From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE638364A7; Fri, 24 Nov 2023 18:47:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="K1PS6iVi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4869DC433C8; Fri, 24 Nov 2023 18:47:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700851675; bh=fqn0WOWdg/x3A31UY4hKodgj7sBX+keOT53lv+mCgjw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K1PS6iViqaLC7+vTR9wYdcQ9Hls0W9BioDyfhy6igqPb1iqyU1aYQD5fRLA+qlvuJ yS3Qir7RazHhnOuUrWKLbu9l9bC76xx143RM9o5RK+kiZgLL7dDd0kGseLTYbWrn07 dUo0ohwb6qjx0Wldd4FOW60BYtw8pzKb5Ka4qx34= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ondrej Jirman , Frank Oltmanns , Samuel Holland , =?UTF-8?q?Guido=20G=C3=BCnther?= , Sasha Levin Subject: [PATCH 6.1 050/372] drm/panel: st7703: Pick different reset sequence Date: Fri, 24 Nov 2023 17:47:17 +0000 Message-ID: <20231124172012.148015869@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231124172010.413667921@linuxfoundation.org> References: <20231124172010.413667921@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ondrej Jirman [ Upstream commit d12d635bb03c7cb4830acb641eb176ee9ff2aa89 ] Switching to a different reset sequence, enabling IOVCC before enabling VCC. There also needs to be a delay after enabling the supplies and before deasserting the reset. The datasheet specifies 1ms after the supplies reach the required voltage. Use 10-20ms to also give the power supplies some time to reach the required voltage, too. This fixes intermittent panel initialization failures and screen corruption during resume from sleep on panel xingbangda,xbd599 (e.g. used in PinePhone). Signed-off-by: Ondrej Jirman Signed-off-by: Frank Oltmanns Reported-by: Samuel Holland Reviewed-by: Guido Günther Tested-by: Guido Günther Signed-off-by: Guido Günther Link: https://patchwork.freedesktop.org/patch/msgid/20230211171748.36692-2-frank@oltmanns.dev Signed-off-by: Sasha Levin --- drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++--------- 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c index 86a472b01360b..b6e514aabe1d3 100644 --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c @@ -428,29 +428,30 @@ static int st7703_prepare(struct drm_panel *panel) return 0; dev_dbg(ctx->dev, "Resetting the panel\n"); - ret = regulator_enable(ctx->vcc); + gpiod_set_value_cansleep(ctx->reset_gpio, 1); + + ret = regulator_enable(ctx->iovcc); if (ret < 0) { - dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret); + dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); return ret; } - ret = regulator_enable(ctx->iovcc); + + ret = regulator_enable(ctx->vcc); if (ret < 0) { - dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); - goto disable_vcc; + dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret); + regulator_disable(ctx->iovcc); + return ret; } - gpiod_set_value_cansleep(ctx->reset_gpio, 1); - usleep_range(20, 40); + /* Give power supplies time to stabilize before deasserting reset. */ + usleep_range(10000, 20000); + gpiod_set_value_cansleep(ctx->reset_gpio, 0); - msleep(20); + usleep_range(15000, 20000); ctx->prepared = true; return 0; - -disable_vcc: - regulator_disable(ctx->vcc); - return ret; } static const u32 mantix_bus_formats[] = { -- 2.42.0