diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c index f2e20666c9c1..4eaec446b49d 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c @@ -80,12 +80,17 @@ static void amdgpu_pll_reduce_ratio(unsigned *nom, unsigned *den, * Calculate feedback and reference divider for a given post divider. Makes * sure we stay within the limits. */ -static void amdgpu_pll_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_div, - unsigned fb_div_max, unsigned ref_div_max, - unsigned *fb_div, unsigned *ref_div) +static void amdgpu_pll_get_fb_ref_div(struct amdgpu_device *adev, unsigned int nom, + unsigned int den, unsigned int post_div, + unsigned int fb_div_max, unsigned int ref_div_max, + unsigned int *fb_div, unsigned int *ref_div) { + /* limit reference * post divider to a maximum */ - ref_div_max = min(128 / post_div, ref_div_max); + if (adev->family == AMDGPU_FAMILY_SI) + ref_div_max = min(100 / post_div, ref_div_max); + else + ref_div_max = min(128 / post_div, ref_div_max); /* get matching reference and feedback divider */ *ref_div = min(max(DIV_ROUND_CLOSEST(den, post_div), 1u), ref_div_max); @@ -112,7 +117,8 @@ static void amdgpu_pll_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_ * Try to calculate the PLL parameters to generate the given frequency: * dot_clock = (ref_freq * feedback_div) / (ref_div * post_div) */ -void amdgpu_pll_compute(struct amdgpu_pll *pll, +void amdgpu_pll_compute(struct amdgpu_device *adev, + struct amdgpu_pll *pll, u32 freq, u32 *dot_clock_p, u32 *fb_div_p, @@ -199,7 +205,7 @@ void amdgpu_pll_compute(struct amdgpu_pll *pll, for (post_div = post_div_min; post_div <= post_div_max; ++post_div) { unsigned diff; - amdgpu_pll_get_fb_ref_div(nom, den, post_div, fb_div_max, + amdgpu_pll_get_fb_ref_div(adev, nom, den, post_div, fb_div_max, ref_div_max, &fb_div, &ref_div); diff = abs(target_clock - (pll->reference_freq * fb_div) / (ref_div * post_div)); @@ -214,7 +220,7 @@ void amdgpu_pll_compute(struct amdgpu_pll *pll, post_div = post_div_best; /* get the feedback and reference divider for the optimal value */ - amdgpu_pll_get_fb_ref_div(nom, den, post_div, fb_div_max, ref_div_max, + amdgpu_pll_get_fb_ref_div(adev, nom, den, post_div, fb_div_max, ref_div_max, &fb_div, &ref_div); /* reduce the numbers to a simpler ratio once more */ |