drm/radeon: add radeon_atom_get_clock_dividers helper

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 135 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index ac614a45b27f..fb1780a28139 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -206,6 +206,11 @@ void radeon_pm_suspend(struct radeon_device *rdev);
 void radeon_pm_resume(struct radeon_device *rdev);
 void radeon_combios_get_power_modes(struct radeon_device *rdev);
 void radeon_atombios_get_power_modes(struct radeon_device *rdev);
+int radeon_atom_get_clock_dividers(struct radeon_device *rdev,
+                                   u8 clock_type,
+                                   u32 clock,
+                                   bool strobe_mode,
+                                   struct atom_clock_dividers *dividers);
 void radeon_atom_set_voltage(struct radeon_device *rdev, u16 voltage_level, u8 voltage_type);
 void rs690_pm_info(struct radeon_device *rdev);
 extern int rv6xx_get_temp(struct radeon_device *rdev);
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index f22eb5713528..8c1779cba1f3 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -2654,6 +2654,113 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                 rdev->pm.current_vddc = 0;
 }
 
+union get_clock_dividers {
+        struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS v1;
+        struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V2 v2;
+        struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V3 v3;
+        struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V4 v4;
+        struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V5 v5;
+};
+
+int radeon_atom_get_clock_dividers(struct radeon_device *rdev,
+                                   u8 clock_type,
+                                   u32 clock,
+                                   bool strobe_mode,
+                                   struct atom_clock_dividers *dividers)
+{
+        union get_clock_dividers args;
+        int index = GetIndexIntoMasterTable(COMMAND, ComputeMemoryEnginePLL);
+        u8 frev, crev;
+
+        memset(&args, 0, sizeof(args));
+        memset(dividers, 0, sizeof(struct atom_clock_dividers));
+
+        if (!atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev))
+                return -EINVAL;
+
+        switch (crev) {
+        case 1:
+                /* r4xx, r5xx */
+                args.v1.ucAction = clock_type;
+                args.v1.ulClock = cpu_to_le32(clock);   /* 10 khz */
+
+                atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+                dividers->post_div = args.v1.ucPostDiv;
+                dividers->fb_div = args.v1.ucFbDiv;
+                dividers->enable_post_div = true;
+                break;
+        case 2:
+        case 3:
+                /* r6xx, r7xx, evergreen, ni */
+                if (rdev->family <= CHIP_RV770) {
+                        args.v2.ucAction = clock_type;
+                        args.v2.ulClock = cpu_to_le32(clock);   /* 10 khz */
+
+                        atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+                        dividers->post_div = args.v2.ucPostDiv;
+                        dividers->fb_div = le16_to_cpu(args.v2.usFbDiv);
+                        dividers->ref_div = args.v2.ucAction;
+                        if (rdev->family == CHIP_RV770) {
+                                dividers->enable_post_div = (le32_to_cpu(args.v2.ulClock) & (1 << 24)) ?
+                                        true : false;
+                                dividers->vco_mode = (le32_to_cpu(args.v2.ulClock) & (1 << 25)) ? 1 : 0;
+                        } else
+                                dividers->enable_post_div = (dividers->fb_div & 1) ? true : false;
+                } else {
+                        if (clock_type == COMPUTE_ENGINE_PLL_PARAM) {
+                                args.v3.ulClock.ulComputeClockFlag = clock_type;
+                                args.v3.ulClock.ulClockFreq = cpu_to_le32(clock);       /* 10 khz */
+
+                                atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+                                dividers->post_div = args.v3.ucPostDiv;
+                                dividers->enable_post_div = (args.v3.ucCntlFlag &
+                                                             ATOM_PLL_CNTL_FLAG_PLL_POST_DIV_EN) ? true : false;
+                                dividers->enable_dithen = (args.v3.ucCntlFlag &
+                                                           ATOM_PLL_CNTL_FLAG_FRACTION_DISABLE) ? false : true;
+                                dividers->fb_div = le16_to_cpu(args.v3.ulFbDiv.usFbDiv);
+                                dividers->frac_fb_div = le16_to_cpu(args.v3.ulFbDiv.usFbDivFrac);
+                                dividers->ref_div = args.v3.ucRefDiv;
+                                dividers->vco_mode = (args.v3.ucCntlFlag &
+                                                      ATOM_PLL_CNTL_FLAG_MPLL_VCO_MODE) ? 1 : 0;
+                        } else {
+                                args.v5.ulClock.ulComputeClockFlag = clock_type;
+                                args.v5.ulClock.ulClockFreq = cpu_to_le32(clock);       /* 10 khz */
+                                if (strobe_mode)
+                                        args.v5.ucInputFlag = ATOM_PLL_INPUT_FLAG_PLL_STROBE_MODE_EN;
+
+                                atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+                                dividers->post_div = args.v5.ucPostDiv;
+                                dividers->enable_post_div = (args.v5.ucCntlFlag &
+                                                             ATOM_PLL_CNTL_FLAG_PLL_POST_DIV_EN) ? true : false;
+                                dividers->enable_dithen = (args.v5.ucCntlFlag &
+                                                           ATOM_PLL_CNTL_FLAG_FRACTION_DISABLE) ? false : true;
+                                dividers->whole_fb_div = le16_to_cpu(args.v5.ulFbDiv.usFbDiv);
+                                dividers->frac_fb_div = le16_to_cpu(args.v5.ulFbDiv.usFbDivFrac);
+                                dividers->ref_div = args.v5.ucRefDiv;
+                                dividers->vco_mode = (args.v5.ucCntlFlag &
+                                                      ATOM_PLL_CNTL_FLAG_MPLL_VCO_MODE) ? 1 : 0;
+                        }
+                }
+                break;
+        case 4:
+                /* fusion */
+                args.v4.ulClock = cpu_to_le32(clock);   /* 10 khz */
+
+                atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+                dividers->post_div = args.v4.ucPostDiv;
+                dividers->real_clock = le32_to_cpu(args.v4.ulClock);
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
 void radeon_atom_set_clock_gating(struct radeon_device *rdev, int enable)
 {
         DYNAMIC_CLOCK_GATING_PS_ALLOCATION args;
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 4003f5a68c09..44e579e75fd0 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -492,6 +492,29 @@ struct radeon_framebuffer {
 #define ENCODER_MODE_IS_DP(em) (((em) == ATOM_ENCODER_MODE_DP) || \
                                 ((em) == ATOM_ENCODER_MODE_DP_MST))
 
+struct atom_clock_dividers {
+        u32 post_div;
+        union {
+                struct {
+#ifdef __BIG_ENDIAN
+                        u32 reserved : 6;
+                        u32 whole_fb_div : 12;
+                        u32 frac_fb_div : 14;
+#else
+                        u32 frac_fb_div : 14;
+                        u32 whole_fb_div : 12;
+                        u32 reserved : 6;
+#endif
+                };
+                u32 fb_div;
+        };
+        u32 ref_div;
+        bool enable_post_div;
+        bool enable_dithen;
+        u32 vco_mode;
+        u32 real_clock;
+};
+
 extern enum radeon_tv_std
 radeon_combios_get_tv_info(struct radeon_device *rdev);
 extern enum radeon_tv_std