From: Rodrigo Siqueira Rodrigo.Siqueira@amd.com

When run igt@kms_vrr in a device that uses DCN2.1 architecture, we noticed multiple failures. Furthermore, when we tested a VRR demo, we noticed a system hang where the mouse pointer still works, but the entire system freezes; in this case, we don't see any dmesg warning or failure messages kernel. This happens due to a lack of vupdate_no_lock interrupt, making the userspace wait eternally to get the event back. For fixing this issue, we need to add the vupdate_no_lock interrupt in the interrupt list.

Cc: stable@vger.kernel.org Signed-off-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Acked-by: Bindu Ramamurthy bindu.r@amd.com --- .../display/dc/irq/dcn21/irq_service_dcn21.c | 22 +++++++++++++++++++ 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/irq/dcn21/irq_service_dcn21.c b/drivers/gpu/drm/amd/display/dc/irq/dcn21/irq_service_dcn21.c index 1b971265418b..0e0f494fbb5e 100644 --- a/drivers/gpu/drm/amd/display/dc/irq/dcn21/irq_service_dcn21.c +++ b/drivers/gpu/drm/amd/display/dc/irq/dcn21/irq_service_dcn21.c @@ -168,6 +168,11 @@ static const struct irq_source_info_funcs vblank_irq_info_funcs = { .ack = NULL };

+static const struct irq_source_info_funcs vupdate_no_lock_irq_info_funcs = { + .set = NULL, + .ack = NULL +}; + #undef BASE_INNER #define BASE_INNER(seg) DMU_BASE__INST0_SEG ## seg

@@ -230,6 +235,17 @@ static const struct irq_source_info_funcs vblank_irq_info_funcs = { .funcs = &vblank_irq_info_funcs\ }

+/* vupdate_no_lock_int_entry maps to DC_IRQ_SOURCE_VUPDATEx, to match semantic + * of DCE's DC_IRQ_SOURCE_VUPDATEx. + */ +#define vupdate_no_lock_int_entry(reg_num)\ + [DC_IRQ_SOURCE_VUPDATE1 + reg_num] = {\ + IRQ_REG_ENTRY(OTG, reg_num,\ + OTG_GLOBAL_SYNC_STATUS, VUPDATE_NO_LOCK_INT_EN,\ + OTG_GLOBAL_SYNC_STATUS, VUPDATE_NO_LOCK_EVENT_CLEAR),\ + .funcs = &vupdate_no_lock_irq_info_funcs\ + } + #define vblank_int_entry(reg_num)\ [DC_IRQ_SOURCE_VBLANK1 + reg_num] = {\ IRQ_REG_ENTRY(OTG, reg_num,\ @@ -338,6 +354,12 @@ irq_source_info_dcn21[DAL_IRQ_SOURCES_NUMBER] = { vupdate_int_entry(3), vupdate_int_entry(4), vupdate_int_entry(5), + vupdate_no_lock_int_entry(0), + vupdate_no_lock_int_entry(1), + vupdate_no_lock_int_entry(2), + vupdate_no_lock_int_entry(3), + vupdate_no_lock_int_entry(4), + vupdate_no_lock_int_entry(5), vblank_int_entry(0), vblank_int_entry(1), vblank_int_entry(2),