On Thu, Aug 05, 2021 at 09:05:29PM +0200, Robert Foss wrote:
> Hey Xin,
>
> Thanks for submitting this.
>
> On Thu, 5 Aug 2021 at 09:31, Xin Ji <xji@xxxxxxxxxxxxxxxx> wrote:
> >
> > IVO panel require less input video clock variation than video clock
> > variation in DP CTS spec.
> >
> > This patch decreases the K value of ANX7625 which will shrink eDP Tx
> > video clock variation to meet IVO panel's requirement.
> >
> > Signed-off-by: Xin Ji <xji@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/bridge/analogix/anx7625.c | 17 ++++++++++++++---
> > drivers/gpu/drm/bridge/analogix/anx7625.h | 4 +++-
> > 2 files changed, 17 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > index a3d82377066b..ceed1c7f3f28 100644
> > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > @@ -384,6 +384,18 @@ static int anx7625_odfc_config(struct anx7625_data *ctx,
> > return ret;
> > }
> >
> > +static int anx7625_set_k_value(struct anx7625_data *ctx)
>
> Pardon my ignorance, but I don't know what a K-value is. Could you add
> a comment detailing
> what the K-value does?
Hi Robert Foss, OK, I'll add more comment.
Thanks,
Xin
>
> > +{
> > + struct edid *edid = (struct edid *)ctx->slimport_edid_p.edid_raw_data;
> > +
> > + if (edid->mfg_id[0] == IVO_MID0 && edid->mfg_id[1] == IVO_MID1)
> > + return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > + MIPI_DIGITAL_ADJ_1, 0x3B);
> > +
> > + return anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > + MIPI_DIGITAL_ADJ_1, 0x3D);
> > +}
> > +
> > static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
> > {
> > struct device *dev = &ctx->client->dev;
> > @@ -470,9 +482,8 @@ static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
> > MIPI_PLL_N_NUM_15_8, (n >> 8) & 0xff);
> > ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client, MIPI_PLL_N_NUM_7_0,
> > (n & 0xff));
> > - /* Diff */
> > - ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > - MIPI_DIGITAL_ADJ_1, 0x3D);
> > + /* Diff and K value */
>
> With a proper comment above, this comment is no longer needed.
OK
>
> > + anx7625_set_k_value(ctx);
> >
> > ret |= anx7625_odfc_config(ctx, post_divider - 1);
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
> > index 034c3840028f..6dcf64c703f9 100644
> > --- a/drivers/gpu/drm/bridge/analogix/anx7625.h
> > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
> > @@ -210,7 +210,9 @@
> > #define MIPI_VIDEO_STABLE_CNT 0x0A
> >
> > #define MIPI_LANE_CTRL_10 0x0F
> > -#define MIPI_DIGITAL_ADJ_1 0x1B
> > +#define MIPI_DIGITAL_ADJ_1 0x1B
> > +#define IVO_MID0 0x26
> > +#define IVO_MID1 0xCF
> >
> > #define MIPI_PLL_M_NUM_23_16 0x1E
> > #define MIPI_PLL_M_NUM_15_8 0x1F
> > --
> > 2.25.1
> >
>
> LGTM with the above fix.
>
> Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
