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SubjectRe: [PATCH] drm/bridge/tc358775: Fixes bus formats read
Hi Vinay,

Thank you for the patch.

On Wed, Aug 12, 2020 at 12:55:50PM +0530, Vinay Simha BN wrote:
> - bus formats read from drm_bridge_state.output_bus_cfg.format
> and .atomic_get_input_bus_fmts() instead of connector
>
> Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
>
> ---
> v1:
> * Laurent Pinchart review comments incorporated
> drm_bridge_state.output_bus_cfg.format
> instead of connector
> ---
> drivers/gpu/drm/bridge/tc358775.c | 76 ++++++++++++++++++++++++++++++---------
> 1 file changed, 59 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> index 7da15cd..5d8714a 100644
> --- a/drivers/gpu/drm/bridge/tc358775.c
> +++ b/drivers/gpu/drm/bridge/tc358775.c
> @@ -271,6 +271,13 @@ struct tc_data {
> struct gpio_desc *stby_gpio;
> u8 lvds_link; /* single-link or dual-link */
> u8 bpc;
> + u32 output_bus_fmt;
> +};
> +
> +static const u32 tc_lvds_out_bus_fmts[] = {
> + MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
> + MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
> + MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
> };
>
> static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> @@ -359,19 +366,6 @@ static void d2l_write(struct i2c_client *i2c, u16 addr, u32 val)
> ret, addr);
> }
>
> -/* helper function to access bus_formats */
> -static struct drm_connector *get_connector(struct drm_encoder *encoder)
> -{
> - struct drm_device *dev = encoder->dev;
> - struct drm_connector *connector;
> -
> - list_for_each_entry(connector, &dev->mode_config.connector_list, head)
> - if (connector->encoder == encoder)
> - return connector;
> -
> - return NULL;
> -}
> -
> static void tc_bridge_enable(struct drm_bridge *bridge)
> {
> struct tc_data *tc = bridge_to_tc(bridge);
> @@ -380,7 +374,6 @@ static void tc_bridge_enable(struct drm_bridge *bridge)
> u32 val = 0;
> u16 dsiclk, clkdiv, byteclk, t1, t2, t3, vsdelay;
> struct drm_display_mode *mode;
> - struct drm_connector *connector = get_connector(bridge->encoder);
>
> mode = &bridge->encoder->crtc->state->adjusted_mode;
>
> @@ -451,14 +444,13 @@ static void tc_bridge_enable(struct drm_bridge *bridge)
> d2l_write(tc->i2c, LVPHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_ND(6));
>
> dev_dbg(tc->dev, "bus_formats %04x bpc %d\n",
> - connector->display_info.bus_formats[0],
> + tc->output_bus_fmt,
> tc->bpc);
> /*
> * Default hardware register settings of tc358775 configured
> * with MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA jeida-24 format
> */
> - if (connector->display_info.bus_formats[0] ==
> - MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) {
> + if (tc->output_bus_fmt == MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) {
> /* VESA-24 */
> d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
> d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0));
> @@ -590,6 +582,51 @@ static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> return 0;
> }
>
> +static int tc_bridge_atomic_check(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct tc_data *tc = bridge_to_tc(bridge);
> +
> + tc->output_bus_fmt = bridge_state->output_bus_cfg.format;

.atomic_check() isn't allowed to modify the device state, neither the
hardware state nor the software state in drm_bridge or tc_data. You can
instead access the bridge state directly in tc_bridge_enable(), with

struct drm_bridge_state *state =
drm_priv_to_bridge_state(bridge->base.state);

> +
> + dev_dbg(tc->dev, "output_bus_fmt %04x\n", tc->output_bus_fmt);
> +
> + return 0;
> +}
> +
> +static u32 *
> +tc_bridge_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)
> +{
> + u32 *input_fmts = NULL;
> + int i;

i only takes positive values, so it can be an unsigned int.

> +
> + *num_input_fmts = 0;
> +
> + for (i = 0 ; i < ARRAY_SIZE(tc_lvds_out_bus_fmts) ; ++i) {
> + if (output_fmt == tc_lvds_out_bus_fmts[i]) {
> + *num_input_fmts = 1;
> + input_fmts = kcalloc(*num_input_fmts,
> + sizeof(*input_fmts),
> + GFP_KERNEL);
> + if (!input_fmts)
> + return NULL;
> +
> + input_fmts[0] = output_fmt;

I don't think this is right, the input of the bridge isn't LVDS, is it ?
As far as I can tell, the hardware support transcoding any of the
supported input formats (RGB565, RGB666 or RGB888) to any of the
supported output formats. How about the following ?

static const u32 tc_lvds_in_bus_fmts[] = {
MEDIA_BUS_FMT_RGB565_1X16,
MEDIA_BUS_FMT_RGB666_1X18,
MEDIA_BUS_FMT_RBG888_1X24,
};

...

u32 *input_fmts;
unsigned int i;

*num_input_fmts = 0;

for (i = 0 ; i < ARRAY_SIZE(tc_lvds_out_bus_fmts) ; ++i) {
if (output_fmt == tc_lvds_out_bus_fmts[i])
break;
}

if (i == ARRAY_SIZE(tc_lvds_out_bus_fmts))
return NULL;

input_fmts = kcalloc(*num_input_fmts, ARRAY_SIZE(tc_lvds_in_bus_fmts),
GFP_KERNEL);
if (!input_fmts)
return NULL;

for (i = 0; i < ARRAY_SIZE(tc_lvds_in_bus_fmts); ++i)
input_fmts[i] = tc_lvds_in_bus_fmts[i];

*num_inputs_fmts = ARRAY_SIZE(tc_lvds_in_bus_fmts);
return input_fmts;

> +
> + break;
> + }
> + }
> +
> + return input_fmts;
> +}
> +
> static int tc_bridge_attach(struct drm_bridge *bridge,
> enum drm_bridge_attach_flags flags)
> {
> @@ -639,6 +676,11 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
> }
>
> static const struct drm_bridge_funcs tc_bridge_funcs = {
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_get_input_bus_fmts = tc_bridge_get_input_bus_fmts,
> + .atomic_check = tc_bridge_atomic_check,
> .attach = tc_bridge_attach,
> .pre_enable = tc_bridge_pre_enable,
> .enable = tc_bridge_enable,

--
Regards,

Laurent Pinchart

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