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| author | Imre Deak <imre.deak@intel.com> | 2020-08-05 18:00:56 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2020-08-17 16:17:03 -0400 |
| commit | 05e31dd78e26d8c4d9d0dd68addead8d19c367c2 (patch) | |
| tree | 1bcd0387b7961ab5d082858e4dad2e9124980c57 /drivers/gpu/drm/i915 | |
| parent | b302a2e68807604af2a5015816c1d117747989b6 (diff) | |
| download | linux-stable-05e31dd78e26d8c4d9d0dd68addead8d19c367c2.tar.gz linux-stable-05e31dd78e26d8c4d9d0dd68addead8d19c367c2.tar.bz2 linux-stable-05e31dd78e26d8c4d9d0dd68addead8d19c367c2.zip | |
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: Nivedita Swaminathan <nivedita.swaminathan@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200805150056.24248-1-imre.deak@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_power.c | 10 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 4 |
2 files changed, 7 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c index 3c800aa9cf3f..7946c6af4b1e 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -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 @@ -3951,8 +3952,7 @@ tgl_tc_cold_request(struct drm_i915_private *i915, bool block) if (++tries == 3) break; - if (ret == -EAGAIN) - msleep(1); + msleep(1); } if (ret) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 2b403df03404..e85c6fc1f3cb 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -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 |