linux-kernel - [PATCH v2 03/27] spi: amd: Support per spi-mem operation frequency switches

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241224-winbond-6-11-rc1-quad-support-v2-3-ad218dbc406f@bootlin.com>
Date: Tue, 24 Dec 2024 18:05:48 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Mark Brown <broonie@...nel.org>, Sanjay R Mehta <sanju.mehta@....com>, 
 Serge Semin <fancer.lancer@...il.com>, Han Xu <han.xu@....com>, 
 Conor Dooley <conor.dooley@...rochip.com>, 
 Daire McNamara <daire.mcnamara@...rochip.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Haibo Chen <haibo.chen@....com>, Yogesh Gaur <yogeshgaur.83@...il.com>, 
 Heiko Stuebner <heiko@...ech.de>, Michal Simek <michal.simek@....com>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Jacky Huang <ychuang3@...oton.com>, Shan-Chun Hung <schung@...oton.com>, 
 Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>, 
 Cédric Le Goater <clg@...d.org>, 
 Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>, 
 Avi Fishman <avifishman70@...il.com>, Tomer Maimon <tmaimon77@...il.com>, 
 Tali Perry <tali.perry1@...il.com>, Patrick Venture <venture@...gle.com>, 
 Nancy Yuen <yuenn@...gle.com>, Benjamin Fair <benjaminfair@...gle.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Raju Rangoju <Raju.Rangoju@....com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Steam Lin <stlin2@...bond.com>, linux-spi@...r.kernel.org, 
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 linux-mtd@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
 openbmc@...ts.ozlabs.org, linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH v2 03/27] spi: amd: Support per spi-mem operation frequency
 switches

Every ->exec_op() call correctly configures the spi bus speed to the
maximum allowed frequency for the memory using the constant spi default
parameter. Since we can now have per-operation constraints, let's use
the value that comes from the spi-mem operation structure instead. In
case there is no specific limitation for this operation, the default spi
device value will be given anyway.

This controller however performed a frequency check, which is also
observed during the ->check_op() phase.

The per-operation frequency capability is thus advertised to the spi-mem
core.

Cc: Sanjay R Mehta <sanju.mehta@....com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/spi/spi-amd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index d30a21b0b05f96fe5361d16a1fca3467260e0a08..485ae1e382e3eb8f4d72ebb0fb15c51b9a118d3b 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -479,6 +479,9 @@ static bool amd_spi_supports_op(struct spi_mem *mem,
 		return false;
 	}
 
+	if (op->max_freq < mem->spi->controller->min_speed_hz)
+		return false;
+
 	return spi_mem_default_supports_op(mem, op);
 }
 
@@ -676,7 +679,7 @@ static int amd_spi_exec_mem_op(struct spi_mem *mem,
 
 	amd_spi = spi_controller_get_devdata(mem->spi->controller);
 
-	ret = amd_set_spi_freq(amd_spi, mem->spi->max_speed_hz);
+	ret = amd_set_spi_freq(amd_spi, op->max_freq);
 	if (ret)
 		return ret;
 
@@ -705,6 +708,10 @@ static const struct spi_controller_mem_ops amd_spi_mem_ops = {
 	.supports_op = amd_spi_supports_op,
 };
 
+static const struct spi_controller_mem_caps amd_spi_mem_caps = {
+	.per_op_freq = true,
+};
+
 static int amd_spi_host_transfer(struct spi_controller *host,
 				   struct spi_message *msg)
 {
@@ -782,6 +789,7 @@ static int amd_spi_probe(struct platform_device *pdev)
 	host->setup = amd_spi_host_setup;
 	host->transfer_one_message = amd_spi_host_transfer;
 	host->mem_ops = &amd_spi_mem_ops;
+	host->mem_caps = &amd_spi_mem_caps;
 	host->max_transfer_size = amd_spi_max_transfer_size;
 	host->max_message_size = amd_spi_max_transfer_size;
 

-- 
2.47.0