On 2019-10-30 2:04 a.m., Nathan Chancellor wrote:
> Clang warns:
>
> ../drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:2520:42:
> error: implicit conversion from enumeration type 'enum transmitter' to
> different enumeration type 'enum physical_phy_id'
> [-Werror,-Wenum-conversion]
> psr_context->smuPhyId = link->link_enc->transmitter;
> ~ ~~~~~~~~~~~~~~~~^~~~~~~~~~~
> 1 error generated.
>
> As the comment above this assignment states, this is intentional. To
> match previous warnings of this nature, add a conversion function that
> explicitly converts between the enums and warns when there is a
> mismatch.
>
> See commit 828cfa29093f ("drm/amdgpu: Fix amdgpu ras to ta enums
> conversion") and commit d9ec5cfd5a2e ("drm/amd/display: Use switch table
> for dc_to_smu_clock_type") for previous examples of this.
>
> Fixes: e0d08a40a63b ("drm/amd/display: Add debugfs entry for reading psr state")
> Link: https://github.com/ClangBuiltLinux/linux/issues/758
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
With the small nitpick that maybe the default case should be
PHYLD_UNKNOWN, but well get the warning if that happens anyway.
Nicholas Kazlauskas
> ---
> drivers/gpu/drm/amd/display/dc/core/dc_link.c | 38 ++++++++++++++++++-
> 1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> index 7b18087be585..38dfe460e13b 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> @@ -2447,6 +2447,41 @@ bool dc_link_get_psr_state(const struct dc_link *link, uint32_t *psr_state)
> return true;
> }
>
> +static inline enum physical_phy_id
> +transmitter_to_phy_id(enum transmitter transmitter_value)
> +{
> + switch (transmitter_value) {
> + case TRANSMITTER_UNIPHY_A:
> + return PHYLD_0;
> + case TRANSMITTER_UNIPHY_B:
> + return PHYLD_1;
> + case TRANSMITTER_UNIPHY_C:
> + return PHYLD_2;
> + case TRANSMITTER_UNIPHY_D:
> + return PHYLD_3;
> + case TRANSMITTER_UNIPHY_E:
> + return PHYLD_4;
> + case TRANSMITTER_UNIPHY_F:
> + return PHYLD_5;
> + case TRANSMITTER_NUTMEG_CRT:
> + return PHYLD_6;
> + case TRANSMITTER_TRAVIS_CRT:
> + return PHYLD_7;
> + case TRANSMITTER_TRAVIS_LCD:
> + return PHYLD_8;
> + case TRANSMITTER_UNIPHY_G:
> + return PHYLD_9;
> + case TRANSMITTER_COUNT:
> + return PHYLD_COUNT;
> + case TRANSMITTER_UNKNOWN:
> + return PHYLD_UNKNOWN;
> + default:
> + WARN_ONCE(1, "Unknown transmitter value %d\n",
> + transmitter_value);
> + return PHYLD_0;
> + }
> +}
> +
> bool dc_link_setup_psr(struct dc_link *link,
> const struct dc_stream_state *stream, struct psr_config *psr_config,
> struct psr_context *psr_context)
> @@ -2517,7 +2552,8 @@ bool dc_link_setup_psr(struct dc_link *link,
> /* Hardcoded for now. Can be Pcie or Uniphy (or Unknown)*/
> psr_context->phyType = PHY_TYPE_UNIPHY;
> /*PhyId is associated with the transmitter id*/
> - psr_context->smuPhyId = link->link_enc->transmitter;
> + psr_context->smuPhyId =
> + transmitter_to_phy_id(link->link_enc->transmitter);
>
> psr_context->crtcTimingVerticalTotal = stream->timing.v_total;
> psr_context->vsyncRateHz = div64_u64(div64_u64((stream->
>
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