Re: [PATCH v11 2/3] drm/bridge: imx: Add i.MX93 parallel display format configuration support

Marco Felsch
2026-03-03T21:22:43Z

On 26-03-03, Frank Li wrote:
> From: Frank Li (AI-BOT) <frank.li@nxp.com>
>
> AI bot review and may be useless.

Hi Frank,

albeit I'm very open to new technology, I would appreciate it if your
AI-BOT is used internally first till you're convinced that it reports
real issues instead of false-positives.

Regards,
Marco

> > +static u32 *
> > +imx93_pdfc_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
> > + struct drm_bridge_state *bridge_state,
> > + struct drm_crtc_state *crtc_state,
> > + struct drm_connector_state *conn_state,
> > + u32 output_fmt,
> > + unsigned int *num_input_fmts)
> > +{
> > + struct imx93_pdfc *pdfc = bridge_to_imx93_pdfc(bridge);
> > + u32 *input_fmts;
> > +
> > + *num_input_fmts = 0;
> > +
> > + input_fmts = kmalloc_obj(*input_fmts);
> > + if (!input_fmts)
> > + return NULL;
>
> Missing kfree(input_fmts) in error path if the switch statement
> or subsequent logic fails. Consider allocating a fixed-size array
> or using devm_kzalloc() instead.
>
> > + *num_input_fmts = 1;
> > +
> > + if (!imx93_pdfc_bus_output_fmt_supported(output_fmt)) {
> > + dev_dbg(pdfc->dev, "No valid output bus-fmt detected, fallback to MEDIA_BUS_FMT_RGB888_1X24\n");
>
> Line exceeds 80 characters (97 chars). Break into two lines.
>
> > + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
> > + return input_fmts;
> > + }
> > +
> > + switch (output_fmt) {
> > + case MEDIA_BUS_FMT_RGB888_1X24:
> > + case MEDIA_BUS_FMT_RGB565_1X16:
> > + input_fmts[0] = output_fmt;
> > + break;
> > + case MEDIA_BUS_FMT_RGB666_1X18:
> > + case MEDIA_BUS_FMT_FIXED:
> > + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
> > + break;
> > + }
>
> Switch statement lacks default case. Add default case to handle
> unexpected format values explicitly.
>
> > +static int imx93_pdfc_bridge_atomic_enable(struct drm_bridge *bridge,
> > + struct drm_atomic_state *state)
> > +{
> > + struct imx93_pdfc *pdfc = bridge_to_imx93_pdfc(bridge);
> > + const struct drm_bridge_state *bridge_state;
> > + unsigned int mask = PARALLEL_DISP_FORMAT;
> > + unsigned int val;
> > +
> > + bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
> > +
> > + switch (bridge_state->output_bus_cfg.format) {
> > + case MEDIA_BUS_FMT_RGB888_1X24:
> > + case MEDIA_BUS_FMT_FIXED:
> > + val = FORMAT_RGB888_TO_RGB888;
> > + if (pdfc->phy_bus_width == 18) {
> > + /*
> > + * Can be valid if physical bus limitation exists,
> > + * therefore use dev_dbg().
> > + */
> > + dev_dbg(pdfc->dev, "Truncate two LSBs from each color\n");
> > + val = FORMAT_RGB888_TO_RGB666;
> > + }
> > + break;
> > + case MEDIA_BUS_FMT_RGB666_1X18:
> > + val = FORMAT_RGB888_TO_RGB666;
> > +
>

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