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drm/bridge: tc358768: Fix DSI command tx

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Wait for the command transmission to be completed in the DSI transfer
function polling for the dc_start bit to go back to idle state after the
transmission is started.

This is documented in the datasheet and failures to do so lead to
commands corruption.

Fixes: ff1ca6397b ("drm/bridge: Add tc358768 driver")
Cc: stable@vger.kernel.org
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240926141246.48282-1-francesco@dolcini.it
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240926141246.48282-1-francesco@dolcini.it
This commit is contained in:
Francesco Dolcini 2024-09-26 16:12:46 +02:00 committed by Neil Armstrong
parent 93d1f41a82
commit 32c4514455
1 changed files with 19 additions and 2 deletions
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21
drivers/gpu/drm/bridge/tc358768.c
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@ -125,6 +125,9 @@
#define TC358768_DSI_CONFW_MODE_CLR (6 << 29)
#define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (0x3 << 24)
/* TC358768_DSICMD_TX (0x0600) register */
#define TC358768_DSI_CMDTX_DC_START BIT(0)
static const char * const tc358768_supplies[] = {
"vddc", "vddmipi", "vddio"
};
@ -229,6 +232,21 @@ static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
tc358768_write(priv, reg, tmp);
}
static void tc358768_dsicmd_tx(struct tc358768_priv *priv)
{
u32 val;
/* start transfer */
tc358768_write(priv, TC358768_DSICMD_TX, TC358768_DSI_CMDTX_DC_START);
if (priv->error)
return;
/* wait transfer completion */
priv->error = regmap_read_poll_timeout(priv->regmap, TC358768_DSICMD_TX, val,
(val & TC358768_DSI_CMDTX_DC_START) == 0,
100, 100000);
}
static int tc358768_sw_reset(struct tc358768_priv *priv)
{
/* Assert Reset */
@ -516,8 +534,7 @@ static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
}
}
/* start transfer */
tc358768_write(priv, TC358768_DSICMD_TX, 1);
tc358768_dsicmd_tx(priv);
ret = tc358768_clear_error(priv);
if (ret)