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drm/amd/amdgpu: enable GUI idle INT after enabling CGCG 

GUI idle interrupts should be enabled only after we
have enabled coarse grain clock gating (CGCG). This
prevents GFX engine generating idle interrupt even
though CGCG is not completely enabled.

Most of the time this goes un-noticed, but on some
Stoney ASICs this results in GFX engine hang after
system resumes from suspend. The issue is not
particular to Stoney though and could have occured
on any ASIC. The patch fixes this issue.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reported-by: Sunil Uttarwar <Sunil.Uttarwar1@amd.com>
Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Arindam Nath 2016-11-25 16:55:16 +05:30 committed by Alex Deucher
parent ecc2cf7cc8
commit dd31ae9ac9
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
View File

@ -5919,29 +5919,24 @@ static void gfx_v8_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
adev->gfx.rlc.funcs->enter_safe_mode(adev);
if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_CGCG)) {
/* 1 enable cntx_empty_int_enable/cntx_busy_int_enable/
* Cmp_busy/GFX_Idle interrupts
*/
gfx_v8_0_enable_gui_idle_interrupt(adev, true);
temp1 = data1 = RREG32(mmRLC_CGTT_MGCG_OVERRIDE);
data1 &= ~RLC_CGTT_MGCG_OVERRIDE__CGCG_MASK;
if (temp1 != data1)
WREG32(mmRLC_CGTT_MGCG_OVERRIDE, data1);
/* 2 wait for RLC_SERDES_CU_MASTER & RLC_SERDES_NONCU_MASTER idle */
/* : wait for RLC_SERDES_CU_MASTER & RLC_SERDES_NONCU_MASTER idle */
gfx_v8_0_wait_for_rlc_serdes(adev);
/* 3 - clear cgcg override */
/* 2 - clear cgcg override */
gfx_v8_0_send_serdes_cmd(adev, BPM_REG_CGCG_OVERRIDE, CLE_BPM_SERDES_CMD);
/* wait for RLC_SERDES_CU_MASTER & RLC_SERDES_NONCU_MASTER idle */
gfx_v8_0_wait_for_rlc_serdes(adev);
/* 4 - write cmd to set CGLS */
/* 3 - write cmd to set CGLS */
gfx_v8_0_send_serdes_cmd(adev, BPM_REG_CGLS_EN, SET_BPM_SERDES_CMD);
/* 5 - enable cgcg */
/* 4 - enable cgcg */
data |= RLC_CGCG_CGLS_CTRL__CGCG_EN_MASK;
if (adev->cg_flags & AMD_CG_SUPPORT_GFX_CGLS) {
@ -5959,6 +5954,11 @@ static void gfx_v8_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
if (temp != data)
WREG32(mmRLC_CGCG_CGLS_CTRL, data);
/* 5 enable cntx_empty_int_enable/cntx_busy_int_enable/
* Cmp_busy/GFX_Idle interrupts
*/
gfx_v8_0_enable_gui_idle_interrupt(adev, true);
} else {
/* disable cntx_empty_int_enable & GFX Idle interrupt */
gfx_v8_0_enable_gui_idle_interrupt(adev, false);