<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> [AMD Official Use Only - Internal Distribution Only] <div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Acked-by: Alex Deucher <alexander.deucher@amd.com> </div> <div id="appendonsend"></div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr">From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> on behalf of Xiaomeng Hou <Xiaomeng.Hou@amd.com> Sent: Thursday, December 10, 2020 7:59 AM To: amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org> Cc: Gao, Likun <Likun.Gao@amd.com>; Huang, Ray <Ray.Huang@amd.com>; Hou, Xiaomeng (Matthew) <Xiaomeng.Hou@amd.com> Subject: [PATCH] drm/amdgpu/sdma5.2: soft reset sdma blocks before setup and start sdma <div> </div> </div> <div class="BodyFragment"> <div class="PlainText">Without doing the soft reset, register mmSDMA0_GFX_RB_WPTR's value could not be reset to 0 when sdma block resumes. That would cause the ring buffer's read and write pointers not equal and ring test fail. So add the soft reset step. Signed-off-by: Xiaomeng Hou <Xiaomeng.Hou@amd.com> --- drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 39 +++++++++++++++++++++----- 1 file changed, 32 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c index 39e17aae655f..5acc1e589672 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c @@ -807,6 +807,37 @@ static int sdma_v5_2_load_microcode(struct amdgpu_device *adev) return 0; } +static int sdma_v5_2_soft_reset(void *handle) +{ + struct amdgpu_device *adev = (struct amdgpu_device *)handle; + u32 grbm_soft_reset = 0; + u32 tmp; + int i; + + for (i = 0; i < adev->sdma.num_instances; i++) { + grbm_soft_reset = REG_SET_FIELD(grbm_soft_reset, + GRBM_SOFT_RESET, SOFT_RESET_SDMA0, + 1); + grbm_soft_reset <<= i; + + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + tmp |= grbm_soft_reset; + DRM_DEBUG("GRBM_SOFT_RESET=0x%08X\n", tmp); + WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, tmp); + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + + udelay(50); + + tmp &= ~grbm_soft_reset; + WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, tmp); + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + + udelay(50); + } + + return 0; +} + /** * sdma_v5_2_start - setup and start the async dma engines * @@ -838,6 +869,7 @@ static int sdma_v5_2_start(struct amdgpu_device *adev) msleep(1000); } + sdma_v5_2_soft_reset(adev); /* unhalt the MEs */ sdma_v5_2_enable(adev, true); /* enable sdma ring preemption */ @@ -1366,13 +1398,6 @@ static int sdma_v5_2_wait_for_idle(void *handle) return -ETIMEDOUT; } -static int sdma_v5_2_soft_reset(void *handle) -{ - /* todo */ - - return 0; -} - static int sdma_v5_2_ring_preempt_ib(struct amdgpu_ring *ring) { int i, r = 0; -- 2.17.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org <a href="https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=04%7C01%7Calexander.deucher%40amd.com%7Cc7ed271775544123bb2208d89d0b9af3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637432020727843101%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=JueaOw9nYtG2XJj1se7uYlKZomuBTa8NnGeVVZzC9Tw%3D&reserved=0">https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=04%7C01%7Calexander.deucher%40amd.com%7Cc7ed271775544123bb2208d89d0b9af3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637432020727843101%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=JueaOw9nYtG2XJj1se7uYlKZomuBTa8NnGeVVZzC9Tw%3D&reserved=0</a> </div> </div> </div> </body> </html>