drm/radeon/kms: fix i2c prescale calc on older radeons

Should fix fdo bug 26430

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 5d93418..f007fcb 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -183,11 +183,10 @@ static void set_data(void *i2c_priv, int data)
 
 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
 {
-       struct radeon_pll *spll = &rdev->clock.spll;
        u32 sclk = radeon_get_engine_clock(rdev);
        u32 prescale = 0;
-       u32 n, m;
-       u8 loop;
+       u32 nm;
+       u8 n, m, loop;
        int i2c_clock;
 
        switch (rdev->family) {
@@ -203,13 +202,15 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
        case CHIP_R300:
        case CHIP_R350:
        case CHIP_RV350:
-               n = (spll->reference_freq) / (4 * 6);
+               i2c_clock = 60;
+               nm = (sclk * 10) / (i2c_clock * 4);
                for (loop = 1; loop < 255; loop++) {
-                       if ((loop * (loop - 1)) > n)
+                       if ((nm / loop) < loop)
                                break;
                }
-               m = loop - 1;
-               prescale = m | (loop << 8);
+               n = loop - 1;
+               m = loop - 2;
+               prescale = m | (n << 8);
                break;
        case CHIP_RV380:
        case CHIP_RS400:
@@ -217,7 +218,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
        case CHIP_R420:
        case CHIP_R423:
        case CHIP_RV410:
-               sclk = radeon_get_engine_clock(rdev);
                prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
                break;
        case CHIP_RS600:
@@ -232,7 +232,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
        case CHIP_RV570:
        case CHIP_R580:
                i2c_clock = 50;
-               sclk = radeon_get_engine_clock(rdev);
                if (rdev->family == CHIP_R520)
                        prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
                else