From: "Sascha Hauer" <s.hauer@pengutronix.de>
To: "Johannes Schneider" <johannes.schneider@leica-geosystems.com>
Cc: barebox@lists.infradead.org,
"Johannes Schneider" <johannes.schneider@leica-geosystems.com>
Subject: Re: [PATCH v1 7/7] mci: imx-esdhc: support DMA in the i.MX8M PBL eMMC loader
Date: Mon, 29 Jun 2026 13:40:21 +0000 [thread overview]
Message-ID: <E1weCDl-00000005ilx-2MEA@pty.whiteo.stw.pengutronix.de> (raw)
In-Reply-To: <20260627194324.2230643-7-johannes.schneider@leica-geosystems.com>
On 2026-06-27 19:43, Johannes Schneider wrote:
> The PBL eMMC loader was hardwired to PIO via esdhc_use_pio_mode(): IN_PBL
> forced PIO unconditionally. PIO is slow -- on an i.MX8MM board loading the
> ~1.6 MB next stage took ~559 ms; SDMA/ADMA2 do it in ~21 ms.
For proper DMA support you'll need memory synchronization in form of dma_map_*
or dma_sync_* helpers which we do not have in PBL. Without them it won't
work with MMU enabled. Have you tried enabling the MMU in the mean time? This
should give you decent performance even with PIO.
Sascha
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next prev parent reply other threads:[~2026-06-29 14:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-27 19:43 [PATCH v1 1/7] dma: make dma_mapping_error() NULL-safe Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 2/7] mci: sdhci: bail out on ADMA/transfer errors instead of hanging Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 3/7] mci: sdhci: honor BROKEN_ADMA_ZEROLEN_DESC / NO_ENDATTR_IN_NOPDESC quirks Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 4/7] mci: imx-esdhc: mark the uSDHC ADMA2 descriptor quirks Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 5/7] mci: imx-esdhc: support HS400 and HS400ES on i.MX8M Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 6/7] mci: imx-esdhc: make the transfer mode selectable (PIO/SDMA/ADMA2) Johannes Schneider
2026-06-27 19:43 ` [PATCH v1 7/7] mci: imx-esdhc: support DMA in the i.MX8M PBL eMMC loader Johannes Schneider
2026-06-29 13:40 ` Sascha Hauer [this message]
2026-06-30 9:22 ` SCHNEIDER Johannes
2026-07-02 7:54 ` Sascha Hauer
2026-07-04 12:42 ` SCHNEIDER Johannes
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