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drm/radeon/dpm: add debugfs support for RS780/RS880 (v3) 

This allows you to look at the current DPM state via
debugfs.

Due to the way the hardware works on these asics, there's
no way to look up exactly what power state we are in, so
we make the best guess we can based on the current sclk.

v2: Anthoine's version
v3: fix ref div

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-07-02 13:05:23 -04:00
parent f90555cbe6
commit 444bddc4b9
4 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/radeon/radeon_asic.c
View File

@ -1270,6 +1270,7 @@ static struct radeon_asic rs780_asic = {
.get_sclk = &rs780_dpm_get_sclk,
.get_mclk = &rs780_dpm_get_mclk,
.print_power_state = &rs780_dpm_print_power_state,
.debugfs_print_current_performance_level = &rs780_dpm_debugfs_print_current_performance_level,
},
.pflip = {
.pre_page_flip = &rs600_pre_page_flip,

2
drivers/gpu/drm/radeon/radeon_asic.h
View File

@ -433,6 +433,8 @@ u32 rs780_dpm_get_sclk(struct radeon_device *rdev, bool low);
u32 rs780_dpm_get_mclk(struct radeon_device *rdev, bool low);
void rs780_dpm_print_power_state(struct radeon_device *rdev,
struct radeon_ps *ps);
void rs780_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
struct seq_file *m);
/* uvd */
int r600_uvd_init(struct radeon_device *rdev);

25
drivers/gpu/drm/radeon/rs780_dpm.c
View File

@ -28,6 +28,7 @@
#include "r600_dpm.h"
#include "rs780_dpm.h"
#include "atom.h"
#include <linux/seq_file.h>
static struct igp_ps *rs780_get_ps(struct radeon_ps *rps)
{
@ -961,3 +962,27 @@ u32 rs780_dpm_get_mclk(struct radeon_device *rdev, bool low)
return pi->bootup_uma_clk;
}
void rs780_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
struct seq_file *m)
{
struct radeon_ps *rps = rdev->pm.dpm.current_ps;
struct igp_ps *ps = rs780_get_ps(rps);
u32 current_fb_div = RREG32(FVTHROT_STATUS_REG0) & CURRENT_FEEDBACK_DIV_MASK;
u32 func_cntl = RREG32(CG_SPLL_FUNC_CNTL);
u32 ref_div = ((func_cntl & SPLL_REF_DIV_MASK) >> SPLL_REF_DIV_SHIFT) + 1;
u32 post_div = ((func_cntl & SPLL_SW_HILEN_MASK) >> SPLL_SW_HILEN_SHIFT) + 1 +
((func_cntl & SPLL_SW_LOLEN_MASK) >> SPLL_SW_LOLEN_SHIFT) + 1;
u32 sclk = (rdev->clock.spll.reference_freq * current_fb_div) /
(post_div * ref_div);
seq_printf(m, "uvd vclk: %d dclk: %d\n", rps->vclk, rps->dclk);
/* guess based on the current sclk */
if (sclk < (ps->sclk_low + 500))
seq_printf(m, "power level 0 sclk: %u vddc_index: %d\n",
ps->sclk_low, ps->min_voltage);
else
seq_printf(m, "power level 1 sclk: %u vddc_index: %d\n",
ps->sclk_high, ps->max_voltage);
}

3
drivers/gpu/drm/radeon/rs780d.h
View File

@ -28,6 +28,7 @@
# define SPLL_SLEEP (1 << 1)
# define SPLL_REF_DIV(x) ((x) << 2)
# define SPLL_REF_DIV_MASK (7 << 2)
# define SPLL_REF_DIV_SHIFT 2
# define SPLL_FB_DIV(x) ((x) << 5)
# define SPLL_FB_DIV_MASK (0xff << 2)
# define SPLL_FB_DIV_SHIFT 2
@ -36,8 +37,10 @@
# define SPLL_PULSENUM_MASK (3 << 14)
# define SPLL_SW_HILEN(x) ((x) << 16)
# define SPLL_SW_HILEN_MASK (0xf << 16)
# define SPLL_SW_HILEN_SHIFT 16
# define SPLL_SW_LOLEN(x) ((x) << 20)
# define SPLL_SW_LOLEN_MASK (0xf << 20)
# define SPLL_SW_LOLEN_SHIFT 20
# define SPLL_DIVEN (1 << 24)
# define SPLL_BYPASS_EN (1 << 25)
# define SPLL_CHG_STATUS (1 << 29)