From: Pallavi G <pallavi.g at intel.com>
For high res modes m n p calculation is fixed for VLV platform.
v2: use 64 bit types and math (Ville)
Signed-off-by: Pallavi G <pallavi.g at intel.com>
Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman at intel.com>
Signed-off-by: Yogesh M <yogesh.mohan.marimuthu at intel.com>
Signed-off-by: Gajanan Bhat <gajanan.bhat at intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 25 +++++++++++++++----------
1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9cb0b53..5cc12dc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -31,6 +31,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
+#include <linux/math64.h>
#include <drm/drm_edid.h>
#include <drm/drmP.h>
#include "intel_drv.h"
@@ -396,21 +397,21 @@ static const intel_limit_t intel_limits_vlv_dac = {
.m1 = { .min = 2, .max = 3 },
.m2 = { .min = 11, .max = 156 },
.p = { .min = 10, .max = 30 },
- .p1 = { .min = 2, .max = 3 },
+ .p1 = { .min = 1, .max = 3 },
.p2 = { .dot_limit = 270000,
.p2_slow = 2, .p2_fast = 20 },
.find_pll = intel_vlv_find_best_pll,
};
static const intel_limit_t intel_limits_vlv_hdmi = {
- .dot = { .min = 20000, .max = 165000 },
- .vco = { .min = 4000000, .max = 5994000},
- .n = { .min = 1, .max = 7 },
+ .dot = { .min = 25000, .max = 180000 },
+ .vco = { .min = 4040000, .max = 5960000 },
+ .n = { .min = 1, .max = 5 },
.m = { .min = 60, .max = 300 }, /* guess */
.m1 = { .min = 2, .max = 3 },
- .m2 = { .min = 11, .max = 156 },
+ .m2 = { .min = 15, .max = 149 },
.p = { .min = 10, .max = 30 },
- .p1 = { .min = 2, .max = 3 },
+ .p1 = { .min = 1, .max = 3 },
.p2 = { .dot_limit = 270000,
.p2_slow = 2, .p2_fast = 20 },
.find_pll = intel_vlv_find_best_pll,
@@ -424,7 +425,7 @@ static const intel_limit_t intel_limits_vlv_dp = {
.m1 = { .min = 2, .max = 3 },
.m2 = { .min = 11, .max = 156 },
.p = { .min = 10, .max = 30 },
- .p1 = { .min = 2, .max = 3 },
+ .p1 = { .min = 1, .max = 3 },
.p2 = { .dot_limit = 270000,
.p2_slow = 2, .p2_fast = 20 },
.find_pll = intel_vlv_find_best_pll,
@@ -822,10 +823,13 @@ intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
int target, int refclk, intel_clock_t *match_clock,
intel_clock_t *best_clock)
{
+#define LONG_OVERFLOW 0x7FFFFFFF
+#define DIFF_OVERFLOW (LONG_OVERFLOW/10000)
+
u32 p1, p2, m1, m2, vco, bestn, bestm1, bestm2, bestp1, bestp2;
u32 m, n, fastclk;
u32 updrate, minupdate, fracbits, p;
- unsigned long bestppm, ppm, absppm;
+ s64 bestppm, ppm, absppm, ppmdiff;
int dotclk, flag;
flag = 0;
@@ -854,8 +858,9 @@ intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
m = m1 * m2;
vco = updrate * m;
if (vco >= limit->vco.min && vco < limit->vco.max) {
- ppm = 1000000 * ((vco / p) - fastclk) / fastclk;
- absppm = (ppm > 0) ? ppm : (-ppm);
+ ppmdiff = div_s64((100*vco), p) - (100*fastclk);
+ absppm = div_s64((abs64(ppmdiff)*10000), fastclk);
+
if (absppm < 100 && ((p1 * p2) > (bestp1 * bestp2))) {
bestppm = 0;
flag = 1;
--
1.7.10.4
