, 16 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index c9eb044bcb7d..6085d807bb20 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -208,18 +208,17 @@ static int mgag200_compute_pixpll_values_g200se(struct mga_device *mdev, long cl
unsigned int vcomax, vcomin, pllreffreq;
unsigned int delta, tmpdelta, permitteddelta;
unsigned int testp, testm, testn;
- unsigned int p, m, n;
+ unsigned int p, m, n, s;
unsigned int computed;
unsigned int fvv;
unsigned int i;
- if (unique_rev_id <= 0x03) {
+ m = n = p = s = 0;
- m = n = p = 0;
+ if (unique_rev_id <= 0x03) {
vcomax = 320000;
vcomin = 160000;
pllreffreq = 25000;
-
delta = 0xffffffff;
permitteddelta = clock * 5 / 1000;
@@ -247,9 +246,6 @@ static int mgag200_compute_pixpll_values_g200se(struct mga_device *mdev, long cl
}
}
} else {
-
-
- m = n = p = 0;
vcomax = 1600000;
vcomin = 800000;
pllreffreq = 25000;
@@ -310,7 +306,7 @@ static int mgag200_compute_pixpll_values_g200se(struct mga_device *mdev, long cl
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
- pixpllc->s = 0;
+ pixpllc->s = s;
return 0;
}
@@ -344,10 +340,10 @@ static int mgag200_compute_pixpll_values_g200wb(struct mga_device *mdev, long cl
unsigned int vcomax, vcomin, pllreffreq;
unsigned int delta, tmpdelta;
unsigned int testp, testm, testn, testp2;
- unsigned int p, m, n;
+ unsigned int p, m, n, s;
unsigned int computed;
- m = n = p = 0;
+ m = n = p = s = 0;
delta = 0xffffffff;
@@ -421,7 +417,7 @@ static int mgag200_compute_pixpll_values_g200wb(struct mga_device *mdev, long cl
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
- pixpllc->s = 0;
+ pixpllc->s = s;
return 0;
}
@@ -542,10 +538,10 @@ static int mgag200_compute_pixpll_values_g200ev(struct mga_device *mdev, long cl
unsigned int vcomax, vcomin, pllreffreq;
unsigned int delta, tmpdelta;
unsigned int testp, testm, testn;
- unsigned int p, m, n;
+ unsigned int p, m, n, s;
unsigned int computed;
- m = n = p = 0;
+ m = n = p = s = 0;
vcomax = 550000;
vcomin = 150000;
pllreffreq = 50000;
@@ -579,7 +575,7 @@ static int mgag200_compute_pixpll_values_g200ev(struct mga_device *mdev, long cl
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
- pixpllc->s = 0;
+ pixpllc->s = s;
return 0;
}
@@ -652,10 +648,10 @@ static int mgag200_compute_pixpll_values_g200eh(struct mga_device *mdev, long cl
unsigned int vcomax, vcomin, pllreffreq;
unsigned int delta, tmpdelta;
unsigned int testp, testm, testn;
- unsigned int p, m, n;
+ unsigned int p, m, n, s;
unsigned int computed;
- m = n = p = 0;
+ m = n = p = s = 0;
if (mdev->type == G200_EH3) {
vcomax = 3000000;
@@ -727,7 +723,7 @@ static int mgag200_compute_pixpll_values_g200eh(struct mga_device *mdev, long cl
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
- pixpllc->s = 0;
+ pixpllc->s = s;
return 0;
}
@@ -801,10 +797,10 @@ static int mgag200_compute_pixpll_values_g200er(struct mga_device *mdev, long cl
unsigned int vcomax, vcomin, pllreffreq;
unsigned int delta, tmpdelta;
int testr, testn, testm, testo;
- unsigned int p, m, n;
+ unsigned int p, m, n, s;
unsigned int computed, vco;
- m = n = p = 0;
+ m = n = p = s = 0;
vcomax = 1488000;
vcomin = 1056000;
pllreffreq = 48000;
@@ -846,7 +842,7 @@ static int mgag200_compute_pixpll_values_g200er(struct mga_device *mdev, long cl
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
- pixpllc->s = 0;
+ pixpllc->s = s;
return 0;
}
--
2.38.1