drm/amd/amdgpu: Tidy up SI SMC code (v2)

As well as merge SMC clock functions into one to reduce LOC.

v2: Fix swapped ck enable bit
bug: https://bugs.freedesktop.org/show_bug.cgi?id=97801

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/si_dpm.c

@@ -3944,13 +3944,13 @@ static void si_dpm_start_smc(struct amdgpu_device *adev)
 {
 	si_program_jump_on_start(adev);
 	si_start_smc(adev);
-	si_start_smc_clock(adev);
+	si_smc_clock(adev, true);
 }
 
 static void si_dpm_stop_smc(struct amdgpu_device *adev)
 {
 	si_reset_smc(adev);
-	si_stop_smc_clock(adev);
+	si_smc_clock(adev, false);
 }
 
 static int si_process_firmware_header(struct amdgpu_device *adev)
@@ -4366,7 +4366,7 @@ static int si_upload_firmware(struct amdgpu_device *adev)
 	struct si_power_info *si_pi = si_get_pi(adev);
 
 	si_reset_smc(adev);
-	si_stop_smc_clock(adev);
+	si_smc_clock(adev, false);
 
 	return si_load_smc_ucode(adev, si_pi->sram_end);
 }

drivers/gpu/drm/amd/amdgpu/si_smc.c

@@ -84,7 +84,6 @@ int si_copy_bytes_to_smc(struct amdgpu_device *adev,
 			goto done;
 
 		original_data = RREG32(SMC_IND_DATA_0);
-
 		extra_shift = 8 * (4 - byte_count);
 
 		while (byte_count > 0) {
@@ -94,7 +93,6 @@ int si_copy_bytes_to_smc(struct amdgpu_device *adev,
 		}
 
 		data <<= extra_shift;
-
 		data |= (original_data & ~((~0UL) << extra_shift));
 
 		ret = si_set_smc_sram_address(adev, addr, limit);
@@ -128,8 +126,8 @@ void si_reset_smc(struct amdgpu_device *adev)
 	RREG32(CB_CGTT_SCLK_CTRL);
 	RREG32(CB_CGTT_SCLK_CTRL);
 
-	tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL);
-	tmp |= RST_REG;
+	tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL) |
+	      RST_REG;
 	WREG32_SMC(SMC_SYSCON_RESET_CNTL, tmp);
 }
 
@@ -140,20 +138,14 @@ int si_program_jump_on_start(struct amdgpu_device *adev)
 	return si_copy_bytes_to_smc(adev, 0x0, data, 4, sizeof(data)+1);
 }
 
-void si_stop_smc_clock(struct amdgpu_device *adev)
-{
-	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
-
-	tmp |= CK_DISABLE;
-
-	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
-}
-
-void si_start_smc_clock(struct amdgpu_device *adev)
+void si_smc_clock(struct amdgpu_device *adev, bool enable)
 {
 	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
 
-	tmp &= ~CK_DISABLE;
+	if (enable)
+		tmp &= ~CK_DISABLE;
+	else
+		tmp |= CK_DISABLE;
 
 	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
 }
@@ -185,9 +177,8 @@ PPSMC_Result si_send_msg_to_smc(struct amdgpu_device *adev, PPSMC_Msg msg)
 			break;
 		udelay(1);
 	}
-	tmp = RREG32(SMC_RESP_0);
 
-	return (PPSMC_Result)tmp;
+	return (PPSMC_Result)RREG32(SMC_RESP_0);
 }
 
 PPSMC_Result si_wait_for_smc_inactive(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/sislands_smc.h

@@ -408,8 +408,7 @@ int si_copy_bytes_to_smc(struct amdgpu_device *adev,
 void si_start_smc(struct amdgpu_device *adev);
 void si_reset_smc(struct amdgpu_device *adev);
 int si_program_jump_on_start(struct amdgpu_device *adev);
-void si_stop_smc_clock(struct amdgpu_device *adev);
-void si_start_smc_clock(struct amdgpu_device *adev);
+void si_smc_clock(struct amdgpu_device *adev, bool enable);
 bool si_is_smc_running(struct amdgpu_device *adev);
 PPSMC_Result si_send_msg_to_smc(struct amdgpu_device *adev, PPSMC_Msg msg);
 PPSMC_Result si_wait_for_smc_inactive(struct amdgpu_device *adev);