In DMA mode we have a maximum transfer size, past that the driver falls back to PIO (see the check at the top of pxa2xx_spi_transfer_one). Falling back to PIO for big transfers defeats the point of a dma engine, hence set the max transfer size to inform spi clients that they need to do something smarter.
This was uncovered by the drm_mipi_dbi spi panel code, which does large spi transfers, but stopped splitting them after:
commit e143364b4c1774f68e923a5a0bb0fca28ac25888 Author: Noralf Trønnes noralf@tronnes.org Date: Fri Jul 19 17:59:10 2019 +0200
drm/tinydrm: Remove tinydrm_spi_max_transfer_size()
After this commit the code relied on the spi core to split transfers into max dma-able blocks, which also papered over the PIO fallback issue.
Fix this by setting the overall max transfer size to the DMA limit, but only when the controller runs in DMA mode.
Fixes: e143364b4c17 ("drm/tinydrm: Remove tinydrm_spi_max_transfer_size()") Cc: Sam Ravnborg sam@ravnborg.org Cc: Noralf Trønnes noralf@tronnes.org Cc: Andy Shevchenko andriy.shevchenko@intel.com Reported-and-tested-by: Andy Shevchenko andriy.shevchenko@intel.com Cc: Daniel Mack daniel@zonque.org Cc: Haojian Zhuang haojian.zhuang@gmail.com Cc: Robert Jarzmik robert.jarzmik@free.fr Cc: Mark Brown broonie@kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-spi@vger.kernel.org Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch -- v2: Brown paper bag edition, it needs to be a function ... --- drivers/spi/spi-pxa2xx.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index bb6a14d1ab0f..068c21037679 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -1602,6 +1602,11 @@ static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller, return cs; }
+static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi) +{ + return MAX_DMA_LEN; +} + static int pxa2xx_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1707,6 +1712,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) } else { controller->can_dma = pxa2xx_spi_can_dma; controller->max_dma_len = MAX_DMA_LEN; + controller->max_transfer_size = + pxa2xx_spi_max_dma_transfer_size; } }