drm/radeon: fix dram timing for certain hawaii boards

Certain memory configurations need a fix.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 893ed68..4dd8f35 100644 (file)
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -2071,6 +2071,33 @@ static int ci_force_switch_to_arb_f0(struct radeon_device *rdev)
        return ni_copy_and_switch_arb_sets(rdev, tmp, MC_CG_ARB_FREQ_F0);
 }
 
+static void ci_register_patching_mc_arb(struct radeon_device *rdev,
+                                       const u32 engine_clock,
+                                       const u32 memory_clock,
+                                       u32 *dram_timimg2)
+{
+       bool patch;
+       u32 tmp, tmp2;
+
+       tmp = RREG32(MC_SEQ_MISC0);
+       patch = ((tmp & 0x0000f00) == 0x300) ? true : false;
+
+       if (patch &&
+           ((rdev->pdev->device == 0x67B0) ||
+            (rdev->pdev->device == 0x67B1))) {
+               if ((memory_clock > 100000) && (memory_clock <= 125000)) {
+                       tmp2 = (((0x31 * engine_clock) / 125000) - 1) & 0xff;
+                       *dram_timimg2 &= ~0x00ff0000;
+                       *dram_timimg2 |= tmp2 << 16;
+               } else if ((memory_clock > 125000) && (memory_clock <= 137500)) {
+                       tmp2 = (((0x36 * engine_clock) / 137500) - 1) & 0xff;
+                       *dram_timimg2 &= ~0x00ff0000;
+                       *dram_timimg2 |= tmp2 << 16;
+               }
+       }
+}
+
+
 static int ci_populate_memory_timing_parameters(struct radeon_device *rdev,
                                                u32 sclk,
                                                u32 mclk,
@@ -2086,6 +2113,8 @@ static int ci_populate_memory_timing_parameters(struct radeon_device *rdev,
        dram_timing2 = RREG32(MC_ARB_DRAM_TIMING2);
        burst_time = RREG32(MC_ARB_BURST_TIME) & STATE0_MASK;
 
+       ci_register_patching_mc_arb(rdev, sclk, mclk, &dram_timing2);
+
        arb_regs->McArbDramTiming  = cpu_to_be32(dram_timing);
        arb_regs->McArbDramTiming2 = cpu_to_be32(dram_timing2);
        arb_regs->McArbBurstTime = (u8)burst_time;