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Radeon: More PLL finetuning

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This commit is contained in:
fritsch 2014-04-16 19:29:59 +02:00
parent 49aa69bf98
commit aa95d7a9f7
2 changed files with 110 additions and 0 deletions
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53
packages/linux/patches/3.14.1/linux-997-02-drm-radeon-more-pll-bits.patch vendored Normal file
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@ -0,0 +1,53 @@
From 19de393134c00989b5b1cc5e6dd4ed444a897ace Mon Sep 17 00:00:00 2001
From: Christian König <christian.koenig@amd.com>
Date: Wed, 16 Apr 2014 09:54:21 +0000
Subject: drm/radeon: improve PLL params if we don't match exactly
Otherwise we might be quite off on older chipsets.
Signed-off-by: Christian König <christian.koenig@amd.com>
---
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 2f42912..fb3b505 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -865,7 +865,7 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
unsigned post_div_min, post_div_max, post_div;
unsigned ref_div_min, ref_div_max, ref_div;
unsigned post_div_best, diff_best;
- unsigned nom, den, tmp;
+ unsigned nom, den;
/* determine allowed feedback divider range */
fb_div_min = pll->min_feedback_div;
@@ -941,22 +941,23 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
ref_div_max = min(210 / post_div, ref_div_max);
/* get matching reference and feedback divider */
- ref_div = max(den / post_div, 1u);
- fb_div = nom;
+ ref_div = DIV_ROUND_CLOSEST(den, post_div);
+ fb_div = DIV_ROUND_CLOSEST(nom * ref_div * post_div, den);
/* we're almost done, but reference and feedback
divider might be to large now */
- tmp = ref_div;
+ nom = fb_div;
+ den = ref_div;
if (fb_div > fb_div_max) {
- ref_div = ref_div * fb_div_max / fb_div;
+ ref_div = DIV_ROUND_CLOSEST(den * fb_div_max, nom);
fb_div = fb_div_max;
}
if (ref_div > ref_div_max) {
ref_div = ref_div_max;
- fb_div = nom * ref_div_max / tmp;
+ fb_div = DIV_ROUND_CLOSEST(nom * ref_div_max, den);
}
/* reduce the numbers to a simpler ratio once more */
--
cgit v0.9.0.2-2-gbebe

57
packages/linux/patches/3.14.1/linux-997-03-drm-radeon-more-pll-bits-more-logging.patch vendored Normal file
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@ -0,0 +1,57 @@
Signed-off-by: Christian König <christian.koenig@amd.com>
---
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index fb3b505..037db45 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -820,6 +820,9 @@ static void avivo_reduce_ratio(unsigned *nom, unsigned *den,
{
unsigned tmp;
+ DRM_DEBUG_KMS("nom: %d den: %d nom_min %d den_min %d\n",
+ *nom, *den, nom_min, den_min);
+
/* reduce the numbers to a simpler ratio */
tmp = gcd(*nom, *den);
*nom /= tmp;
@@ -876,6 +879,9 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
fb_div_max *= 10;
}
+ DRM_DEBUG_KMS("fb_div_min: %d fb_div_max: %d\n",
+ fb_div_min, fb_div_max);
+
/* determine allowed ref divider range */
if (pll->flags & RADEON_PLL_USE_REF_DIV)
ref_div_min = pll->reference_div;
@@ -883,6 +889,9 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
ref_div_min = pll->min_ref_div;
ref_div_max = pll->max_ref_div;
+ DRM_DEBUG_KMS("ref_div_min: %d ref_div_max: %d\n",
+ ref_div_min, ref_div_max);
+
/* determine allowed post divider range */
if (pll->flags & RADEON_PLL_USE_POST_DIV) {
post_div_min = pll->post_div;
@@ -912,6 +921,9 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
post_div_max = pll->max_post_div;
}
+ DRM_DEBUG_KMS("post_div_min: %d post_div_max: %d\n",
+ post_div_min, post_div_max);
+
/* represent the searched ratio as fractional number */
nom = pll->flags & RADEON_PLL_USE_FRAC_FB_DIV ? freq : freq / 10;
den = pll->reference_freq;
@@ -980,7 +992,7 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
*post_div_p = post_div;
DRM_DEBUG_KMS("%d - %d, pll dividers - fb: %d.%d ref: %d, post %d\n",
- freq, *dot_clock_p, *fb_div_p, *frac_fb_div_p,
+ freq, *dot_clock_p * 10, *fb_div_p, *frac_fb_div_p,
ref_div, post_div);
}
--
cgit v0.9.0.2-2-gbebe