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?
> +{
> + 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.
> + 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>
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