From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Suchanek Subject: [PATCH v3 04/13] spi: sunxi: expose maximum transfer size limit Date: 13 Jun 2016 17:46:50 -0000 Message-ID: <6962eec8da0b5255cafd7782bcc39ca19041c2b1.1465490774.git.hramrach@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-sunxi@googlegroups.com, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Maxime Ripard , Chen-Yu Tsai , Russell King , Mark Brown , Michal Suchanek , Arnd Bergmann , Olof Johansson , Krzysztof Kozlowski , Javier Martinez Canillas , Simon Horman , Sjoerd Simons , Thierry Reding , Alison Wang , Timo Sigurdsson , Jonathan Liu , Gerhard Bertelsmann , Priit Laes List-Id: devicetree@vger.kernel.org The sun4i spi hardware can trasfer at most 63 bytes of data without DMA support so report the limitation. Same for sun6i. Signed-off-by: Michal Suchanek --- drivers/spi/spi-sun4i.c | 6 ++++++ drivers/spi/spi-sun6i.c | 5 +++++ 2 files changed, 11 insertions(+) diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c index f2848b7..ba2b5c8 100644 --- a/drivers/spi/spi-sun4i.c +++ b/drivers/spi/spi-sun4i.c @@ -167,6 +167,11 @@ static void sun4i_spi_set_cs(struct spi_device *spi, bool enable) sun4i_spi_write(sspi, SUN4I_CTL_REG, reg); } +static size_t sun4i_spi_max_transfer_size(struct spi_device *spi) +{ + return SUN4I_FIFO_DEPTH - 1; +} + static int sun4i_spi_transfer_one(struct spi_master *master, struct spi_device *spi, struct spi_transfer *tfr) @@ -411,6 +416,7 @@ static int sun4i_spi_probe(struct platform_device *pdev) master->bits_per_word_mask = SPI_BPW_MASK(8); master->dev.of_node = pdev->dev.of_node; master->auto_runtime_pm = true; + master->max_transfer_size = sun4i_spi_max_transfer_size; sspi->hclk = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(sspi->hclk)) { diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c index 8f6be86..bc29a98 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -153,6 +153,10 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable) sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg); } +static size_t sun6i_spi_max_transfer_size(struct spi_device *spi) +{ + return SUN6I_FIFO_DEPTH - 1; +} static int sun6i_spi_transfer_one(struct spi_master *master, struct spi_device *spi, @@ -403,6 +407,7 @@ static int sun6i_spi_probe(struct platform_device *pdev) master->bits_per_word_mask = SPI_BPW_MASK(8); master->dev.of_node = pdev->dev.of_node; master->auto_runtime_pm = true; + master->max_transfer_size = sun6i_spi_max_transfer_size; sspi->hclk = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(sspi->hclk)) { -- 2.8.1