Commit 05e31dd7 authored by Imre Deak's avatar Imre Deak Committed by Rodrigo Vivi

drm/i915/tgl: Fix TC-cold block/unblock sequence

The command register is the PCODE MBOX low register not the high one as
described by the spec. This left the system with the TC-cold power state
being blocked all the time. Fix things by using the correct register.

Also to make sure we retry a request for at least 600usec, when the
PCODE MBOX command itself succeeded, but the TC-cold block command
failed, sleep for 1msec unconditionally after any fail.

The change was tested with JTAG register read of the HW/FW's actual
TC-cold state, which reported the expected states after this change.
Tested-by: default avatarNivedita Swaminathan <nivedita.swaminathan@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarJosé Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200805150056.24248-1-imre.deak@intel.comSigned-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
parent b302a2e6
......@@ -3927,12 +3927,13 @@ tgl_tc_cold_request(struct drm_i915_private *i915, bool block)
int ret;
while (1) {
u32 low_val = 0, high_val;
u32 low_val;
u32 high_val = 0;
if (block)
high_val = TGL_PCODE_EXIT_TCCOLD_DATA_H_BLOCK_REQ;
low_val = TGL_PCODE_EXIT_TCCOLD_DATA_L_BLOCK_REQ;
else
high_val = TGL_PCODE_EXIT_TCCOLD_DATA_H_UNBLOCK_REQ;
low_val = TGL_PCODE_EXIT_TCCOLD_DATA_L_UNBLOCK_REQ;
/*
* Spec states that we should timeout the request after 200us
......@@ -3951,7 +3952,6 @@ tgl_tc_cold_request(struct drm_i915_private *i915, bool block)
if (++tries == 3)
break;
if (ret == -EAGAIN)
msleep(1);
}
......
......@@ -9226,8 +9226,8 @@ enum {
#define DISPLAY_IPS_CONTROL 0x19
#define TGL_PCODE_TCCOLD 0x26
#define TGL_PCODE_EXIT_TCCOLD_DATA_L_EXIT_FAILED REG_BIT(0)
#define TGL_PCODE_EXIT_TCCOLD_DATA_H_BLOCK_REQ 0
#define TGL_PCODE_EXIT_TCCOLD_DATA_H_UNBLOCK_REQ REG_BIT(0)
#define TGL_PCODE_EXIT_TCCOLD_DATA_L_BLOCK_REQ 0
#define TGL_PCODE_EXIT_TCCOLD_DATA_L_UNBLOCK_REQ REG_BIT(0)
/* See also IPS_CTL */
#define IPS_PCODE_CONTROL (1 << 30)
#define HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL 0x1A
......
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