From: Rodrigo Siqueira Rodrigo.Siqueira@amd.com
commit 6bdeff12a96c9a5da95c8d11fefd145eb165e32a upstream.
Some old ASICs might not implement/require get_dig_frontend helper; in this scenario, we can have a NULL pointer exception when we try to call it inside vbios disable operation. For example, this situation might happen when using Polaris12 with an eDP panel. This commit avoids this situation by adding a specific get_dig_frontend implementation for DCEx.
Cc: Alex Deucher alexander.deucher@amd.com Cc: Borislav Petkov bp@alien8.de Cc: Harry Wentland Harry.Wentland@amd.com Cc: Nicholas Kazlauskas Nicholas.Kazlauskas@amd.com Cc: Chiawen Huang chiawen.huang@amd.com Reported-and-tested-by: Borislav Petkov bp@suse.de Acked-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c | 44 +++++++++++++++++- drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h | 2 2 files changed, 44 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c @@ -119,7 +119,8 @@ static const struct link_encoder_funcs d .disable_hpd = dce110_link_encoder_disable_hpd, .is_dig_enabled = dce110_is_dig_enabled, .destroy = dce110_link_encoder_destroy, - .get_max_link_cap = dce110_link_encoder_get_max_link_cap + .get_max_link_cap = dce110_link_encoder_get_max_link_cap, + .get_dig_frontend = dce110_get_dig_frontend, };
static enum bp_result link_transmitter_control( @@ -235,6 +236,44 @@ static void set_link_training_complete(
}
+unsigned int dce110_get_dig_frontend(struct link_encoder *enc) +{ + struct dce110_link_encoder *enc110 = TO_DCE110_LINK_ENC(enc); + u32 value; + enum engine_id result; + + REG_GET(DIG_BE_CNTL, DIG_FE_SOURCE_SELECT, &value); + + switch (value) { + case DCE110_DIG_FE_SOURCE_SELECT_DIGA: + result = ENGINE_ID_DIGA; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGB: + result = ENGINE_ID_DIGB; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGC: + result = ENGINE_ID_DIGC; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGD: + result = ENGINE_ID_DIGD; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGE: + result = ENGINE_ID_DIGE; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGF: + result = ENGINE_ID_DIGF; + break; + case DCE110_DIG_FE_SOURCE_SELECT_DIGG: + result = ENGINE_ID_DIGG; + break; + default: + // invalid source select DIG + result = ENGINE_ID_UNKNOWN; + } + + return result; +} + void dce110_link_encoder_set_dp_phy_pattern_training_pattern( struct link_encoder *enc, uint32_t index) @@ -1665,7 +1704,8 @@ static const struct link_encoder_funcs d .disable_hpd = dce110_link_encoder_disable_hpd, .is_dig_enabled = dce110_is_dig_enabled, .destroy = dce110_link_encoder_destroy, - .get_max_link_cap = dce110_link_encoder_get_max_link_cap + .get_max_link_cap = dce110_link_encoder_get_max_link_cap, + .get_dig_frontend = dce110_get_dig_frontend };
void dce60_link_encoder_construct( --- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h @@ -295,6 +295,8 @@ void dce110_link_encoder_connect_dig_be_ enum engine_id engine, bool connect);
+unsigned int dce110_get_dig_frontend(struct link_encoder *enc); + void dce110_link_encoder_set_dp_phy_pattern_training_pattern( struct link_encoder *enc, uint32_t index);